Abstract
This study described the on-orbit vicarious radiometric calibration of Chinese civilian high-resolution stereo mapping satellite ZY3-02 multispectral imager (MUX). The calibration was based on gray-scale permanent artificial targets, and multiple radiometric calibration tarpaulins (tarps) using a reflectance-based approach between July and September 2016 at Baotou calibration site in China was described. The calibration results reveal a good linear relationship between DN and TOA radiances of ZY3-02 MUX. The uncertainty of this radiometric calibration was 4.33%, indicating that radiometric coefficients of ZY3-02 MUX are reliable. A detailed discussion on the validation analysis of the comparison results between the different radiometric calibration coefficients is presented in this paper. To further validate the reliability of the three coefficients, the calibrated ZY3-02 MUX was compared with Landsat-8 Operational Land Imager (OLI). The results also indicate that radiometric characteristics of ZY3-02 MUX imagery are reliable and highly accurate for quantitative applications.
Highlights
The Ziyuan-3 (ZY3) satellite constellation is China’s civilian high-resolution stereo mapping satellite system, consisting of four satellites: ZY3-01, ZY3-02, ZY3-03, and ZY3-04
The multispectral imagery provides repetitive acquisition of multispectral data with a high resolution of 5.8 m, while panchromatic imagery of 2.1-m resolution is mainly used for 1:50,000 scale topographic mapping
Most studies of the ZY3-01 and ZY3-02 satellites have focused on geometric calibration, and minimal work has been performed on the radiometric calibration and validation, while quantitative applications such as surface albedo retrieval and aerosol parameter retrievals of ZY-01 and ZY-03 images require reliable radiometric information
Summary
The Ziyuan-3 (ZY3) satellite constellation is China’s civilian high-resolution stereo mapping satellite system, consisting of four satellites: ZY3-01, ZY3-02, ZY3-03, and ZY3-04. The primary purpose of the ZY3 satellite constellation is to satisfy China’s need for satellite imagery for surveying and mapping and the geographic information system industry. Most studies of the ZY3-01 and ZY3-02 satellites have focused on geometric calibration, and minimal work has been performed on the radiometric calibration and validation, while quantitative applications such as surface albedo retrieval and aerosol parameter retrievals of ZY-01 and ZY-03 images require reliable radiometric information. Since the launch of ZY3-02, ZY3 satellite products have successfully played an important role in China’s environmental, agricultural, and other quantitative applications, which require reliable radiometric information
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