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Digital Elevation Model (DEM) generated from Cartosat-1 Satellite data for India

Catalog Info

Indian Remote Sensing Satellite Cartosat-1 is a along-track stereo mission. The DEM generated using the stereo images of Cartosat-1 with 1 arc sec (~30m) posting are available on Bhuvan portal of NRSC/ISRO for free download along with the technical documents. It is released as version 1.0 initially for the entire country and subsequently improved version 1.1 R1.
Chief Data Officer
Name: Dr. Vinod M Bothale
Designation:
Group Director, Geoportals & Web GIS Services
Ministry/State/Department: Department of Space
Indian Space Research Organization
National Remote Sensing Centre
Phone:
  • +91 4023884587
Address:
National Remote Sensing Centre (NRSC), Indian Space Research Organisation, Department of Space, Govt. of India, Balanagar, Hyderabad - 500037
2 Resource(s) found
Visual Access: NA
Granularity:
Others
File Size: 11.15 KB
Download: 2 167
NA
Note:
CartoDEM is generated using Augmented Stereo Strip Triangulation (ASST) - indigenously developed software by Space Application Centre, ISRO. The seamless CartoDEM generation is an automatic process and makes use of limited Ground Control Points (GCPs) in long stereo strip pairs using dense feature matching, Triangulated Irregular Network (TIN) modeling and automatic long strip mosaicing. The generated DEM and ortho images of eachCartosat-1 segment are cut into tiles of 7.5’x7.5’ extents. The entire Indian region is covered by approximately 500 Cartosat-1segments with a total number of around 20,000 tile pairs.
Visual Access: NA
Granularity:
NA
File Size: 11.15 KB
Download: 1 508
NA
Note:
The task of generating country wide DEM and ortho products from Cartosat-1 stereo data covering 28 states and 7 union territories of India has been taken up. Around 11,000 stereo pairs of Cartosat-1 data were used to cover entire country. Photogrammetric blocks are formed at state level to generate seamless data products across the states. Automatically generated Digital Elevation Models were edited with minimal break-lines to address the outliers and seamless across the scenes. The post processing for inland water bodies is successfully carried out to assign unique elevation value for each inland water body. DEM will provide a terrain model to facilitate drainage network analysis, watershed demarcation, erosion mapping, contour generation and quantitative analysis like volume-area calculation. DEM will enable generation of ortho-rectified images which can be used as raster maps to define and demarcate features such as land use, topography, roads, rivers, water-bodies etc. They may also be used to establish accurate geographic locations of features and make measurements. Other applications of DEM and Ortho-image include scene simulation and fly through visualization for appreciation of terrain relief.