Universität zu Köln

Kramm, Tanja ORCID: 0000-0003-2684-7157 and Hoffmeister, Dirk ORCID: 0000-0002-8178-557X (2019). A Relief Dependent Evaluation of Digital Elevation Models on Different Scales for Northern Chile. ISPRS Int. Geo-Inf., 8 (10). BASEL: MDPI. ISSN 2220-9964

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Abstract

Many geoscientific computations are directly influenced by the resolution and accuracy of digital elevation models (DEMs). Therefore, knowledge about the accuracy of DEMs is essential to avoid misleading results. In this study, a comprehensive evaluation of the vertical accuracy of globally available DEMs from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Shuttle Radar Topography Mission (SRTM), Advanced Land Observing Satellite (ALOS) World 3D and TanDEM-X WorldDEM (TM) was conducted for a large region in Northern Chile. Additionally, several very high-resolution DEM datasets were derived from Satellite Pour l'Observation de la Terre (SPOT) 6/7 and Pleiades stereo satellite imagery for smaller areas. All datasets were evaluated with three reference datasets, namely elevation points from both Ice, Cloud, and land Elevation (ICESat) satellites, as well as very accurate high-resolution elevation data derived by unmanned aerial vehicle (UAV)-based photogrammetry and terrestrial laser scanning (TLS). The accuracy was also evaluated with regard to the existing relief by relating the accuracy results to slope, terrain ruggedness index (TRI) and topographic position index (TPI). For all datasets with global availability, the highest overall accuracies are reached by TanDEM-X WorldDEM (TM) and the lowest by ASTER Global DEM (GDEM). On the local scale, Pleiades DEMs showed a slightly higher accuracy as SPOT imagery. Generally, accuracy highly depends on topography and the error is rising up to four times for high resolution DEMs and up to eight times for low-resolution DEMs in steeply sloped terrain compared to flat landscapes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kramm, Tanja UNSPECIFIED orcid.org/0000-0003-2684-7157 UNSPECIFIED Hoffmeister, Dirk UNSPECIFIED orcid.org/0000-0002-8178-557X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-131797
DOI:	10.3390/ijgi8100430
Journal or Publication Title:	ISPRS Int. Geo-Inf.
Volume:	8
Number:	10
Date:	2019
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2220-9964
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ASTER GDEM V2; TANDEM-X; ACCURACY ASSESSMENT; VERTICAL ACCURACY; ATACAMA DESERT; DEM RESOLUTION; TOPOGRAPHIC POSITION; LOESS PLATEAU; SRTM; VALIDATION Multiple languages Geography, Physical; Remote Sensing Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13179