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A comparative analysis of the vertical accuracy of multiple open-source digital elevation models for the mountainous terrain of the north-western Himalaya

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Abstract

The digital elevation model (DEM), a quantitative depiction of the topography, is crucial for hydrological and Earth Science applications. It is essential to assess the precision of the parameters obtained from the various DEMs available for morphometric study of the catchment region and extraction of the elevation. The accuracy of these datasets, which varies from one dataset to the next, is not always evident. We evaluated DEMs from the Shuttle Radar Topography Mission (SRTM), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), and CARTOSAT in terms of vertical accuracy, morphometric characteristics, and longitudinal river profile. The investigation was conducted in the Himalayan basin-Lohawati, in the Eastern Kumaon region of Uttarakhand, India. The SRTM performance was found to be more accurate than the ASTER and CARTOSAT DEMs in terms of overall vertical accuracy, as measured by mean absolute error, mean bias error, root-mean-square error, normalized root-mean-square error, relative root-mean-square error, and Nash–Sutcliffe Efficiency. The morphometric analysis revealed that the basin was elongated with a low relief ratio, gentle slopes, and low drainage density. The results from various DEM sources were comparable, indicating that the majority of morphometric parameters were not significantly scale- and source-dependent. SRTM and ASTER DEMs produced better results than CARTOSAT DEM, as demonstrated by the longitudinal river profile. Researchers employing such products in a variety of modelling exercises may find these results to be extremely useful. However, the findings of this study must be evaluated and validated across a broader range of geographies and lithologies.

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Data availability

The majority of the data utilized in this study can be obtained without cost from several online databases. Data tiles for both the ASTER GDEM and SRTM DEM were obtained for free from the USGS Earth Explorer repository. The CartoDEM tiles originated from ISRO's Geo-Platform, Bhuvan, which provides open access to a variety of geospatial datasets. The remaining data used are available within the manuscript in the form of tables.

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Acknowledgements

The authors would like to express their gratitude to the Director of ICAR-Directorate of Coldwater Fisheries Research and the Director of ICAR-Central Institute of Fisheries Education, Mumbai, for providing the necessary resources for this study. The information provided by the NRSC, Bhuvan, and the U.S. Geological Survey's earth explorer is greatly appreciated. Sincere thanks are expressed to both Mr. Govind and Mr. Mahesh for their support in the field data collection. The anonymous reviewers are acknowledged for their informative remarks that contributed to the manuscript's improvement.

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PAG: conceptualisation, resources, methodology, data curation, software, writing—original draft, and writing—review and editing. RP: methodology, software, and formal analysis. ASA: analysis, editing, and visualization. VSB: investigation, supervision, and visualization. VKS: investigation, supervision, visualization, and review. DS: supervision and visualization. PKP: supervision visualization, review and editing.

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Correspondence to Ravindra Posti.

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Ganie, P.A., Posti, R., Aswal, A.S. et al. A comparative analysis of the vertical accuracy of multiple open-source digital elevation models for the mountainous terrain of the north-western Himalaya. Model. Earth Syst. Environ. 9, 2723–2743 (2023). https://doi.org/10.1007/s40808-022-01641-x

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  • DOI: https://doi.org/10.1007/s40808-022-01641-x

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