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| Titel |
Validation of Digital Elevation Models around Merapi Volcano, Java, Indonesia |
| VerfasserIn |
C. Gerstenecker, G. Läufer, D. Steineck, C. Tiede, B. Wrobel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 5, no. 6 ; Nr. 5, no. 6 (2005-11-08), S.863-876 |
| Datensatznummer |
250002882
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| Publikation (Nr.) |
 copernicus.org/nhess-5-863-2005.pdf |
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| Zusammenfassung |
| The accuracy of 4 Digital Elevation Models (SRTM30, GTOPO30, SRTM3 and local
DEM produced from aerial photogrammetric images) for the volcanoes Merapi
and Merbabu in Java, Indonesia is investigated by comparison with 443 GPS
ground control points. The study confirms the high accuracy of SRTM3 and
SRTM30, even if the a priori defined 90% confidence level of 16 m for the
SRTM3 is not always achieved in this mountainous region. Accuracy of SRTM30,
GTOPO30 and SRTM3 is mainly dependent on the altitude itself and the slopes'
inclinations, whereas the photogrammetric DEM exhibits constant accuracy
over a wide range of altitudes and slopes. For SRTM3 and SRTM30 a
statistically significant correlation between heights and aspects of the
slopes is also found.
Accuracy of DEMs which are generated by interpolation on a finer grid does
not change significantly. Smoothing of DEMs on a coarser grid, however,
decreases accuracy. The decrease in accuracy is again dependent on altitude
and slope inclination.
The comparison of SRTM30 with GTOPO30 exhibits a significant improvement of
SRTM30 data. |
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