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201.
Arabinda Sharma K. N. Tiwari P. B. S. Bhadoria 《Journal of the Indian Society of Remote Sensing》2009,37(1):139-146
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. 相似文献