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      https://www.ias.ac.in/article/fulltext/jess/124/03/0487-0495

    • Keywords

       

      DEM accuracy; grid size; scale; Cartosat-1; terrain roughness; entropy.

    • Abstract

       

      Digital Elevation Model (DEM) provides basic information about terrain relief and is used for morphological characterisation, hydrological modelling and infrastructural studies. This paper investigates the accuracy of DEM and its derived attributes in multiple scales. This study was carried out for a part of Shiwalik Himalaya using Cartosat-1 stereo pair data. DEM at various cell sizes were generated and information content was compared using mean elevation, variance and entropy statistics. Various post-spacing DEMs were validated to understand variation in vertical accuracy along different scales. The vertical accuracy (3.14–7.24 m) is affected in larger spacing DEM and elevation is underestimated. Slope of terrain also has similar impacts. The DEM and slope accuracy are also affected by the terrain roughness while assessing coarser grid size.

    • Author Affiliations

       

      Samadrita Mukherjee1 Sandip Mukherjee2 A Bhardwaj1 Anirban Mukhopadhyay3 R D Garg4 S Hazra3

      1. Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, India.
      2. Department of Natural Resources, TERI University, New Delhi 110 070, India.
      3. School of Oceanographic Studies, Jadavpur University, Kolkata, India.
      4. Department of Civil Engineering, Indian Institute of Technology, Roorkee 247 667, India.
    • Dates

       
  • Journal of Earth System Science | News

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