NRSC has created large scale 3D spatial at 1:1000 (including attribute information) for Hyderabad, Bangalore and Kolkata from Aerial Photographs of 1:6000 for National Informatics Centre. A detailed floor level mapping was carried out using Photogrammetry techniques.
NRSC has created large scale 3D spatial at 1:1000 (including attribute information) for Hyderabad, Bangalore and Kolkata from Aerial Photographs of 1:6000 for National Informatics Centre. A detailed floor level mapping was carried out using Photogrammetry techniques. Large Scale 3D spatial/nonspatial databases have become indispensable in Utility GIS applications like urban planning, water and sewerage management, transportation, revenue tax collection, garbage disposal, telecom services and other location based services in their day-to-day operations and in future planning and development. The Advantages include An accurate 3D basemap, Massive infrastructure dataset, Provides holistic approach to future planning and 3D visualization.
Generation of Cadastral Maps
Cadastral Mapping of Nizamabad district of Andhra Pradesh covering an area of 6600 Sq. Km. using aerial photography (1:10000) & Photogrammetry techniques is an unique project and first of its kind in the country, takenup for such a large area. A seamless ortho product with an accuracy of 25cm was made for the district. This pilot cadastral resurvey applications was carried out for Survey Settlement & Land Records, Government of Andhra Pradesh towards an Integrated Land Information System. Most significant contributions include Aerotriangulation & Block adjustment of whopping 7400 frames for the first time for Cadastral resurvey, Technology demonstration for Cadastral resurvey applications, Seamless Digital Orthoimages for entire district with positional accuracy of 25cm for cadastral resurvey and Successful validation of Digital Orthophotos with field survey measurements.
Airborne SAR & LiDAR for Disaster management
NRSC has executed a flood plain mapping project for Orissa covering an area of 8000 Sq. Km. under ISRO’s Disaster Management Support Programme using data from airborne LIDAR / Digital camera. The LIDAR/ Digital Camera are closely coupled with GPS & IMU for position and attitude determination. The data is post processed to derive the georeferenced LIDAR point cloud data Digital Surface model and digital camera images. By LIDAR data classification, Digital Elevation Model is generated from the and the orthophotos are generated using the DEM and the images. Subsequently 2D maps in 1:5000 are generated from the orthophotos. The project deliverables are Close contours of 0.5m contour interval from LIDAR, Orthophotos using digital camera images & DEM from LIDAR, GIS compatible basemap @ 1:5000 from Orthophotos. NRSC has conducted test flights of Airborne Synthetic Aperture Radar (SAR) developed indigenously by SAC, Ahmedhabad for Disaster Management as part of ISRO’S Disaster Management Support Programme. It is an active sensor which has cloud penetrating and all-weather imaging capability being utilized for mapping and monitoring of large areas affected by natural disasters especially floods . The primary goal of the DM – SAR system is to generate data products in disaster situation for damage assessment, relief & rescue operation at minimum turn around time. The flight model of SAR will be inducted into operations shortly.
Aerial photography of 146 towns for NUIS project
Ministry of Urban Development has launched the NUIS Scheme, on a pilot basis, during the Tenth Five Year Plan to develop GIS databases for 137 towns/cities in the country in two scales i.e., 1:10000 & 1:2000 in March 2006. The utility mapping on 1:1000 scale will also be undertaken for 24 towns. The spatial and attribute database generated will be useful for preparation of Master/Development Plans, detailed Town Planning Schemes and serve as decision-support. AS&DMA has carried out aerial photography over 132 towns spread in 29 states of India at 1:10000 with 60% (Forward) & 30% (Lateral) Overlaps with a minimum area of extent of 25 sqkm in each location in 2 years timeperiod.
Aerial Photography and Mapping of Republic of Maldives
The Archipelago of Maldives comprises of 1189 Islands having 300 Sq. Km of Land area spread over 80,000 Sq. Km of water. Mapping the Maldives is a challenge as it is not possible to extend control. NRSC has carried out the task for the Ministry of External Affairs (MEA), Government of India. Methodology involved aerial photography of entire Maldives, aerial photography with large format metric cameras flown with computer controlled navigation systems and KGPS, DGPS control survey, scanning on photogrammetric scanners, aero triangulation & block adjustment, DEM/contour generation, 3-D vector capture and field verification. Aerial photography in 1:40,000 for entire Republic of Maldives and 1: 6000 scale for selected islands were acquired. Pre-targets of 5m x 5m dimensions were placed at different islands and DGPS observation was carried out simultaneously with aerial photography. Zero order reference stations were established using GPS for entire Repubic of Maldives in WGS 84 datum. Digital maps of 1: 25,000 scale for entire Republic of Maldives & 1: 1000 scale for selected islands were prepared using latest Photogrammetric Techniques & Technologies. Remote sensing centre was established at Male.