Precise Global DEM Generation by ALOS PRISM

Abstract

The Japan Aerospace Exploration Agency (JAXA) generated the global digital elevation/surface model (DEM/DSM) and orthorectified image (ORI) using the archived data of the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) onboard the Advanced Land Observing Satellite (ALOS, nicknamed "<i>Daichi</i>"), which was operated from 2006 to 2011. <br><br> PRISM consisted of three panchromatic radiometers that acquired along-track stereo images. It had a spatial resolution of 2.5 m in the nadir-looking radiometer and achieved global coverage, making it a suitable potential candidate for precise global DSM and ORI generation. In the past 10 years or so, JAXA has conducted the calibration of the system corrected standard products of PRISM in order to improve absolute accuracies as well as to validate the high-level products such as DSM and ORI. <br><br> In this paper, we introduce an overview of the global DEM/DSM dataset generation project, including a summary of ALOS and PRISM, in addition to the global data archive status. It is also necessary to consider data processing strategies, since the processing capabilities of the level 1 standard product and the high-level products must be developed in terms of both hardware and software to achieve the project aims. The automatic DSM/ORI processing software and its test processing results are also described.

Vertical Accuracy Assessment of 30-M Resolution Alos, Aster, and SRTM Global Dems Over Northeastern Mindanao, Philippines

“…AW3D30 was generated using the traditional optical stereo matching technique as applied to images acquired by the Panchromatic Remotesensing Instrument for Stereo Mapping (PRISM) sensor onboard the Advanced Land Observing Satellite (ALOS) (Takaku et al, 2014). Details on how the DEM was generated are discussed in the papers of Tadono et al (2014) and Takaku et al (2014). Due to its very recent release, studies assessing the vertical accuracy of AW3D30 are few or are yet to be reported.…”

Improving the Accuracy of Estimated 3d Positions Using Multi-Temporal Alos/Prism Triplet Images

“…Experimental results for five sets of PRISM triplet images showed that the planimetric and height errors of the coordinates estimated by using multitemporal triplet images were 3.26 m and 2.71 m, respectively, and that they were smaller than those generated by using each set of triplet images alone. These results are better than those achieved by stacking and mosaicking multi-temporal DSMs (Tadono et al, 2014). In the future, we intend to apply the proposed method to other areas and to generate PRISM-driven DSMs that are more accurate than the existing DSMs.…”

“…During processing, any height bias is detected and removed by referring to a height reference, the Ice, Cloud, and land Elevation Satellite (ICESat) and SRTM version-2 data. The height accuracy of DSMs generated by stacking and mosaicking ranged from about 3.0 m to 6.0 m for most test sites, with a target accuracy of 5.0 m (Tadono et al, 2014). This approach may not be robust to errors because the detection of errors depends on the accuracy of the reference data.…”

Potential and Limitations of Photometric Reconstruction Through a Flock of Dove Cubesats

“…For validation, the ALOS World 3D DEM (AW3D30), a 30 meter resolution digital surface model (Tadono et al, 2014), is used. The estimated azimutal component from this surface model and the photometric estimates are illustrated in figure 4.…”