Details
| Original language | English |
|---|---|
| Title of host publication | Gravity, Geoid and Space Missions |
| Subtitle of host publication | GGSM 2004 IAG International Symposium Porto, Portugal August 30 – September 3, 2004 |
| Editors | Christopher Jekeli, Luisa Bastos, Joana Fernandes |
| Pages | 218-223 |
| Number of pages | 6 |
| ISBN (electronic) | 978-3-540-26932-8 |
| Publication status | Published - Sept 2005 |
Publication series
| Name | International Association of Geodesy Symposia |
|---|---|
| Volume | 129 |
| ISSN (Print) | 0939-9585 |
Abstract
High-resolution terrain data are crucial for gravity field modelling in mountainous regions. In areas without national digital elevation models (DEMs) available, fill-ins from global models have to be used. For this purpose, the global models GTOPO30 (30 resolution) and SRTM3 (3 resolution) are considered. The SRTM3 model has been released recently from the analysis of the Shuttle Radar Topography Mission and covers the latitudes between 60°N and 54°S, while the GTOPO30 model is a global public domain data set completed already in 1996. Li this contribution, 1 × 1 national DEMs for Germany are used to evaluate the global models. The differences between the best national models and the SRTM3 data show a standard deviation of 7.9 m with maximum differences up to about 300 m. The largest differences are located in opencast mining areas and result from the different epochs of the DEMs. Histograms of the differences reveal a clear deviation from the normal distribution with a long tail towards too high SRTM3 elevations. The evaluation of GTOPO30 shows that the longitudes should be increased by 30 (one block) in Germany. For the shifted GTOPO30 DEM, the standard deviation of the differences with respect to the best national model is 6.8 m, roughly 75 % smaller than for the original model.
Keywords
- DEM, DEM evaluation, Digital elevation model, GTOPO30, SRTM3, Terrain data
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Computers in Earth Sciences
- Earth and Planetary Sciences(all)
- Geophysics
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Gravity, Geoid and Space Missions: GGSM 2004 IAG International Symposium Porto, Portugal August 30 – September 3, 2004. ed. / Christopher Jekeli; Luisa Bastos; Joana Fernandes. 2005. p. 218-223 (International Association of Geodesy Symposia; Vol. 129).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Evaluation of SRTM3 and GTOPO30 Terrain Data in Germany
AU - Denker, H.
N1 - Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2005/9
Y1 - 2005/9
N2 - High-resolution terrain data are crucial for gravity field modelling in mountainous regions. In areas without national digital elevation models (DEMs) available, fill-ins from global models have to be used. For this purpose, the global models GTOPO30 (30 resolution) and SRTM3 (3 resolution) are considered. The SRTM3 model has been released recently from the analysis of the Shuttle Radar Topography Mission and covers the latitudes between 60°N and 54°S, while the GTOPO30 model is a global public domain data set completed already in 1996. Li this contribution, 1 × 1 national DEMs for Germany are used to evaluate the global models. The differences between the best national models and the SRTM3 data show a standard deviation of 7.9 m with maximum differences up to about 300 m. The largest differences are located in opencast mining areas and result from the different epochs of the DEMs. Histograms of the differences reveal a clear deviation from the normal distribution with a long tail towards too high SRTM3 elevations. The evaluation of GTOPO30 shows that the longitudes should be increased by 30 (one block) in Germany. For the shifted GTOPO30 DEM, the standard deviation of the differences with respect to the best national model is 6.8 m, roughly 75 % smaller than for the original model.
AB - High-resolution terrain data are crucial for gravity field modelling in mountainous regions. In areas without national digital elevation models (DEMs) available, fill-ins from global models have to be used. For this purpose, the global models GTOPO30 (30 resolution) and SRTM3 (3 resolution) are considered. The SRTM3 model has been released recently from the analysis of the Shuttle Radar Topography Mission and covers the latitudes between 60°N and 54°S, while the GTOPO30 model is a global public domain data set completed already in 1996. Li this contribution, 1 × 1 national DEMs for Germany are used to evaluate the global models. The differences between the best national models and the SRTM3 data show a standard deviation of 7.9 m with maximum differences up to about 300 m. The largest differences are located in opencast mining areas and result from the different epochs of the DEMs. Histograms of the differences reveal a clear deviation from the normal distribution with a long tail towards too high SRTM3 elevations. The evaluation of GTOPO30 shows that the longitudes should be increased by 30 (one block) in Germany. For the shifted GTOPO30 DEM, the standard deviation of the differences with respect to the best national model is 6.8 m, roughly 75 % smaller than for the original model.
KW - DEM
KW - DEM evaluation
KW - Digital elevation model
KW - GTOPO30
KW - SRTM3
KW - Terrain data
UR - http://www.scopus.com/inward/record.url?scp=84897046752&partnerID=8YFLogxK
U2 - 10.1007/3-540-26932-0_38
DO - 10.1007/3-540-26932-0_38
M3 - Conference contribution
AN - SCOPUS:84897046752
SN - 978-3-540-26930-4
T3 - International Association of Geodesy Symposia
SP - 218
EP - 223
BT - Gravity, Geoid and Space Missions
A2 - Jekeli, Christopher
A2 - Bastos, Luisa
A2 - Fernandes, Joana
ER -