12 May 2005 The technique of satellite cross-calibration for ocean color sensors (Invited Paper)
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Proceedings Volume 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies; (2005) https://doi.org/10.1117/12.619657
Event: Optical Technologies for Atmospheric, Ocean, and Environmental Studies, 2004, Beijing, China
Abstract
The one of the most important technique of satellite ocean color remote sensing is the radiance measurement accuracy because the water leaving radiance is only about 5% to 10% of the total radiance arrived at sensor at the satellite altitude. It is necessary to guarantee the accuracy of water leaving radiance measurement of about 5%(relative error) to meet the reversed accuracy of ocean color factors (such as chlorophyll suspended material and so on) within relative error about 30 in open sea (Case I water). When sensor has been in the orbit it is important to take orbit calibration to make up some deficits of the pre-launch calibration in the laboratory. Two kinds of data could be used for orbit calibration one is in-situ measurement date so-called in-situ field calibration and another is other satellite data with higher radiance measurement accuracy so called crossing-calibration. China has launched the third spaceship SZ-3 in March 2002. The main remote sensing sensor is the Chinese Moderate Imaging Spectroradiometer (CMODIS) which has total 34 channels (30 channels of 2Onm interval in the spectral range of 0.403-1.O43μm and four infrared channels with 2.15-2.25um, 8.4-8.5um, 10.3-11.3um and 11.5-12.5um. Following SZ-3 China had the first ocean color satellite HY-1A in May of the same year whose main sensor is for ocean color measurement, called as Chinese Ocean Color and Temperature Scanner, COCTS, providing 8 visible and near-infrared channels similar to SeaWiFS. In this paper, first, the methodology and procedure of satellite cross-calibration are discussed in detail, with taking an example of CMODIS. Then the results of this orbit cross-calibrated by American ocean sensor, Sea Wide Field-of-View Sensor (SeaWiFS), for CMODIS and COCTS are presented with comparing the normarization from pre-lunched Lab-calibration and in-situ measurement.
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Delu Pan, Xianqiang He, Qiankun Zhu, Tianming Mao, "The technique of satellite cross-calibration for ocean color sensors (Invited Paper)", Proc. SPIE 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies, (12 May 2005); doi: 10.1117/12.619657; https://doi.org/10.1117/12.619657
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