標題: ACCURACY EVALUATION OF ALOS DEM WITH AIRBORNE LIDAR DATA IN SOUTHERN TAIWAN
作者: Liu, Jin-King
Chang, Kuan-Tsung
Lin, Chinsu
Chang, Liang-Cheng
土木工程學系
Department of Civil Engineering
關鍵字: ALOS DEM;Terrain features;Positional accuracy;Airborne LiDAR;Geomorphometry
公開日期: 2015
摘要: Recently, some global-scale DEM products, such as GTOPO30, ETOPO1, SRTM and ASTER GDEM have been published for geoscience applications. The latest product, ALOS DEM was announced to be available for a global coverage in 2016. This study examined the performance of ALOS-DEM in describing accurate morphometric and volumetric measurement of land features. A comparison was made on basis of DEM and DSM data of airborne fullwaveform LiDAR data. Results showed that ALOS DEM is more approximately in reality an ALOS DSM which reveals the ground envelop surface rather than the ground bare surface. The differences between ALOS DEM and LiDAR DSM are mainly from 0 to 2.75 m with a standard deviation of 1.58 m. The differences between ALOS DEM and LiDAR DEM give a bias of as large as 20m, mostly located at the areas with abrupt change of relief and mainly in the northfacing slopes. This is probably due to ALOS sensor\'s geometry in corresponding to its looking-direction. The stream networks derived from both ALOS DEM and LiDAR DEM are in good agreement. It is suggested that further studies on methods for assessing geomorphometric changes in landform structures should be developed and compared.
URI: http://hdl.handle.net/11536/134579
ISBN: 978-1-4799-7929-5
ISSN: 2153-6996
期刊: 2015 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS)
起始頁: 3025
結束頁: 3028
Appears in Collections:Conferences Paper