UAV Based Photogrammetry Survey (Drone Survey)
Conventional Surveying activity is time-consuming, difficult and often dangerous. UAV Based 3D Survey is a professional tool that allows surveyors to collect unlimited aerial data and precise measurements, while saving time and manpower. The drone is automatically deployed and landed, and the system analyzes the aerial data, creating highly accurate, best-in-class orthophotos and digital elevation models to assist in surveying reports.
UAS Based Survey - Applications
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RTK / PPK Drone Survey Workflow
Photogrammetry Drone: The Phantom 4 RTK is used by surveyors for high-precision surveying and mapping missions. It also adds a RTK/PPK positioning module, a new TimeSync system, and a purpose-built mapping app. Phantom 4 RTK/PPK given survey grade accuracy data while requiring fewer ground control points.
We have completed 1000+ kms of Green Field NHAI Projects in Andhra Pradesh, Maharashtra, Rajasthan, Orissa, Jharkhand, Kerala and Tamil Nadu. We have done asset mapping projects for NHAI at Punjab, Haryana, Maharashtra, Madhya Pradesh and Rajasthan for 450 Kms. There are few Road construction projects completed for L&T Construction Ltd.
We use the RTK/PPK enabled survey grade drone for achieving accuracy of 2 - 10 cm according to Field condition.
We have completed 1000+ kms of Green Field NHAI Projects in Andhra Pradesh, Maharashtra, Rajasthan, Orissa, Jharkhand, Kerala and Tamil Nadu. We have done asset mapping projects for NHAI at Punjab, Haryana, Maharashtra, Madhya Pradesh and Rajasthan for 450 Kms. There are few Road construction projects completed for L&T Construction Ltd.
We use the RTK/PPK enabled survey grade drone for achieving accuracy of 2 - 10 cm according to Field condition.
UAV Surveying at Field
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Data Processing
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PIX 4D Mapper or similar leading photogrammetry processing software shall be used for geo-referencing the images, validate with ground control point, generates ortho-mosaic image and point Cloud Data. After Image Post Processing, CAD Drawings shall be prepared based on Orthomosaic Image. Point Cloud Data shall be classified for Ground Points. Ground Surface, DEM, DSM, 3D Models are generated classified point clouds. Once the drawings are ready, we print and check the data in field and update the drawing without any omission. Finally, CAD/GIS Compatible Drawings will be delivered |
Deliverable
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Raw data from Drone, Images
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Orthomosaic Image, Geo-referenced
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Drone LiDAR (or) Drone Photogrammetry?
None of these technologies is better than the other, and none of them will cover all the use cases.
LiDAR can work in poor lighting conditions and even at night. Photogrammetry points clouds are more visual (each pixel has RGB), but often with generalized details, so it might be appropriate for objects where a lower level of geometric detail is acceptable but visual interpretation is essential.
In photogrammetry, to process the data accurately is image overlap that should be at the level of 60-90% (front and side) depending on the terrain. The typical LiDAR survey requires only 20-30% overlap between flight lines, which makes the data acquisition operations much faster.
LiDAR data processing is fast. Raw data require just a few minutes of calibration to generate the final product. In photogrammetry, data processing is the most time-consuming part of the overall process.
Accuracy: In surveying, accuracy always has two dimensions: relative and absolute. Relative accuracy is the measurement of how objects are positioned relative to each other. Absolute accuracy refers to the difference between the location of the objects and their true position on the Earth. LiDAR is one of the most accurate surveying technologies.
LiDAR should be certainly used when for surveying narrow structures such as power lines or telecom towers and for mapping areas below the tree canopy. Photogrammetry will be the best option for projects that require visual data.
LiDAR can work in poor lighting conditions and even at night. Photogrammetry points clouds are more visual (each pixel has RGB), but often with generalized details, so it might be appropriate for objects where a lower level of geometric detail is acceptable but visual interpretation is essential.
In photogrammetry, to process the data accurately is image overlap that should be at the level of 60-90% (front and side) depending on the terrain. The typical LiDAR survey requires only 20-30% overlap between flight lines, which makes the data acquisition operations much faster.
LiDAR data processing is fast. Raw data require just a few minutes of calibration to generate the final product. In photogrammetry, data processing is the most time-consuming part of the overall process.
Accuracy: In surveying, accuracy always has two dimensions: relative and absolute. Relative accuracy is the measurement of how objects are positioned relative to each other. Absolute accuracy refers to the difference between the location of the objects and their true position on the Earth. LiDAR is one of the most accurate surveying technologies.
LiDAR should be certainly used when for surveying narrow structures such as power lines or telecom towers and for mapping areas below the tree canopy. Photogrammetry will be the best option for projects that require visual data.
Drone Survey Gallery
Look closer you Area of Interest with Drone Videography Survey
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Point Cloud Animation with RGB Color of a Railway Track
Drone captures images with 70% overlap
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Drone Videography Survey
Workflow for RTK/PPK Drone Photogrammetry Survey
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