Volume XLII-3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 173-177, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-173-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 173-177, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-173-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Apr 2018

30 Apr 2018

PRELIMINARY GAOFEN-3 INSAR DEM ACCURACY ANALYSIS

Q. Chen, T. Li, X. Tang, X. Gao, and X. Zhang Q. Chen et al.
  • Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing, P.R. China

Keywords: GF-3 satellite, error analysis, calibration, digital elevation model, precision validation

Abstract. GF-3 satellite, the first C band and full-polarization SAR satellite of China with spatial resolution of 1 m, was successfully launched in August 2016. We analyze the error sources of GF-3 satellite in this paper, and provide the interferometric calibration model based on range function, Doppler shift equation and interferometric phase function, and interferometric parameters calibrated using the three-dimensional coordinates of ground control points. Then, we conduct the experimental two pairs of images in fine stripmap I mode covering Songshan of Henan Province and Tangshan of Hebei Province, respectively. The DEM data are assessed using SRTM DEM, ICESat-GLAS points, and ground control points database obtained using ZY-3 satellite to validate the accuracy of DEM elevation. The experimental results show that the accuracy of DEM extracted from GF-3 satellite SAR data can meet the requirements of topographic mapping in mountain and alpine regions at the scale of 1 : 50000 in China. Besides, it proves that GF-3 satellite has the potential of interferometry.