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Measuring the accuracy of contour interpolated digital elevation models

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Abstract

Digital elevation models (DEM) are becoming increasingly important as tools in hydrological research and water resources management. Since error and uncertainty are inherently associated with spatial data, a complete evaluation of a DEM is of utmost importance before it is put into subsequent analysis. The present paper offers an innovative approach for quality assessment of contour interpolated DEMs of different resolutions. Five most frequently cited interpolation methods viz., TIN with linear interpolation, Inverse Distance Weighing, Thin Plate Spline, Ordinary Kriging and TOPOGRID were selected for gridding of contours at five different resolutions i.e., 30m, 45m, 60m, 75m and 90m. In order to compare the quality of interpolated DEMs, a qualitative and quantitative evaluation of inter-polated DEMs for their vertical, horizontal and shape accuracy were carried out. It was found that different interpolation methods produced DEMs with different levels of artifacts. The analyses of vertical accuracy suggested that the variations were not pronounced in nature. However, the quantitative comparisons for horizontal and shape accuracy showed that there was a high level of disparity with significant differences among the interpolated DEMs.

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Correspondence to Arabinda Sharma.

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Sharma, A., Tiwari, K.N. & Bhadoria, P.B.S. Measuring the accuracy of contour interpolated digital elevation models. J Indian Soc Remote Sens 37, 139–146 (2009). https://doi.org/10.1007/s12524-009-0005-y

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  • DOI: https://doi.org/10.1007/s12524-009-0005-y

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