Quality assessment of open-source digital elevation models in northwest Namibia

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Title:Main Title: Quality assessment of open-source digital elevation models in northwest Namibia
Description:Abstract: This study aims to conduct a quality assessment of the vertical accuracy and precision of common used open-source DEMs. The selected study area in the northwest of Namibia contains various landscapes and geological settings (Goudie/Viles 2015: 27) to survey the quality under many conditions. Concerning the quality assessment, the following DEMs in a 30 m resolution were investigated: the ASTER and SRTM, 2016 released Advanced Land Observing Satellite (ALOS) and the 2019 released global 30 m version of the Copernicus DEM (GLO-30). In order to control the elevation heights of the DEM, laser altimetry ICESat-2 data were used as valid reference points. The applied method in this study is based on the approach in Kramm/Hoffmeister (2019). While the study of Kramm/Hoffmeister carried out the quality assessment in the Atacama Desert in northern Chile. The study area in northwest Namibia shows several climatic similarities to northern Chile. Therefore the results can be compared to a certain degree among each other. In the past, several studies investigated the accuracy of open-source DEMs. A multitude of studies evaluated the performance of the ASTER, SRTM and the ALOS (Hui/Zhao 2018; Kramm/Hoffmeister 2019; Zhang et al. 2019). An insufficient data situation exists for the latest released GLO-30 DEM, apart from the official validation (Airbus 2020b). Furthermore, the studies mainly investigated the influence of increasing slope due to the DEM performance. To what extent the local geology may have an impact on the performance is only marginally researched. Three main research questions arise accordingly: i) Does the latest released GLO-30 provide the most accurate and precise elevation heights? ii) Which DEM shows the lowest error and the smallest range of error distribution due to different landforms and the local geology? iii) Are occurring errors, apart from the topography, correlated to the local geology?
Responsible Party
Creator:Julian Krieger (Author)
Contributors:Frank Lehmkuhl (Supervisor), Janek Walk (Supervisor)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2021
Topic
CRC1211 Topic:Surface
Related Subproject:C2
Subjects:Keywords: Remote Sensing, Geomorphology, Terrestrial Observation, Arid Zone
Geogr. Information Topic:Elevation
File Details
Filename:BA_Krieger_2021_Quality_assessment_DEM_Namibia.pdf
Data Type:Text - Text
Size:51 Pages
File Size:2.7 MB
Date:Created: 24.08.2021
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[CRC1211DB] Data policy agreement
Geographic
Specific Information - Report
Report Date:24th of August, 2021
Report Type:Bachelor Thesis
Report City:Aachen
Report Institution:RWTH Aachen University
Metadata Details
Metadata Creator:Janek Walk
Metadata Created:22.09.2021
Metadata Last Updated:22.09.2021
Subproject:C2
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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