Geomorphometry from SRTM : Comparison to NED

The Shuttle Radar Topography Mission (SRTM) produced near-global 1" and 3" DEMs. The cartographically-derived National Elevation Dataset (NED) provides a mechanism to assess SRTM quality. We compared 12 geomorphometric parameters from SRTM to NED for about 500,000 sample areas over the con...

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Bibliographic Details
Published in:Photogrammetric engineering and remote sensing 2006-03, Vol.72 (3), p.269-277
Main Author: GUTH, Peter L
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied geophysics
Biological and medical sciences
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
Internal geophysics
Teledetection and vegetation maps
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Summary:The Shuttle Radar Topography Mission (SRTM) produced near-global 1" and 3" DEMs. The cartographically-derived National Elevation Dataset (NED) provides a mechanism to assess SRTM quality. We compared 12 geomorphometric parameters from SRTM to NED for about 500,000 sample areas over the continental United States. For basic parameters like average elevation or relief, the two data sets correlate very highly. For more derived measures, such as curvature and higher moments (skewness and kurtosis), the correlations are much lower, with some parameters essentially uncorrelated between the two DEMS. Correlations improve after restricting analysis toregion with average slopes greater than 5 percent, and the SRTM data set compares more closely to simulated 2" NED than to 1" NED. SRTM has too much noise in flat areas, increasing average slope, while in high relief areas SRTM over smoothes topography and lowers average slopes. The true resolution of 1" SRTM DEMS proves to be no better than 2".
ISSN:0099-1112
2374-8079
DOI:10.14358/PERS.72.3.269