A Planimetric Location Method for Laser Footprints of the Chinese Gaofen-7 Satellite Using Laser Spot Center Detection and Image Matching to Stereo Image Product
- 1 February 2021
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Geoscience and Remote Sensing
- Vol. 59 (11), 9758-9771
- https://doi.org/10.1109/tgrs.2020.3048042
Abstract
Satellite stereo mapping, together with laser altimetry, can be used to obtain three-dimensional geospatial information. Spaceborne laser altimeter can provide high-accuracy elevation information; however, due to the lack of detailed intensity information, its planimetric accuracy is usually worse than the ranging accuracy. The Chinese Gaofen-7 (GF-7) satellite, which was designed for civilian mapping application, was launched on November 3, 2019. The GF-7 satellite's main payloads are a laser altimeter system (with footprint camera) and a dual-linear charge-coupled device (CCD) mapping camera. According to the pixel coordinate of the laser footprint in the stereo image, the laser altimeter together with the footprint camera can provide planimetric geodetic coordinates for the control points of a higher accuracy than the other traditional satellite laser altimeters, and represents a new technology for satellite mapping. In this article, a laser footprint planimetric location method for the GF-7 satellite is proposed. The method is designed based on the main payload characteristics of GF-7 and the working modes of the laser altimeter by the combined use of subpixel phase correlation image matching and four types of laser spot center detection methods. The planimetric positioning accuracies of the laser spots in urban, suburban, farmland, forest, mountainous, and ice sheet areas were also analyzed. The experimental results show that the accuracy of planimetric location relative to stereo image for the laser footprint is 0.3-1.0 m (except for ice sheets ~12 m) when the footprint camera works under the synchronous mode, and 0.2-0.4 m when the footprint camera works under asynchronous mode (AM).Keywords
Funding Information
- National Natural Science Foundation of China (41822106, 41571407)
- National High Resolution Ground Observation System of China (11-Y20A12-9001-17/18)
- Shanghai Science and Technology Innovation Action Plan Program (18511102100)
- Shanghai Dawn Scholar program (18SG22)
- State Key Laboratory of Disaster Reduction in Civil Engineering (SLDRCE19-B-35)
- Opening Foundation of Hunan Engineering and Research Center of Natural Resource Investigation and Monitoring (2020-8)
- Fundamental Research Funds for the Central Universities of China
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