Comparison of Integrating GF-7 and ICESat-2 Laser Altimetry Data with High-resolution Stereo Images for Stereo Mapping
Currently, two types of satellite laser altimetry systems are in operation: the full waveform linear system and the single-photon-counting system, which exhibit significant differences in both data format and processing methodologies. It remains uncertain which satellite laser altimetry technology o...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2025-07-01
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| Series: | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://isprs-annals.copernicus.org/articles/X-G-2025/165/2025/isprs-annals-X-G-2025-165-2025.pdf |
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| Summary: | Currently, two types of satellite laser altimetry systems are in operation: the full waveform linear system and the single-photon-counting system, which exhibit significant differences in both data format and processing methodologies. It remains uncertain which satellite laser altimetry technology offers greater advantages in assisting stereo mapping of high-resolution optical imagery. To evaluate the effectiveness of those two satellite laser altimetry technologies in supporting optical imagery stereo mapping, this study extracted laser elevation control points from both GF-7 satellite and ICESat-2 laser altimetry data, and designed a specialized bundle adjustment workflow for GF-7 satellite stereo images incorporating laser elevation control points. Comparative experiments were conducted across both flat and mountainous regions. Results demonstrate that laser elevation control points derived from both GF-7 satellite and ICESat-2 effectively improved the elevation accuracy of stereo mapping of GF-7 satellite images. However, the ICESat- 2 laser altimetry data has advantages in quantity and distribution, and the combined bundle adjustment accuracy of the two survey areas is slightly better than that of the GF-7 satellite laser altimetry data. |
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| ISSN: | 2194-9042 2194-9050 |