Multisensor Satellite Imagery for Terrain Relief mapping: case study of Tawang, Arunachal Pradesh
Student name: Ms Isha Sharma
Guide: Dr Chander Kumar Singh
Year of completion: 2015
Host Organisation: Defence Research and Development Organisation (DTRL), Defence Terrain Research Laboratory (DTRL), Ne
Supervisor (Host Organisation): Ms Nidhi Gahlot
Abstract: The availability of the vast spectrum of satellites operating in different
wavelengths gives an opportunity to explore their capability for terrain relief
mapping. The present study targets the elevation model generation using optical
(Cartosat-1) and SAR (Radarsat-1 and Envisat) satellite data for high relief
terrain of Tawang, Arunachal Pradesh and accuracy assessment of the
generated products i.e. DEMs and Ortho-imageries. The quality of the products
was analyzed in terms of type of sensors i.e. optical and SAR as well as in terms
of positional and vertical accuracy. The enhancement in accuracy was also
assessed using ASTER DEM and ETM imagery as reference for GCP and
accuracy assessment both. The analysis concludes and supports the fact that the
optical data give better representation of the terrain features in comparison to
SAR data. It is also concluded that Cartosat-1 data in conjunction with good
GCPS can be used for terrain relief mapping of high relief topography
analogous to Tawang, Arunachal Pradesh with sub-meter RMSE only.
Keywords: Digital Elevation Model (DEM), ortho-rectification, Cartosat-1,
Radarsat-1, Envisat.
