Comparison of the Cross-calibration Methods between Image-based and RTM-BRDF for GF-1 Images

• Main Authors: LI Juan, FENG Lian, PANG Xiaoping
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2017-07-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: Gaofen-1 satellite; cross-calibration; relative spectral response; USGS spectral library; aerosol; radiative transfer model; BRDF
• Online Access: http://html.rhhz.net/CHXB/html/2017-7-882.htm
• ISSN: 1001-1595; 1001-1595

Four wide-field-of-view (WFV) instruments are on board the Gaofen-1 (or GF-1) satellite, providing a combined swath of ~800 km. Before appling to quantitative remote sensing, precision radiometric calibration is needed. Currently, there are two cross-calibration methods. One is the traditional cross-calibration method (image-based), the other is based on radiative transfer model and bidirectional reflectance distribution function(RTM-BRDF). In this study, the two methods were used to cross-calibrate the WFVs of GF-1, and the comparisons were made at the same time. The verification based on satellite data and in situ measurements have shown that, for the two approximately nadir imaging camera WFV2 and WFV3, Image-based method could get higher precision radiometric calibration coefficients, while for two non-nadir imaging cameras WFV1 and WFV4, high precision calibration coefficients would be obtained by the RTM-BRDF method. Finally, the calibration coefficients of GF-1 was derived by the combination of the two methods.