Surveyaan: Drone Survey & Mapping Solutions - Blog by SurveyGyaan by SurveyaanSurveyaan: Drone Survey & Mapping Solutions - Blog by SurveyGyaan by Surveyaanhttps://www.surveyaan.com/blogs/author/surveygyaan-by-surveyaanThu, 12 Mar 2026 22:57:20 +0530http://zoho.com/sites/<![CDATA[LiDAR Surveying and Drones: What is Lidar Drone Survey ?]]>https://www.surveyaan.com/blogs/post/lidar-surveying-and-drones-what-is-lidar-drone-survey

In the fast-evolving field of geospatial technology, LiDAR surveying using drones is transforming how we map, measure, and manage the Earth’s surface. Whether it’s infrastructure planning, surveying, mining, forestry, or topographic mapping — LiDAR-equipped UAVs (Unmanned Aerial Vehicles) are becoming indispensable tools for professionals across industries.

In this blog, we’ll explore what LiDAR drone surveying is, how it works, its benefits, applications, and why it is a game-changer for modern surveying.

Quick Question Before We Start:
Have you ever used a drone for work or fun?

What is LiDAR Surveying?

Imagine a technology that can see through trees, map ancient ruins, and even help self-driving cars navigate — that’s LiDAR!

LiDAR (Light Detection and Ranging) is a remote sensing technology that uses laser pulses to measure distances. These pulses are emitted from a LiDAR sensor, bounce off surfaces, and return to the sensor, allowing it to calculate the precise distance between the object and the sensor. When mounted on a drone, LiDAR can collect millions of points per second — creating highly accurate 3D point clouds of terrain and structures. LIDAR is an ideal system for a variety of industries, including the civil engineering, roadwork and mining industries.

What is a LiDAR Drone?

It is simply a UAV (Unmanned Aerial Vehicle) equipped with a LiDAR (Light Detection and Ranging) sensor.

How Does LiDAR Drone Technology Work?

    1. Laser Pulses: The LiDAR sensor sends out rapid laser pulses — often hundreds of thousands per second.
    2. Return Signal: The laser hits a surface (ground, building, tree) and reflects back to the sensor.
    3. Distance Calculation: The time it takes for the laser to return is used to calculate the exact distance.
    4. 3D Model Creation: Combining all these points, software generates highly detailed 3D maps, called point clouds.

  1. This process allows surveyors to generate accurate Digital Elevation Models (DEMs), Digital Terrain Models (DTMs), and Digital Surface Models (DSMs).

Why Use a LiDAR Drone?

      Highly Accurate

      LiDAR drones can produce centimeter-level accuracy, making them ideal for topographic surveys, construction planning, and engineering projects.

      Vegetation Penetration

      Unlike cameras, LiDAR lasers can penetrate vegetation, allowing you to see the ground beneath trees and brush — crucial for forestry, archaeology, and environmental monitoring.

      Faster Data Collection

      Drone-based LiDAR surveys can cover large areas quickly — reducing time, labor, and cost compared to ground-based methods.

      Safe and Remote Access

      LiDAR drones can access steep, dangerous, or remote areas, reducing risk for field crews.

Think About It:
If LiDAR can “see through” foliage, where else could it be useful?

🌳 Forestry

🏗 Construction sites

🏛 Archaeology

Real-World Applications

Construction & Engineering

  No more guesswork! LiDAR drones create ultra-precise 3D models of construction sites.

  Cut costs by tracking stockpile volumes automatically.

Smart Farming

  Monitor crop health by scanning fields in minutes.

  Optimize irrigation with detailed elevation maps.

Mining & Quarries

  Measure stockpiles without climbing dangerous piles.

  Detect slope instability before collapses happen.

Forestry & Environment

  Count trees and estimate timber volume.

  Track deforestation with millimeter-level accuracy.

Did You Know?
LiDAR helped discover lost Mayan cities hidden under thick jungle!

Challenges & Limitations

High Initial Costs: Professional LiDAR drones cost $20,000–$100,000+.

Data Processing Complexity: Requires specialized software & expertise.

Regulatory Restrictions: Airspace regulations limit drone operations in urban areas.

Battery Life Constraints: Most drones have 20–40 min flight times, requiring multiple sorties.

LiDAR-equipped drones are transforming surveying by providing fast, accurate, and cost-effective geospatial data. Whether for construction, agriculture, mining, or urban planning, this technology enhances efficiency and decision-making.

This brings us to the end of the blog. I hope this article gained some knowledge for you!


Thank you for reading.

About SurveyGyaan


SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveypod specializes in DGNSS/DGPS manufacturing in INDIA.


Surveypod: www.surveypod.in


Surveyaan: www.surveyaan.com

]]>Wed, 02 Jul 2025 12:07:46 +0000<![CDATA[How DGNSS and Drone Surveying are Revolutionizing Land Surveying and Mining Industry]]>https://www.surveyaan.com/blogs/post/How-DGNSS-and-Drone-Surveying-are-Revolutionizing-Land-Surveying-and-Mining-Industry

When it comes to land surveying, accuracy and efficiency aren’t just nice to have — they’re everything. Whether you’re building roads, planning a mining site, or laying railway tracks, precision in your data collection is what lays the foundation for success. Enter DGNSS (Differential Global Navigation Satellite System) and drone-based surveying — two technologies that are transforming how surveyors and civil engineers work on the ground.

In this blog, we’ll break down what DGNSS and drone surveying are, how they work together, and why industries like mining, construction, road and railway departments are shifting to these modern tools.

What is DGNSS & Why Does It Matter for Drone Surveys? 

DGNSS = Differential GNSS (Global Navigation Satellite System)

Unlike standard GPS (which can have 5–10m errors), DGNSS corrects satellite signals using:

    A base station (on a known coordinate)

    A rover (drone/RTK receiver)

This brings accuracy down to 1–2 cm — critical for engineering-grade surveys.

Two Flavors of DGNSS:

    RTK (Real-Time Kinematic) — Corrections sent live to the drone (best for real-time mapping).

    PPK (Post-Processed Kinematic) — Data corrected later using software (more reliable in areas with poor                         connectivity).

    Fun Fact: Our SurveyPod DGNSS supports both RTK & PPK, so you’re covered in any terrain.

What is Drone Surveying?

Drone surveying uses UAVs (Unmanned Aerial Vehicles) equipped with high-resolution cameras or LiDAR sensors to capture aerial data over large areas. Instead of spending days walking the terrain with a total station, drones can cover 60 hectares in one flight — in just minutes.

Why Drones Make Sense:

  • Speed: Quick data capture means faster project planning.
  • Safety: No need to send people into dangerous or inaccessible areas.
  • Coverage: Large areas can be surveyed in a single flight.
  • Accuracy: With GNSS correction, drone data is incredibly precise.

    Fun Fact: Our Surveyaan V1 drone is a compact, sub-2kg UAV perfect for this.

How DGNSS and Drone Surveying Work Together

Here’s where it gets interesting. Drone surveying becomes exponentially more powerful when paired with DGNSS. With a GNSS base station providing corrections, you can geo-tag aerial images with high-accuracy coordinates, enabling:
  • Accurate orthomosaic/orthophotos, dsm/dtm, point clouds
  • Precise 3D and 2D models
  • Reliable contour and elevation data
For instance, in a road widening project, you could:

Who’s Using This Technology?

Industries already adopting UAVs + DGNSS surveys include:
    • Civil engineers & Surveyors: For land survey, topographic surveys, aerial maps and more.
    • Mining departments: For volume calculations, pit mapping, and safety monitoring.
    • Highway & Road departments: For route alignment, site inspection, and project monitoring.
    • Railway departments: For corridor mapping and encroachment analysis.
    • Infrastructure companies: For project planning, reporting, and audit documentation.

In a world where projects are bigger, timelines are tighter, and accuracy is non-negotiable, DGNSS and Drone surveying are not just buzzwords — they’re becoming the new standard. Whether you’re surveying a quarry, planning a bridge, or laying down a new railway line, combining these two technologies can save time, cut costs, and boost reliability

If you’re curious to explore how modern tools can help your team, check out our Surveypod DGNSS receiver and Surveyaan V1 drone — designed and built for real-world survey professionals like you.

]]>Wed, 02 Jul 2025 10:44:52 +0000<![CDATA[Mastering Tilt Compensation in DGNSS: Why It’s a Must-Know for Today’s Surveyors]]>https://www.surveyaan.com/blogs/post/mastering-tilt-compensation-in-dgnss-why-it-s-a-must-know-for-today-s-surveyors

Surveying is built on precision. A few centimeters can make or break a boundary line, construction layout, or mining volume calculation. Traditionally, Differential GNSS (DGNS) receivers required the pole to be held perfectly vertical to ensure accuracy. But in real-world environments — uneven terrain, obstructed areas, or busy sites — that’s not always feasible.

The Traditional Challenge
​Traditionally, achieving high accuracy with GNSS required meticulous leveling of the receiver pole. Any deviation from vertical introduced errors in the measured horizontal position. Surveyors had to constantly adjust the pole using levels and tripods, which could be slow and frustrating, particularly when:
    1. Working on uneven ground.
    2. Measuring points in hard-to-reach locations like building corners or under obstructions.
    3. Conducting large-scale surveys requiring numerous measurements.
This need for constant leveling not only reduced productivity but also increased the physical strain on surveyors.

What Is DGNSS Tilt Compensation?

Tilt compensation allows a GNSS receiver to accurately record positions even when the pole is not held vertically. This is made possible by integrating sensors like IMUs (Inertial Measurement Units) into the receiver, which calculate the tilt angle and correct the final coordinate accordingly.


Instead of worrying about bubble levels or perfect posture, the system does the math for you — making your workflow faster, easier, and safer.

How Does DGNSS Tilt Compensation Work?

When tilt compensation is enabled, the DGNSS receiver continuously monitors its tilt angle and direction. Combined with the GNSS positioning data and the known height of the pole, the system uses trigonometric calculations to determine the true horizontal position of the point being measured. This eliminates the need for the user to meticulously level the pole for each measurement, significantly increasing efficiency and ease of use.

Why Tilt Compensation Matters

  1. Faster Surveys: No need to spend time leveling the pole before every measurement. Tilt-compensated receivers allow for faster point collection, especially in high-volume or rugged environments. Measurements can be taken much faster as there is no need to level the pole precisely. Some manufacturers claim up to a 20% increase in point measurement efficiency and a 30% improvement in stakeout productivity.
  2. Safer Data Collection: In areas like open-pit mines or construction sites, it’s not always safe or practical to reach the exact location of a point. Tilt compensation enables surveyors to collect data from a safe distance while maintaining accuracy.
  3. Improved Accuracy on Slopes and Obstacles: Surveying in sloped or obstructed areas is much easier with tilt compensation, reducing both human error and the time spent re-collecting points.
  4. Reduced Fatigue: The physical strain of trying to keep the pole perfectly vertical for extended periods is reduced.
  5. Calibration-Free Options: Some advanced systems with IMUs offer calibration-free tilt compensation, making them ready to use immediately.

Why Tilt Compensation Matters

Whether you’re a beginner or a seasoned surveyor, tilt-enabled DGNSS can improve your workflow in many environments:

  • Mining: Safely survey benches and edges without going right to the edge
  • Construction: Quickly map out features like corners, manholes, or rebar points
  • Urban Surveying: Reach tight spots near fences, walls, or parked vehicles
  • Agriculture: Handle sloped fields without worrying about pole leveling

Is Tilt Compensation Accurate?

Yes — and then some. High-quality DGNS receivers with calibrated IMUs can provide centimeter-level accuracy even when tilted up to 60°. Of course, performance depends on sensor quality, GNSS signal strength, and environmental factors — but for most professional tasks, tilt compensation is not only sufficient — it’s essential.

Tilt Is the Future of Efficient Surveying

Tilt compensation isn’t a luxury feature anymore — it’s becoming a standard expectation in professional GNSS systems. By reducing physical strain, increasing safety, and speeding up workflows, it empowers surveyors to work smarter and safer.


Tilt compensation has revolutionized field surveying by improving safety, speed, and flexibility — without sacrificing accuracy. With devices like the SurveyPod DGNSS, surveyors can now handle complex environments more confidently and efficiently.


If you’re still leveling your pole manually at every point, it might be time to experience the benefits of tilt for yourself.


This brings us to the end of the blog. I hope this article gained some knowledge for you!

Thank you for reading.


About SurveyGyaan

SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveypod specializes in DGNSS/DGPS manufacturing in INDIA.

Surveypod: www.surveypod.in


Surveyaan: www.surveyaan.com

]]>Wed, 02 Jul 2025 10:44:52 +0000<![CDATA[The Importance of IMU in GNSS: Enhancing Accuracy Reliability]]>https://www.surveyaan.com/blogs/post/the-importance-of-imu-in-gnss-enhancing-accuracy-and-reliabilityIn this blog, we’ll explore the importance of IMU in GNSS, how it enhances accuracy, and why it’s a game-changer for high-precision applications.]]>

Global Navigation Satellite Systems (GNSS) like GPS, GLONASS, Galileo, and BeiDou provide essential positioning data for navigation, surveying, and autonomous systems. However, GNSS signals can be disrupted by obstacles like buildings, tunnels, or dense foliage. This is where an Inertial Measurement Unit (IMU) becomes crucial.

In this blog, we’ll explore the importance of IMU in GNSS, how it enhances accuracy, and why it’s a game-changer for high-precision applications.

What is an IMU?

An Inertial Measurement Unit (IMU) is an electronic device that measures acceleration, angular rate, and sometimes magnetic field using a combination of accelerometers, gyroscopes, and magnetometers.


Key Components of an IMU:

  1. Accelerometers — Measure linear acceleration.
  2. Gyroscopes — Measure angular velocity (rotation).
  3. Magnetometers (optional) — Detect Earth’s magnetic field for heading reference.

IMU + GNSS: A Powerful Combination

GNSS provides accurate absolute positioning by triangulating signals from satellites. However, it has limitations, such as:

        Signal loss in urban canyons, forests, or tunnels

        Latency and lags in fast-moving environments

        Susceptibility to multipath errors

By integrating an IMU, GNSS receivers gain inertial data, which helps:

  1. Bridge signal gaps when satellites are temporarily lost
  2. Maintain positioning accuracy during high dynamic motion
  3. Provide smooth and continuous data streams even in GNSS-denied environments

Key Benefits of IMU in GNSS Systems


1. Improved Accuracy and Reliability : When GNSS signals degrade or drop, the IMU keeps tracking the position through dead reckoning, minimizing errors in output data. This is vital in drone surveying and autonomous systems. 

2.Real-Time Orientation and Attitude : IMU provides pitch, roll, and yaw data — crucial for accurate georeferencing of aerial imagery, especially in photogrammetry and LiDAR missions.

3. Integrated RTK : Real Time Kinematic (RTK) is a technique that uses a reference station (base) to provide corrections to the GNSS receiver, resulting in sub-centimeter level accuracy. Many GNSS IMU systems have integrated RTK capabilities, allowing for even higher accuracy navigation solutions.

4. Enhanced Mapping Precision : In applications like corridor mapping, road surveys, or construction monitoring, IMU ensures accurate heading and tilt correction, resulting in cleaner, more precise data.

Disadvantages of IMUs


The following are some of the disadvantages of IMUs:


1. It can drift over time : The accuracy of IMU measurements can degrade over time due to drift, which means that the IMU may slowly lose its ability to accurately measure the object’s orientation, velocity, and acceleration.

2.They are susceptible to noise : IMU measurements can also be affected by noise. This noise can come from various sources, such as vibrations, electromagnetic interference, and temperature changes.

3. Require calibration : IMUs typically require calibration to ensure that they are providing accurate measurements. This calibration process can be time-consuming and complex.

Applications Benefiting from GNSS + IMU Integration


1. Drone Mapping & Aerial Surveying : Ensures accurate image geotagging and stable flight control.

2.Mobile Mapping Systems : For land-based vehicles mapping roads or railways.

3. Autonomous Vehicles : Essential for navigation without full GNSS visibility.

4. Agriculture & Mining: Enables reliable operation in harsh and obstructed environments.

5. Marine Navigation : Stabilizes heading and pitch in wave-affected areas.


The integration of IMU with GNSS is critical for high-precision, reliable, and continuous positioning in dynamic and signal-challenged environments. Whether for autonomous systems, drones, or surveying, an IMU ensures that navigation remains accurate even when satellite signals are unavailable.


For industries requiring uninterrupted and precise positioning, a GNSS + IMU solution is indispensable.


This brings us to the end of the blog. I hope this article gained some knowledge for you!


Thank you for reading.


About SurveyGyaan


SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software.


Surveypod: www.surveypod.in (DGNSS Manufacturer Website)


Surveyaan: www.surveyaan.com (Drone Manufacturer Website)


Surveyaan Geoworkspace: app.surveyaan.com (Cloud Photogrammetry Software Website)


]]>Wed, 30 Apr 2025 11:17:09 +0000<![CDATA[How to apply UIN for Drones? A Complete Guide for Indian Drone Operators and Manufacturers]]>https://www.surveyaan.com/blogs/post/how-to-apply-uin-for-drones-a-complete-guide-for-indian-drone-operators-and-manufacturersLearn everything you need to know about obtaining a Unique Identification Number (UIN) for drones in India. This step-by-step guide covers drone categories, DGCA regulations, eligibility, application process via Digital Sky, and the importance of drone registration for safe and legal operations.]]>

Drones have become increasingly popular for recreational, commercial, and industrial purposes. However, with the rise in drone usage, regulatory bodies like the Directorate General of Civil Aviation (DGCA) in India have introduced strict guidelines to ensure safety and security. One such requirement is the Unique Identification Number (UIN) for drones.

In this blog, we’ll explore what a UIN is, why it’s necessary, and how drone operators can obtain one.

Drone Categories

  1. Nano Drones (≤ 250 grams) — Lightweight drones and need no license or registration.
  2. Micro Drones (251g — 2 kg) — Registration is required for commercial use.
  3. Small Drones (2 kg — 25 kg) — Registration is mandatory.
  4. Medium Drones (25 kg — 150 kg) — Because of the increased safety and privacy hazards associated with their size and prospective uses, operating medium is subject to tougher laws.
  5. Large Drones (>150 kg) — Because of the increased safety and privacy hazards associated with their size and prospective uses, operating large uavs is subject to tougher laws.

Figure 1: Drone Categories in India

What is UIN?

The Unique Identification Number (UIN) is a registration requirement for anyone looking to operate drones in India. The UIN number is a distinctive identifier for each drone. It functions like a license plate for vehicles linking it to the owner in official records. It is essential for ensuring accountability and facilitating easier regulation of drone activities.

Figure 2: Drone with UIN Number

Is UIN Mandatory for All Drones?


Not for all. Here’s the eligibility:


  • Nano Drones (≤250 grams): UIN is not required for non-commercial use.

    • Micro, Small, and Medium Drones (>250g to ≤150kg): UIN is mandatory.
    • Imported Drones or those without Type Certification cannot get a UIN and are not allowed to operate.

    Why is UIN Important?

    • Legal Compliance: Flying a drone without UIN (if required) is illegal and can lead to penalties.
    • Tracking & Safety: Helps authorities track drones in case of incidents or airspace violations.
    • Required for Permissions: To apply for any flight permissions via Digital Sky, a UIN is mandatory.
    • Proof of Ownership: Establishes rightful ownership and acts as drone identity.

    Step-by-Step Process to Register Your Drone

    Figure 3: Registering drone through DGCA website

      1. 1. Obtain a Digital Sky Account

              2. Apply for a Unique Identification Number (UIN)

      There are 2 ways to generate UIN Number.

      Apply UIN for cases exempted from Type Certificate (Model or a Nano UAS)

      • Organisations can create manufacturer account and profile on DigitalSky platform, if not already created.
      • Login to DigitalSky platform and Select ‘Add Exempted Model’ menu option from the dashboard
      • Fill all mandatory details of your Exempted UAS model and add your model on Digital Sky Platform
      • Once model is added, Individual/Organisation user can Add UAS Serial Number from dashboard, for the added UAS Model.
      • User can Click Apply for UIN for the added UAS serial number
      • Preview the Application for Registration of UIN, Pay ₹100 fee and Submit Form D-2 (Application for Unique Identification Number) Upon successful receipt of requisite fee, the UIN will be generated.

    1. Apply for UAS which is Type Certified model
      • Create your account and profile on Digital Sky platform, if not already created.
      • Login to Digital Sky platform and add your UAS Serial Number from dashboard.
      • Navigate to the list of UAS and Apply for UIN for the added UAS serial number
      • Preview the Application for Registration of UIN (Unique Identification Number)
      • Pay ₹100 fee and complete the submission of Form D-2 (Application for Unique Identification Number)
      • Upon successful receipt of requisite fee, the UIN will be generated.

    Flying Without UIN? Think Again.


    Using a drone without UIN (when it’s legally required) may lead to:

    • Heavy fines
    • Drone confiscation
    • Ban from flying operations

    Figure 4: Using a drone without UIN (when it’s legally required)

    Registering your drone in India is a simple but mandatory process to avoid legal issues. By following DGCA guidelines, you ensure safe and lawful drone operations.

    How to check if your done has UIN number?


    To check if your drone has a UIN (Unique Identification Number) in India, follow these steps:


    1. Check the Drone Surface

    Most drones with UINs issued by the DGCA have the UIN printed or affixed visibly on the base frame.

    It usually looks like: UXXXXXX.


    2. Log into the Digital Sky Platform
    Visit: https://digitalsky.dgca.gov.in

    Under Issued UINs tab you can search by either class/owner/model


    For Eg Surveyaan — a brand of Nibrus Technologies is a drone manufacturing company in India which has type certified models. Surveyaan have a drone model named Surveyaan V1. To check if any drones have UIN number you can search company name/model name in the search tab.

    Figure 5: UIN under DGCA

    This brings us to the end of the blog. I hope this article gained some knowledge for you!


    Thank you for reading.


    Thank you for reading.


    About SurveyGyaan


    SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software.


    Surveypod: www.surveypod.in (DGNSS Manufacturer Website)


    Surveyaan: www.surveyaan.com (Drone Manufacturer Website)


    Surveyaan Geoworkspace: app.surveyaan.com (Cloud Photogrammetry Software Website)


    ]]>    Thu, 10 Apr 2025 11:32:23 +0000    <![CDATA[Best Practices for DGNSS (Differential Global Navigation Satellite System)]]>https://www.surveyaan.com/blogs/post/best-practices-for-dgnss-differential-global-navigation-satellite-systemIn this blog, we outline essential best practices for DGNSS surveying, including how to set up your base and rover stations, prepare for field conditions, and choose the right positioning techniques (Static, RTK, PPK, or Rapid Static).]]>

    Systematic field procedures are part of any successful DGNSS survey that guarantees that data obtained is both accurate and reliable. Whether in terms of setting up base and rover stations or the field procedures and collection of data, the same case applies — best practices ensure results are both accurate and reliable. This blog will, therefore, be focusing on some of the most fundamental practices of successful DGNSS surveying.

    Pre-survey Preparations

              Ensure all your equipment is properly calibrated, batteries are charged, and software and firmware updates          are done before commencing the survey.

    • Check the weather forecast and satellite availability and any other factors that might cause interference or obstruction to the measurement, including buildings, trees, power lines, or radio signals. Also, prepare for any contingencies related to the malfunction of equipment, loss of data, and denial of access to the site of interest.
    • Locate memory devices (typically SD cards) and verify sufficient storage is available.
    • If not familiar with the gear, perform a full setup test, check that the communications are working correctly between devices before heading to the field, or be prepared to troubleshoot later.
    • If possible, investigate your field area. Topographic maps, Google Earth Imagery, or pre-trip to the area can dramatically increase your chances of success on your field day. Using this knowledge, plan the base sites, data points and paths to navigate the field site. A good plan will reduce time spent in the field later. Anticipate the number of points to be collected and time associated with the plan.
    • Pack all equipment using a checklist.


    In-Field Techniques

    • Stable and High Ground: Place the base station on stable, solid ground to ensure that it will stay in one place during the entire survey. Put the base station as high as practical. This minimizes multipath from the surrounding area and enables the radio broadcast to the maximum distance. Also, the higher the gain on the antenna, the longer the range.
    • Clear Sky View: Mount the base GPS antenna where there will be clear view of the sky in all directions. Not near vertical obstructions like buildings, deep cuttings, site vehicles, towers, tree canopy, etc. This is to ensure that the receiver do not have to deal with messy multi-path signals.
    • Check Base Station Regularly: Periodically check the base station to make sure it is functioning correctly and is transmitting data. Ensure that the base is monitored at all time as it can be stolen or knocked down by wind/animals.
    • Field Notes: Keeping detailed field notes of the survey, including possible problems or oddities observed in the course of surveying.
    • Data Quality Checks: Checking the quality of correction data received from time to time and verifying the positional accuracy obtained from the Rover that should be within the acceptable limits.
    • Safety Precautions: Observe precautions for personal safety, especially when working in the vicinity of live traffic, in remote areas, or in bad weather.
    • Known Coordinates: Use a location with known and accurate coordinates or establish the position of the base station by precise static observations.
    • Power Source: The GNSS receiver should never run out of power. The GNSS receiver has an internal battery that must be charged. Provide external power in order to use continuously for more than a day without losing power at the base station.
    • Electromagnetic Interference: Ensure that the base is away from heavy machinery, radio/mobile towers and overhead power lines as the electromagnetic fields associated with these utilities can interfere with the DGNSS signals.


    Data Collection Techniques

    Effective Effective data collection in a DGNSS survey involves various techniques to ensure precision and reliability. Here are key techniques for data collection during a DGNSS survey:data collection in a DGNSS survey involves various techniques to ensure precision and reliability. Here are key techniques for data collection during a DGNSS survey:


    Static Positioning
    Static positioning is a method in DGNSS (Differential Global Navigation Satellite System) surveys that involves collecting data at a fixed point over an extended period to achieve high-precision coordinates. This technique is particularly useful for establishing control points, base station locations, and other critical survey markers that require high accuracy.

    Picture 1: DGNSS set to Static Mode

    Rapid Static (Fast Static)

    Rapid static positioning, also known as fast static positioning, is a technique in DGNSS (Differential Global Navigation Satellite System) surveys that balances the accuracy of static positioning with the efficiency of kinematic methods. It involves shorter observation times than traditional static surveys, making it suitable for projects requiring quick and precise measurements at multiple points.

    Real-Time Kinematic (RTK) Surveying
    Real-Time Kinematic (RTK) is a high-precision positioning technique used in DGNSS (Differential Global Navigation Satellite System) surveys. RTK provides real-time corrections to the rover receiver, enabling centimeter-level accuracy. This technique is widely used in applications requiring immediate and precise positioning, such as construction, agriculture, and topographic surveys.

    Figure 2: The rover is getting real time corrected data from base

    Post-Processed Kinematic (PPK)
    Post-Processed Kinematic (PPK) is a technique in DGNSS (Differential Global Navigation Satellite System) that provides high-precision positioning by applying differential corrections after data collection. Unlike Real-Time Kinematic (RTK), PPK does not require real-time communication between the base and rover, making it suitable for areas with poor communication infrastructure.

    Figure 3: The rover is getting real time corrected data from base

    Adhering to best practices in DGNSS surveying is essential for achieving high-precision and reliable results. By meticulously setting up your base and rover stations, continuously monitoring signal quality, and carefully documenting field conditions, you can mitigate potential sources of error. Utilizing techniques like RTK, PPK, static, and rapid static positioning, each suited for specific scenarios, allows for flexibility and precision in various surveying contexts.

    This brings us to the end of the blog. I hope this article gained some knowledge for you!

    Thank you for reading.


    About SurveyGyaan


    SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software.


    Surveypod: www.surveypod.in (DGNSS Manufacturer Website)


    Surveyaan: www.surveyaan.com (Drone Manufacturer Website)


    Surveyaan Geoworkspace: app.surveyaan.com (Cloud Photogrammetry Software Website)



    ]]>    Thu, 10 Apr 2025 09:17:32 +0000    <![CDATA[How many Satellites and Channels require in your DGNSS?]]>https://www.surveyaan.com/blogs/post/how-many-satellites-and-channels-require-in-your-dgnssIn this blog, we break down one of the most persistent myths in the surveying industry: the belief that more channels in a DGNSS receiver automatically mean better performance.]]>

    In the realm of precision navigation and positioning, Differential GNSS (DGNSS) often emerges as a critical yet misunderstood technology. Despite its pivotal role in enhancing GPS accuracy, several myths persist, clouding its true value. Today, let’s discuss some common misconception in the survey world related to DGNSS (or DGPS).

    You may have heard people emphasize the importance of having 400, 800, or even 1200 channels in a DGNSS receiver. Have you ever thought deeper to understand what this actually means? Let’s clarify this with some simple mathematical calculations.

    There are a total of 120 operational satellites: GPS (31), Galileo (24), GLONASS (24), BeiDou (30), NavIC (7), and QZSS (4). These satellites are distributed across the orbital plane and are not all visible from a particular point on Earth.

    What is an Elevation Mask?


    An elevation mask is a threshold angle that defines the minimum elevation above the horizon that a satellite must have to be considered in the positioning calculations of a DGNSS receiver. The purpose of this mask is to filter out low-angle satellite signals that are more likely to be degraded by atmospheric interference, multipath effects, and obstructions.

    What value to keep for Elevation Mask?


    It is recommended to set the Elevation Mask to 15 degrees to use only high-quality satellites for positioning. However, even with an Elevation Mask set to 5 degrees, you wouldn’t be able to see even half of the satellites simultaneously.

    How many satellites with Elevation Mask as 5 degrees?


    With an Elevation Mask of 5 degrees, you would only be able to track a maximum of 14 GPS, 6 Galileo, 6 GLONASS, 11 BeiDou, and 4 QZSS satellites. Out of the 7 NavIC satellites, only 5 are operational, and many companies do not support NavIC.

    So how many Channels?


    Now, let’s talk about channels. The L1 and L2 bands require only one channel each, whereas the L5 band requires two channels. Interestingly, out of the 120 satellites, only 40–45 have L5 bands.

    Here’s the mathematical calculation with a 5-degree Elevation Mask (in general, if you set it to 15 degrees, which is the industry standard, the number would be lower):

    Total satellites being used: 14 (GPS) + 6 (Galileo) + 6 (GLONASS) + 11 (BeiDou) + 4 (QZSS) + 5 (NavIC) = 46 satellites. Not all of these would have L5 bands; let’s assume 20 do.

    So, the total number of channels required would be: 46*1 (L1) + 46*1 (L2) + 20*2 (L5) = 132 channels. In reality, this is still an exaggerated number. In the real world, no more than 100 channels are typically required. Claims of needing 400, 800, or even 1200 channels are overly futuristic and marketing/selling strategy. It will take more than 10–15 years to even approach the utilization of 300 channels.

    Does All Satellites Used in DGNSS Provide the Same Level of Accuracy?


    The accuracy of signals from GNSS satellites can vary due to several factors, including the satellite’s position, health, and atmospheric conditions affecting the signal’s travel to Earth. Differential GNSS (DGNSS) enhances overall accuracy by correcting these variable errors. However, the effectiveness of DGNSS corrections is influenced by the quality of the correction data, which depends on the proximity and condition of the reference station, as well as the quality of the communication link between the reference station and the DGNSS receiver. Therefore, it is crucial to closely examine the quality of the satellites being used for positioning.

    Thank you for reading.


    About SurveyGyaan


    SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software.


    Surveypod: www.surveypod.in (DGNSS Manufacturer Website)


    Surveyaan: www.surveyaan.com (Drone Manufacturer Website)


    Surveyaan Geoworkspace: app.surveyaan.com (Cloud Photogrammetry Software Website)

    ]]>    Thu, 10 Apr 2025 06:28:45 +0000    <![CDATA[DGNSS Series - CORS Network]]>https://www.surveyaan.com/blogs/post/cors-networkThe Continuous Operating Reference Station (CORS) networks positioning services are amongst the most used ones when the highest positioning accuracy is needed.]]>

    The way we monitor locations and travel on Earth has been completely transformed by global navigation satellite systems, or GNSS. These satellite constellations, which include GPS and Galileo, supply critical position data for a wide range of uses, from precise timing in financial transactions to automobile navigation systems. But in order to guarantee the highest level of location accuracy, obstacles including atmospheric delays and signal blockages must be overcome. Nowadays, the Continuous Operating Reference Station (CORS) networks positioning services are amongst the most used ones when the highest positioning accuracy is needed.

    Idea behind CORS Network

    In most of GNSS applications where precise positioning is required, users usually pair their GNSS instruments with other GNSS instruments, simultaneously observing one or more known position, termed as reference station, and with help of these reference stations estimated corrections to be applied over point of interest or rover position are obtained through Static GNSS Survey or Real Time-Kinematic (RTK) Survey methods.

    To liberate users from setting of their own reference station each time they wish to undertake GNSS measurement, Continuously Operating Reference Stations (CORS) has been established, which are not only capable of providing Real Time Positioning Service through RTK/NRTK with an accuracy of ±3cm, but also host an array of different positioning services targeted to cater requirements for different segments of Geospatial and scientific Community.

    What is CORS Network?

    CORS networks are permanently installed reference stations strategically positioned across a geographic region. These stations are equipped with high-precision GPS receivers and antennas that continuously collect and process GPS data to calculate position corrections. These corrections account for various factors that can affect signal accuracy, such as ionospheric and tropospheric delays, satellite orbit errors, and multipath interference. The data is then transmitted to a central processing facility where it is used to provide real-time, accurate positioning information for a variety of applications.

    Characteristics of CORS Network

    The CORS network is available 24 hours per day, 7 days a week and 365 days a year.

    • CORS stations are strategically distributed across a geographic region to provide comprehensive coverage.
    • The CORS network is a multi-purpose collaboration between government, academic, and corporate institutions. The sites are independently owned and operated.
    • CORS networks support multiple GNSS constellations, including GPS, GLONASS, Galileo, and BeiDou.
    • It is typically used to support a wide range of applications, including surveying and mapping, construction, transportation, and other industries.
    • Many CORS networks provide open access to their data, allowing users from various sectors to utilize positioning information for diverse applications.

    CORS in INDIA

    India has been actively developing and deploying its own CORS (Continuously Operating Reference Stations) network in conjunction with its regional satellite navigation system called NavIC (Navigation with Indian Constellation). NavIC, also known as the Indian Regional Navigation Satellite System (IRNSS), is a constellation of satellites developed by the Indian Space Research Organisation (ISRO) to provide accurate positioning and timing services over the Indian region and surrounding areas.

    How CORS network function in India using NavIC?

    • India has been establishing a network of CORS stations across the country. 
    • These CORS stations are equipped with high-precision GNSS receivers and antennas, allowing them to continuously monitor signals from both the NavIC satellites and other GNSS constellations such as GPS. 
    • The CORS stations collect raw GNSS measurements and transmit them to a central processing facility. At this facility, the raw data is processed using precise algorithms to compute corrections and augmentations for improving the accuracy of GNSS positioning. 
    • Since NavIC is India’s regional satellite navigation system, the CORS network integrates NavIC signals into its positioning solutions. This integration enhances the accuracy and availability of positioning data, especially in areas where NavIC signals have better visibility than signals from other GNSS constellations.

    The corrected GNSS data, including NavIC-based corrections, is made available to users in real-time through various means such as the internet, satellite communication, or radio links. This allows users to access accurate positioning information for their applications, including surveying, mapping, agriculture, transportation, and disaster management.

    CORS Network in India — Present 

    There are two types of Service being made available by Survey of India (SOI):

    1. Real Time Positioning Services (RTPS)

    •  Network RTK Services for 3–4 centimeter real time positioning.
    •  D-GNSS Services for 30–40 centimeter accurate real time positioning.

    2. Reference Data Services (RDS)

    •  Online Data processing of static observation with respect of CORS.
    •  Downloading of RAW Data of CORS Stations for processing in user software.

    For more precise or scientific applications users can download CORS stations raw observations in non proprietary open RINEX format or virtual rinex data (i.e. RINEX files for a virtual reference station that can then be used for post processing calculations), and use it to process his own GNSS data it his own software. 


    For accessing all these services users are required to get registered themselves on Survey of India CORS web site, i.e. http://www.cors.surveofindia.gov.in


    About SurveyGyaan


    SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software.

    Surveyaan (Indian Drone Manufacturers): www.surveyaan.com

    Surveyaan GeoWorkspace (Photogrammetry Software): app.surveyaan.com


    ]]>    Fri, 09 Feb 2024 08:22:14 +0000    <![CDATA[DGNSS Series - Real Time Kinematic (RTK) and Post Processing Kinematic (PPK)]]>https://www.surveyaan.com/blogs/post/real-time-kinematic-rtk-and-post-processing-kinematic-ppkGlobal Navigation Satellite System (GNSS) technology has transformed how we navigate and collect location-based data]]>

    Global Navigation Satellite System (GNSS) technology has transformed how we navigate and collect location-based data. Real-Time Kinematic (RTK) and Post-Processing Kinematic (PPK) are two cutting-edge methodologies that have greatly improved the accuracy and dependability of GNSS data. In this blog article, we’ll look at the concepts, uses, and benefits of RTK and PPK GNSS technology.


    RTK and PPK are techniques used to enhance the accuracy of GNSS measurements:

    Real Time Kinematics

    This form of measurement occurs when we have a GNSS base that communicates directly with the GNSS rover and delivers corrections via radio transmission. In this approach, both the base and the rover get signals from the same satellites and through this direct radio link the corrections are transmitted in real time, achieving a high accuracy in the same field of data capture.

    Pros of Real Time Kinematics

    • Accuracy: RTK GNSS offers centimeter-level precision, making it ideal for applications requiring accurate location, such as surveying, construction, and agriculture.
    • Real-Time Corrections: RTK applies corrections to the GNSS signal in real time, allowing users to acquire precise location data in a fraction of seconds. This capability is especially useful for applications requiring fast input or change, such as machine control in construction.
    • Increased Efficiency: RTK technology allows for quicker data collecting and decision-making processes, which improves efficiency in a variety of applications. Surveyors, for example, may conduct fieldwork more rapidly with RTK, resulting in shorter project schedules.
    • Versatility: RTK GNSS may be used in a wide range of settings and situations, from metropolitan regions with tall structures to broad open fields. Its adaptability makes it appropriate.

    Cons of Real Time Kinematics

    • Line-of-Sight Requirements: RTK GNSS requires a clear line of sight between the receiver and the satellites. Signal barriers, such as buildings, trees, or topography, might reduce performance and accuracy.
    • Reliance on Base Station: RTK systems rely on a nearby base station to send correction data to the rover receiver. This reliance restricts the range of operation and may be impractical in distant or inaccessible places without a network of base stations.
    • Vulnerability to Signal Interference: RTK GNSS signals are vulnerable to interference from sources such as electromagnetic interference (EMI), multipath reflections, and atmospheric conditions. Interference can impair signal reception and reduce accuracy, particularly in urban or industrial settings.
    • Infrastructure costs: Setting up and maintaining RTK infrastructure, including base stations and communication networks, may be expensive, especially for large-scale projects or businesses with several locations. Furthermore, continuous subscription costs for correction services may increase the overall cost of RTK GNSS use.

    Post Processing Kinematics

    PPK is an alternative to RTK that applies positional corrections retrospectively. This means that in PPK mode, the GNSS rover and GNSS base station do not need to be connected when functioning. You simply need to record raw GNSS data (logs), which are subsequently processed to produce accurate positioning data that may be utilized for computations in postprocessing.

    Post-Processing Kinematic (PPK) GNSS technology offers unique advantages.

    Pros of Post Processing Kinematics

    • High Accuracy:Similar to RTK, PPK GNSS provides centimeter-level accuracy, ensuring precise positioning data for various applications such as surveying, mapping, and asset management.
    • Flexibility in Data Collection:PPK technology allows users to collect GNSS data without the need for a real-time correction source or continuous communication with a base station. This flexibility is advantageous in remote or challenging environments where real-time corrections may not be available.
    • Cost savings: With PPK GNSS, there are no continuing subscription fees or infrastructure expenditures connected with real-time correction services. This can result in cost savings over time, particularly for firms that do regular or large-scale GNSS surveys.

    Cons of Post Processing Kinematics

    • Delayed Results:Unlike RTK, which gives real-time positioning data, PPK GNSS requires gathered data to be post-processed in order to make corrections and obtain precise results. Depending on the processing procedure and software utilized, this could cause delays in receiving final positioning data.
    • Post-processing Complexity: To use PPK GNSS, users must acquire raw GNSS data in the field and process it using specific software or algorithms. This procedure can be difficult and may necessitate training or experience to provide correct findings.
    • Limited Real-Time Feedback:Without real-time corrections, users cannot discover and correct positional errors or anomalies during data gathering with PPK GNSS. Additional field checks or validation procedures may be required to verify data quality before results are finalized.

    RTK and PPK GNSS technologies have transformed the landscape of precise positioning, enabling a wide range of industries to achieve unprecedented levels of accuracy in their location-based applications. As advancements in GNSS technology continue, the future holds even greater promise for enhanced accuracy and efficiency across diverse industries.

    Thank you for reading.


    About SurveyGyaan


    SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software.


    Surveypod: www.surveypod.in (DGNSS Manufacturer Website)


    Surveyaan: www.surveyaan.com (Drone Manufacturer Website)


    Surveyaan Geoworkspace: app.surveyaan.com (Cloud Photogrammetry Software Website)

    ]]>    Fri, 02 Feb 2024 12:37:33 +0000    <![CDATA[DGNSS Series-Base and Rover]]>https://www.surveyaan.com/blogs/post/dgnss-series-base-and-roverGlobal Navigation Satellite System (GNSS) technology has transformed how we navigate and collect geospatial data.]]>

    Global Navigation Satellite System (GNSS) technology has transformed how we navigate and collect geospatial data. The Base and Rover stations are critical components of GNSS systems, as they provide accurate location data. In this blog article, we will look at the fundamentals of Base and Rover in GNSS, including their functions, interactions, and significance in various applications

    Base Station

    The Base Station is a fixed point in the GNSS network that acts as a reference for the entire system. It is also known as Reference Station. The base is usually placed in a known location with precisely measured coordinates. The location is pre-surveyed by either traditional methods or by GNSS observation for multiple days. This known position acts as a reference point against which the Rover’s position is determined.

    The primary function of the base is that it serves as an anchor for calculating accurate positions by comparing the signals received from multiple satellites. The Base-station then provides error data for every observation compared to it’s known location.

    Key Features of Base

    Stability and Accuracy: It serves as a reference station that provides essential information for real-time positioning and data collection ensuring stability and precision in determining positions.

    Continuous Operation: By continuously receiving signals from multiple satellites, it gives a steady reference for Rovers in their range.

    Signal correction: It is yet another important feature provided by the base station. It receives signals from satellites and compares them with known reference points or models to identify any discrepancies or errors caused by factors like atmospheric interference or satellite clock errors.

    Data Transmission: Base Stations send correction data to Rovers, which compensate for mistakes caused by air conditions, satellite orbits, and other variables.

    Rover

    The Rover is a mobile machine outfitted with a GNSS receiver that receives signals from multiple satellites to determine its precise position on Earth. It is not fixed to a known place and calculates its accurate position using satellite signals and Base Station correction data.


    These are typically utilized when a surveyor wants to gather data, stakeout points, or create digital terrain models (DTM) on the building site. It is most commonly used for setting out property boundaries, gathering GPS data on the placement of cables, pipelines, and sewage drains, which is then exported via .DXF files into your AutoCAD system. In addition to rovers pinpointing exact areas, they are instrumental in measuring stockpiles and topsoil piles. They can also be used to establish Ground Control Points (GCP) for drone surveying. Tilt sensors are now standard on later versions. These also let you to slant your receiver pole, making more challenging situations accessible.

    Key Features of Rover

    Portability: Rovers are meant to be portable, making them useful for a variety of purposes including surveying, agriculture, construction, and navigation.

    Real-time Positioning: The rover calculates its position by processing signals from GNSS satellites. To improve accuracy, it receives correction data from the base station.

    Dynamic Correction Reception: As the rover moves, it continuously receives correction signals from the base station. This dynamic correction ensures that the rover’s position remains accurate, even in changing environmental conditions.

    Base-Rover Interaction

    The key concept in the interaction between the base and rover is “differential correction.” The base station, having a known precise location, calculates the errors in the satellite signals it receives due to factors like atmospheric conditions and satellite clock errors. These error corrections are then transmitted to the rover in real-time (Real-Time Kinematic or RTK) or saved for post-processing. 

    • In RTK, corrections from the base station are transmitted in real-time to the rover, enabling centimeter-level positioning accuracy.
    • In post-processing, the data collected by both the base and rover are used after the survey is completed. The base’s precise location and the rover’s data are processed together to achieve high-precision results.

    The rover applies these corrections to its own GNSS data, significantly improving the accuracy of its position calculations.


    Communication between the base and rover is crucial for transmitting correction data. This communication can occur through radio links, cellular networks, or other wireless technologies, depending on the specific GNSS system in use.

    Applications

        Surveying and Mapping: GNSS technology with Base and Rover stations is widely used in land surveying          and mapping applications, providing accurate and efficient data collection.

        Precision Agriculture: Farmers use GNSS technology to optimize field operations, such as planting,         harvesting, and irrigation, leading to increased productivity and resource efficiency.

        Construction and Infrastructure Development: GNSS-enabled equipment with Base and Rover stations         enhances the precision of construction activities, ensuring accurate positioning of     structures and             infrastructure.

    Base and Rover stations form the backbone of GNSS technology, enabling high-precision positioning in various fields. As technology continues to advance, the applications of GNSS with Base and Rover stations are likely to expand, contributing to increased efficiency and accuracy in diverse industries.

    ]]>    Thu, 18 Jan 2024 13:22:35 +0000