Abstract
Abstract. Topographical information is fundamental to many geo-spatial related information and applications on Earth. Remote sensing satellites have the advantage in such fields because they are capable of global observation and repeatedly. Several satellite-based digital elevation datasets were provided to examine global terrains with medium resolutions e.g. the Shuttle Radar Topography Mission (SRTM), the global digital elevation model by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER GDEM). A new global digital surface model (DSM) dataset using the archived data of the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) onboard the Advanced Land Observing Satellite (ALOS, nicknamed “Daichi”) has been completed on March 2016 by Japan Aerospace Exploration Agency (JAXA) collaborating with NTT DATA Corp. and Remote Sensing Technology Center, Japan. This project is called “ALOS World 3D” (AW3D), and its dataset consists of the global DSM dataset with 0.15 arcsec. pixel spacing (approx. 5 m mesh) and ortho-rectified PRISM image with 2.5 m resolution. JAXA is also processing the global DSM with 1 arcsec. spacing (approx. 30 m mesh) based on the AW3D DSM dataset, and partially releasing it free of charge, which calls “ALOS World 3D 30 m mesh” (AW3D30). The global AW3D30 dataset will be released on May 2016. This paper describes the processing status, a preliminary validation result of the AW3D30 DSM dataset, and its public release status. As a summary of the preliminary validation of AW3D30 DSM, 4.40 m (RMSE) of the height accuracy of the dataset was confirmed using 5,121 independent check points distributed in the world.
Highlights
Topographical information is fundamental to many geo-spatial information and applications on the Earth
The Shuttle Radar Topography Mission (SRTM), which is spearheaded by the National Aeronautics and Space Administration (NASA) and the National Geospatial-Intelligence Agency (NGA) of the United States (Farr et al, 2007), has operated in 2000 and generated digital elevation model (DEM) with originally 3 arcsec. spacing covered latitude regions within +/-60 degrees
The absolute height validation of ALOS World 3D m mesh” (AW3D30) digital surface model (DSM) datasets were conducted using 5,121 CPs distributed in 127 tiles that located in Japan area and foreign countries
Summary
Topographical information is fundamental to many geo-spatial information and applications on the Earth. Another dataset is the global DEM (GDEM), which used data acquired by the Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER GDEM), was released in 2009 by NASA and the Ministry of Economy, Trade and Industry (METI), Japan, and a second version was released in 2011 (Tachikawa et al, 2011). Remote Sensing Technology Centre of Japan (RESTEC) in 2013 This project is named “ALOS World 3D” (AW3D), and the dataset created consists of fine resolution DSM > 70 > 0.2 -1.2 / +1.2 degrees (OB1, NDR) 8 bits/pixel 960 Mbps (OB1, OB2) Lossy, JPEG extension (onboard) 240 Mbps (1/4.5 compression)
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