Evaluation of digital elevation models for geomorphometric analyses on different scales for northern Chile

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Title:Main Title: Evaluation of digital elevation models for geomorphometric analyses on different scales for northern Chile
Description:Abstract: The resolution and accuracy of digital elevation models (DEMs) have direct influence on further geoscientific computations like landform classifications and hydrologic modelling results. Thus, it is crucial to analyse the accuracy of DEMs to select the most suitable elevation model regarding aim, accuracy and scale of the study. Nowadays several worldwide DEMs are available, as well as DEMs covering regional or local extents. In this study a variety of globally available elevation models were evaluated for an area of about 190,000 km2. Data from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) 30 m, Shuttle Radar Topography Mission (SRTM) 30 m and 90 m, Advanced Land Observing Satellite (ALOS) World 3D 30 m and TanDEM-X WorldDEM™ – 12 m and 90 m resolution were obtained. Additionally, several very high resolution DEM data were derived from stereo satellite imagery from SPOT 6/7 and Pléiades for smaller areas of about 100–400 km2 for each dataset. All datasets were evaluated with height points of the Geoscience Laser Altimeter System (GLAS) instrument aboard the NASA Ice, Cloud, and land Elevation (ICESat) satellite on a regional scale and with nine very high resolution elevation models from UAV-based photogrammetry on a very large scale. For all datasets the root mean square error (RMSE) and normalized median absolute deviation (NMAD) was calculated. Furthermore, the association of errors to specific terrain was conducted by assigning these errors to landforms from the topographic position index (TPI), topographic roughness index (TRI) and slope. For all datasets with a global availability the results show the highest overall accuracies for the TanDEM-X 12 m (RMSE: 2.3 m, NMAD: 0.8 m). The lowest accuracies were detected for the 30 m ASTER GDEM v3 (RMSE: 8.9 m, NMAD: 7.1 m). Depending on the landscape the accuracies are higher for all DEMs in flat landscapes and the errors rise significantly in rougher terrain. Local scale DEMs derived from stereo satellite imagery show a varying overall accuracy, mainly depending on the topography covered by the scene.
Identifier:10.5194/isprs-archives-XLII-2-W13-1229-2019 (DOI)
Responsible Party
Creators:Tanja Kramm (Author), Dirk Hoffmeister (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:Copernicus GmbH
Publication Year:2019
Topic
CRC1211 Topic:Remote Sensing
Related Subproject:Z2
Subject:Keyword: Remote Sensing
Geogr. Information Topic:Geoscientific Information
File Details
Filename:isprs-archives-XLII-2-W13-1229-2019.pdf
Data Type:Text - Event Paper
File Size:1.6 MB
Date:Available: 14.06.2019
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:Free
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[Creative Commons] Attribution 4.0 International (CC BY 4.0)
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Publication Status:Published
Review Status:Peer reviewed
Publication Type:Event Paper
Proceedings Title:Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.
Volume:XLII-2/W13
Number of Pages:7 (1229 - 1235)
Event:ISPRS Geospatial Week 2019
Event Type:Conference
Event Location:Enschede, The Netherlands
Event Duration:10th of June, 2019 - 14th of June, 2019
Metadata Details
Metadata Creator:Dirk Hoffmeister
Metadata Created:14.06.2019
Metadata Last Updated:14.06.2019
Subproject:Z2
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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