Digital elevation models on accuracy validation and bias correction in vertical
نویسندگان
چکیده
منابع مشابه
Accuracy Assessment of Digital Elevation Models based on Approximation Theory
Empirical research in DEM accuracy assessment has observed that DEM errors are correlated with terrain morphology, sampling density, and interpolation method. However, theoretical reasons for these correlations have not been accounted for. This paper introduces approximation theory adapted from computational science as a new framework to assess the accuracy of DEMs interpolated from topographic...
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Despite the relatively high cost of airborne lidar-derived digital elevation models (DEMs), such products are usually presented without a satisfactory associated estimate of accuracy. For the most part, DEM accuracy estimates are typically provided by comparing lidar heights against a finite sample of check point coordinates from an independent source of higher accuracy, supposing a normal dist...
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We study the accuracy of data on some local topographic attributes derived from digital elevation models (DEMs). First, we carry out a test for the precision of four methods for calculation of partial derivatives of elevations. We ® nd that the Evans method is the most precision algorithm of this kind. Second, we produce formulae for root mean square errors of four local topographic variables (...
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The paper presents results of a comparative study of the vegetation-caused elevation bias of the space shuttle topographic mission data product, both Cand X-band (SRTM.C/X). The SRTM.C/X bands data were compared against a high-resolution digital terrain model. Pixel-based differences in SRTM.X minus SRTM.C were correlated with land cover (‘agriculture’, ‘house’, ‘tree’, ‘water’). Findings of th...
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ژورنال
عنوان ژورنال: Modeling Earth Systems and Environment
سال: 2015
ISSN: 2363-6203,2363-6211
DOI: 10.1007/s40808-015-0069-3