DGPS Survey Services in Chennai
💡 When is DGPS the only option?
If you are buying a 10-acre parcel in Kanchipuram or Tiruvallur, the land is likely covered in thick shrubs and lacks clear boundary markers. A traditional surveyor would spend a week cutting bushes just to get a line of sight. DGPS ignores the bushes, talks directly to satellites, and maps the exact boundary in a single day, saving you massive amounts of time and labor costs.
How DGPS (RTK) Works
Base Station Setup
We install a DGPS Base Station on a known, fixed coordinate point. This base communicates with satellites to calculate precise error-correction data.
Rover Deployment
Our surveyors walk the perimeter and interior of the land using a DGPS Rover. The rover receives real-time corrections from the base station via radio link.
Real-Time Kinematic (RTK) Measurement
As the rover is placed on boundary corners, it records X, Y, and Z coordinates with sub-centimeter accuracy instantly.
FMB Superimposition
The global coordinate data is overlaid onto the local government FMB (Field Measurement Book) sketch to verify legal boundaries.
Data Export
Coordinates are exported in formats required by CMDA/DTCP or imported directly into AutoCAD for drawing generation.
Frequently Asked Questions
What is the difference between DGPS and Total Station?+
Total Station uses lasers and requires a clear line-of-sight between the instrument and the target, making it perfect for dense urban areas. DGPS uses GPS satellites. It works over massive distances (like a 50-acre farm) and through thick bushes, but struggles inside cities surrounded by tall buildings.
Why does CMDA require DGPS coordinates?+
For large developments, CMDA and RERA require absolute global coordinates (Latitude/Longitude) to officially register the exact location of the project on the government's master map, ensuring it does not overlap with water bodies or reserve forests.
How accurate is DGPS?+
Standard GPS on your phone is accurate to about 3-5 meters. Differential GPS (DGPS) uses a stationary base to correct atmospheric errors, achieving sub-centimeter (millimeter-level) accuracy.
Can you survey a forest or heavily vegetated land?+
Yes. Unlike a Total Station which requires chopping down bushes to see the target, a DGPS rover only needs a clear view of the sky to communicate with satellites, making it ideal for overgrown plots.
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Ready to get started?
Talk to our engineers in Chennai for a consultation on your project requirements.