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Evaluation and Comparison of Multi Resolution DEM Derived Through Cartosat-1 Stereo Pair – A Case Study of Damanganga Basin

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Abstract

The study evaluates and compares Digital Elevation Model (DEM) data of various grid spacing derived using high resolution Cartosat 1 stereo data for hydrologic applications. DEM is essential in modeling different environmental processes which depend on surface elevation. The accuracy of derived DEM varies with grid spacing and source. The CartoDEM is the photogrammetric DEM derived from stereo pairs. Damanganga basin lying in the Western Ghats was analysed using 11 Carto stereo pairs. The process of triangulation resulted in RMSE of 0.42. DEM was extracted at 10 m, 20 m, 30 m, 40 m, 50 m and 90 m grid spacing and compared with ASTER GDEM (30 m) and SRTM DEM (90 m). DEM accuracy was checked with Root Mean Square Error (RMSE) statistic for random points generated in different elevation zones. Extracted stream networks were compared based on Correctness Index and Figure of Merit index, calculated for all the Digital Elevation Models at varying cell sizes. In order to further evaluate the DEM’s, a simple flood simulation with no water movement and no consideration of real time precipitation data was carried out and relationship between heights of flood stage and inundation area for each Digital Elevation Model was also established.

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Acknowledgments

The authors wish to acknowledge the encouragement provided by Dr V K Dadhwal, Director, NRSC, Hyderabad, Dr YVN Krishnamurthy, Deputy Director, RC, NRSC, Hyderabad and support provided by Dr. A K Joshi, General Manager RRSC (Central), Nagpur. Sincere thanks are due to Mr. Prashant Kavishwar of CCOST, Raipur for valuable suggestions during DEM generation from Cartosat −1 stereo pairs along with Nikita Gehlot and Shalu Soni of MDSU, Ajmer for support in the analysis.

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Correspondence to Rajashree Vinod Bothale.

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Bothale, R.V., Pandey, B. Evaluation and Comparison of Multi Resolution DEM Derived Through Cartosat-1 Stereo Pair – A Case Study of Damanganga Basin. J Indian Soc Remote Sens 41, 497–507 (2013). https://doi.org/10.1007/s12524-012-0243-2

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