Abstract
Abstract. DEM and ortho-imageries are building blocks for topographic mapping and satellite imageries are prime source of data for inaccessible terrain. When the required mapping scale is of the order 10k or higher, the accuracy needed is also of higher order. It becomes imperative to evaluate the accuracy of available high resolution DEMs and corresponding imageries to provide quality products for mapping. The present study is encouraged by the fact that not every place of our earth is accessible, so an assessment of satellite data products is required for precise mapping. Here, the accuracy assessment has been carried out in terms of RMSE, SD, CE90 and LE90 of various products viz. Carosat-1, Cartosat-2E, Worldview-2 (WV), Vricon, Pleiades, ALOS-World-3D (AW3D) ASTER, SRTM with Yahoo image. GCPs acquired by DGPS field survey were used to evaluate the products. The results have demonstrated that Vricon 0.5 m ortho-image provides the best RMSE (3.42) and CE90 (4.65); however, WV and Vricon DEM turns out to be best with RMSE of 2.20 m and 2.90 m respectively. Both products are suitable for large scale topographic mapping. The data can be used for inaccessible terrain where GCPs are not available. However, Cartosat-1 and Cartosat-2E can be used where good GCPs are available. The outcome of study can be used for planning of data suitability for scale variant mapping and inaccessible terrain mapping.
Highlights
Accurate geo-spatial information on Digital Elevation Models and ortho-rectified images are crucial for mapping products
The statistical indices used for the purpose are Min-Max error range, Mean Error, Root Mean Square Error (RMSE), LE 90 and CE 90
To evaluate the accuracy of the above products, 56 reference points or GCPs were collected during the field survey; only 32 points could be used for the assessment purposes which are identifiable in all the considered ortho imageries
Summary
Accurate geo-spatial information on Digital Elevation Models and ortho-rectified images are crucial for mapping products. Remote sensing satellite imageries are an important source of spatial data to prepare the base for extraction of geo-spatial intelligence required in the maps for inaccessible terrain (Anderson, Ryan, Sonntag, Kavvada, & Friedl, 2017; Corbane et al, 2017; Li, 1998; Ottichilo & Khamala, 2010; Radhadevi et al, 2009, 2010). High resolution DEM and ortho-rectified satellite images are vital to depict the basic information about the terrain relief with the natural and man-made features while attempting large scale mapping especially in inaccessible terrains (Amin Khan, Akhter, & Ahmad, 2013; Baral, Das, Saraf, Borgohain, & Singh, 2016; Li, 1998; Ottichilo & Khamala, 2010; Radhadevi et al, 2009, 2010; Vaze, Teng, & Spencer, 2010). The present and future planned earth imaging satellites provides and will be providing strong geometric capabilities that are motivating to mapping community for large scale topographic mapping of even the hardest of inaccessible terrain present on surface
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