Abstract
Abstract. Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM), one of onboard sensors carried by Advanced Land Observing Satellite (ALOS), was designed to generate worldwide topographic data with its optical stereoscopic observation. It has an exclusive ability to perform a triplet stereo observation which views forward, nadir, and backward along the satellite track in 2.5 m ground resolution, and collected its derived images all over the world during the mission life of the satellite from 2006 through 2011. A new project, which generates global elevation datasets with the image archives, was started in 2014. The data is processed in unprecedented 5 m grid spacing utilizing the original triplet stereo images in 2.5 m resolution. As the number of processed data is growing steadily so that the global land areas are almost covered, a trend of global data qualities became apparent. This paper reports on up-to-date results of the validations for the accuracy of data products as well as the status of data coverage in global areas. The accuracies and error characteristics of datasets are analyzed by the comparison with existing global datasets such as Ice, Cloud, and land Elevation Satellite (ICESat) data, as well as ground control points (GCPs) and the reference Digital Elevation Model (DEM) derived from the airborne Light Detection and Ranging (LiDAR).
Highlights
The Digital Elevation Model (DEM) which represents the 3-D information on the ground is one of essential layers in the field of geographic information systems
The global elevation data derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER/GDEM) derived from the optical stereo sensors was released in 2009 first
The accuracies and error characteristics of datasets are analyzed by the comparison with existing global datasets such as Ice, Cloud, and land Elevation Satellite (ICESat) data, as well as with Ground Control Points (GCPs) and a reference airborne Light Detection and Ranging (LiDAR)/DEM
Summary
The Digital Elevation Model (DEM) which represents the 3-D information on the ground is one of essential layers in the field of geographic information systems. The global elevation data derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER/GDEM) derived from the optical stereo sensors was released in 2009 first. It has the height accuracy of 13 m (1 ) in 1 arcsec (30 m) pixel spacing (Tachikawa et al, 2011). To utilize the global data archives observed during the five year mission life of the sensor we started to generate new global elevation datasets, named ‘Advanced World 3D (AW3D)’, which have finer ground resolution and higher accuracy than those existing ones (Takaku et al, 2014). The accuracies and error characteristics of datasets are analyzed by the comparison with existing global datasets such as Ice, Cloud, and land Elevation Satellite (ICESat) data, as well as with Ground Control Points (GCPs) and a reference airborne LiDAR/DEM
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