Comparison of different digital elevation models for drainage morphometric parameters: a case study from South India
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ORIGINAL PAPER
Comparison of different digital elevation models for drainage morphometric parameters: a case study from South India Venkatesh Kasi 1 & Ramdas Pinninti 1 & Sankar Rao Landa 1 & Maheswaran Rathinasamy 1 Chandramouli Sangamreddi 1 & Rajeshwar Rao Kuppili 1 & Prasada Raju Dandu Radha 2
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Received: 10 August 2019 / Accepted: 18 September 2020 # Saudi Society for Geosciences 2020
Abstract With a plethora of digital elevation models (DEM) available for elevation extraction and catchment morphometric analysis, it is essential to compare and investigate their accuracy and parameter uncertainty derived from them. To serve that purpose, in this study, we have compared the DEMs of different resolution obtained from Shuttle Radar Topography Mission (SRTM), CARTOSAT, and topographic maps (1:25000) in terms of vertical accuracy and morphometric parameters. The investigation was performed on a sub-basin of Champavathi River which is located in Andhra Pradesh, the southern part of India. The vertical accuracy of the DEMs was estimated using elevation from about 1180 points obtained from the Differential Global Positioning System (DGPS) survey. The morphometric analysis showed that the basin is elongated with low relief ratio, mild/rolling slopes, and medium drainage density, and the results were comparable from different DEM sources indicating that most of the morphometric parameters were not significantly dependent on the scale and source of the DEM. Further, vertical accuracy estimation showed that the CARTOSAT DEMs (10 m and 30 m) have a lower root mean square error (4.53 m and 5.89 m) when compared with the SRTM DEMs (6.11 m and 7.19 m). Keywords Drainage morphometry . Comparison of DEM . Cartosat . Vertical accuracy
Introduction With increasing urban population, the stress on existing water resources is multiplying manifolds. Further, with the uncertainties associated with the frequency and intensity of the rainfall, it becomes pertinent to evaluate the water resources availability as they play a significant role in the sustainable development of the economy. The excessive demand due to urban sprawl in countries like India puts stress in the available Responsible Editor: Biswajeet Pradhan Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12517-020-06049-4) contains supplementary material, which is available to authorized users. * Maheswaran Rathinasamy [email protected] 1
Department of Civil Engineering, MVGR College of Engineering, Vizianagaram, Andhra Pradesh 535005, India
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Department of Mechanical Engineering, MVGR College of Engineering, Vizianagaram, Andhra Pradesh 535005, India
ground and surface water supplies (Maheswaran et al. 2016; Sachindra et al. 2018), and it is essential to understand the present status of water resources before undertaking developmental projects. The morphometric analysis is a critical component in evaluating the water resources and identifying the recharge sites, runoff modelling (Abdulkareem et al. 2018), soil erosio
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