Vertical accuracy evaluation of SRTM-GL1, GDEM-V2, AW3D30 and CartoDEM-V3.1 of 30-m resolution with dual frequency GNSS for lower Tapi Basin India |
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| Authors: | Akshay O Jain Tejaskumar Thaker Ashish Chaurasia Parth Patel Anupam Kumar Singh |
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| Institution: | 1. Department of Civil Engineering, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar, Indiaakshay.jain@sot.pdpu.ac.in;3. Department of Civil Engineering, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar, India;4. Department of Civil Engineering, Institute of Engineering and Technology, JK Lakshmipat University, Jaipur, India |
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| Abstract: | AbstractShuttle Radar Topography Mission (SRTM-GL1), Advanced Space Borne Thermal Emission and Reflection Radiometer- Global DEM (GDEM-V2), recently released Advanced Land Observing Satellite (‘DAICHI’) DEM (AW3D30) and Indian National Cartosat-1 DEM v3 (CartoDEM-V3.1) provide free topographic data at a 30-m resolution for Indian peninsula. In this research study, the vertical accuracy of DEM is evaluated for above data-sets and compared with high accuracy dual frequency GNSS of a millimetre accuracy. The extensive field investigation is carried out using a stratified random fast static DGPS survey for collecting 117 high accuracy ground control points in a predominantly agriculture catchment. Further, the effect of land cover, slope and low-lying coastal zone on DEM vertical accuracy was also analysed and presented in this study. |
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| Keywords: | Digital elevation model GNSS SRTM-GL1 GDEM-V2 AW3D30 CartoDEM-V3 1 lower Tapi Basin India |
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