Traditional land surveying methods in Tamil Nadu, such as chain and tape measurements, are now being replaced by the cutting-edge Differential Global Positioning System (DGPS) technology. This new system provides sub-centimetre accuracy, transforming the way land measurements and boundary verifications are handled. Unlike traditional surveying methods that could take days or even weeks, DGPS offers a faster and more reliable way to conduct land surveys, drastically reducing the time required to process requests. This upgrade not only promises faster turnaround times but also leads to fewer disputes and ensures more reliable records for property owners.
Key Benefits of DGPS for Landowners:
- Faster Verification & Adjustments:
- No more waiting for physical surveys for minor boundary checks or land subdivision requests.
- Property owners can access accurate land data digitally, without visiting government offices.
- Improved Accuracy:
- DGPS technology improves location accuracy from 15 meters (GPS) to as precise as 1 cm.
- Coordinates are provided alongside detailed field measurement sketches for official and legal purposes.
- Remote Access:
- Once a DGPS survey is completed, data can be accessed remotely, making it easier for landowners to manage their properties.
- Legal & Resale Use:
- The precise coordinates from DGPS surveys can be used for resolving land disputes, land transactions, and resale purposes.
Building a Robust DGPS Infrastructure
Tamil Nadu is the first state in India to establish a massive DGPS infrastructure with 70 Continuously Operating Reference Stations (CORS).These stations ensure sub-centimetre accuracy in land positioning and are connected to the national reference network, integrating Tamil Nadu’s data into a larger national framework. The technology is integrated with the national reference system, enabling more precise and reliable data.
Project Overview: How DGPS Works in Chennai:
- Survey Locations: The DGPS survey covers the 1189 sq.km area of Chennai Metropolitan Area (CMA).
- Survey Method:
- Triangulation methods are used for both primary and secondary control points.
- Differential Global Navigation Satellite System (DGNSS) and multi-frequency receivers are employed for high-precision data collection.
- Static Method for observations at base points, with 6-hour observation windows for SSCPs and 1-hour for TSCPs.
- Data Collection:
- Raw data is collected in Receiver Independent Exchange Format (RINEX) and processed in the Survey of India coordinate system.
- Final data is provided in UTM coordinates and is geo-referenced, ensuring consistency across various systems.
A Statewide Transformation: The Introduction of DGPS
The rollout of DGPS technology is already making waves, with 100 pattas (land records) issued in the initial phase, proving its effectiveness in simplifying the land administration process. With applications for subdivision and non-subdivision of land being processed faster, the move to DGPS promises to streamline administrative procedures significantly.
After successful pilots in Namakkal, Ranipet, and Virudhunagar, DGPS technology has now been extended to Chennai, Chengalpet, Tiruvallur, Coimbatore, and Tirupur.
A key element of the DGPS transition is training government staff to handle the new technology effectively. While the technology has the potential to revolutionize the land survey process, officials emphasize the importance of maintaining government oversight. The survey process, measurements, and administration must remain under the control of government staff to ensure accountability, precision, and the integrity of the data. “The survey technology, measurement, and administration should be done by government staff and not privatized,” says Anna Kuberan, Secretary of the Tamil Nadu Survey Officers Union.
Why This Matters: Enhanced Transparency and Convenience for Citizens
This technological upgrade is not just a game-changer for government administration but also for Tamil Nadu’s residents. With over five crore patta holders in the state, this advancement promises to reduce the backlog in land survey requests, streamline the property ownership verification process, and make land transactions more secure. The integration of DGPS is a major step toward modernizing land governance and addressing issues of land disputes and encroachments.