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Comparison result of DEM generated from ASTER Stereo Data and SRTM
5. CONCLUTION
This paper describes DEM generation method from ASTER stereo image and evaluates the accuracy of generated ASTER Dem by analyzing height different between ASTER DEM and SRTM DEM. Several results are obtained below:
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DEM with spatial resolution 15 meter can be generated from ASTER stereo image (3n (nadir looking) and 3b (backward looking)) level 1b using Erdas Imagine software (Othobase Pro).
- ASTER DEM that has been generated has mean absolute error up to 27 m (compared to SRTM DEM) with 0-30 m of height difference is covering 67% of land area in the study area. The mean absolute error and percentage of coverage area have lower accuracy than we expected. It is caused by the less of GCPs that be used in the DEM generation process and the most of area study are mountain side with high topography and dense vegetation coverage. Anyway, the accuracy level is not too different compared to the results in previous ASTER research reports (Richard Selby, PCI Geo).
REFERENCES
- ERSDAC, 2002, ASTER User's Guide Part-III (Ver. 1.0), Earth Remote Sensing Data Analysis Center, JAPAN.
- ERSDAC, 2003, ASTER Reference Guide Version 1.0, Earth Remote Sensing Data Analysis Center, JAPAN.
- Goncalves J.A. and Oliveira A.M., 2004, Accuracy analysis of DEMS derived from ASTER imagery, ISPRS XX, Istambul,Turkey.
- Pantelis M. and Ian D., 2004, A rigorous model and DEM generation for SPOT 5-HRS, ISPRS XX, Istambul,Turkey.
- Richard Selby, PCI Geo, Creating digital elevation models and orthoimages from ASTER Imagery, PCI Geomatics, United Kingdom.
- Rob Van Ede, 2004, Destriping and Geometric Correction of an ASTER level 1A Image, Faculty of GeoSciences, Dept. of Physical Geography, Utrecht University
- Tsakiri-Strati M., Georgoula O. and Patias P., 2004, DEM evaluation generated from HRS SPOT 5 data, ISPRS XX, Istambul,Turkey.
- Ulrich K., Tobias B. and Jeffrey O, 2003, DEM generation from ASTER satellite data for geomorphometric analysis of Cerro Sillajhuay Chile/Bolivia, ASPRS 2003 annual conference proceeding, Anchorage, Alaska
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