Radiometric cross-calibration of GF-4 satellite PMS sensor considering the characteristics of multiple integration times

doi:10.11947/j.AGCS.2020.20200057

Abstract

Abstract: Integrating the five integration times characteristics of GF-4 satellite PMS sensor,a radiometric cross-calibration method based on the radiometric block adjustment is proposed. Taking Dunhuang radiometric calibration sites (DRCS) in China as the radiometric transfer platform. Firstly, collecting the valid time-series MODIS images over DRCS to build the BRDF model. Secondly, considering the SBAF and BRDF, the radiometric control points (RCPs) are extracted from the image pairs of Landsat-8 OLI and PMS over DRCS. Thirdly, after setting the restrictive conditions of DN and CV, the radiometric tie points (RTPs) are extracted from PMS images in different integration times under the stare imaging condition. Finally, the radiometric cross-calibration coefficients of five integration times are solved based on the proposed method. The validation results show that the average absolute calibration relative errors of five integration times are all less than 5.18% and the relative radiometric correction errors of five integration times reduce up to 36.64%. Meanwhile, the influences of the RCPs distribution, the restrictive conditions in the process of RTPs extraction, SBAF and BRDF on the calibration results are discussed, which is beneficial to further optimize the radiometric cross-calibration program of PMS.

Key words: GF-4, multiple integration times, radiometric block adjustment, BRDF, SBAF

CLC Number:

P237

HAN Jie, TAO Zui, XIE Yong, LIU Qiyue, SHI Hongbin. Radiometric cross-calibration of GF-4 satellite PMS sensor considering the characteristics of multiple integration times[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(10): 1311-1320.

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