Volume XLII-3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 143-146, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-143-2018
© 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, 143-146, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-143-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Apr 2018

30 Apr 2018

POLARIMETRIC CALIBRATION AND ASSESSMENT OF GF-3 IMAGES IN STEPPE

Y. Chang1, J. Yang1, P. Li1, L. Shi1, and L. Zhao2,3 Y. Chang et al.
  • 1State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, 430079, China
  • 2School of Remote Sensing and Information Engineering, Wuhan University, 430079, China
  • 3Beijing Key Laboratory of Urban Spatial Information Engineering, 100038, China

Keywords: Polarimetric calibration, PolSAR; GF-3, image quality, reflection symmetry

Abstract. The GaoFen-3 (GF-3) satellite is the first fully polarimetric synthetic aperture radar (PolSAR) satellite in China. It has three fully polarimetric imaging modes and is available for many applications. The system has been taken on several calibration experiments after the launch in Inner Mongolia by the Institute of Electronics, Chinese Academy of Sciences (IECAS), and the polarimetric calibration (PolCAL) strategy of GF-3 are also improved. Therefore, it is necessary to assess the image quality before any further applications. In this paper, we evaluated the polarimetric residual errors of GF-3 images that acquired in July 2017 in a steppe site. The results shows that the crosstalk of these images varies from −36 dB to −46 dB, and the channel imbalance varies from −0.43 dB to 0.55 dB with angle varying from −1.6 to 3.6 degree. We also made a PolCAL experiment to restrain the polarimetric distortion afterwards, and the polarimetric quality of the image got better after the PolCAL processing.