Abstract
Though coastal blue spectrum is used in many domain of earth remote sensing, a majority of multispectral missions are still ignored it. This paper proposed a coastal blue reconstructing method by common-used blue spectrum with ZY-1(02D) data. The reconstructing method was established by three mathematical models: 1) the relation model of surface reflectance based on the responsivities for terrestrial objects; 2) the relation model of apparent radiances based on the radiance transferring model for earth-observing; 3) the relation model of image gray scale based on the imaging theory of multispectral cameras. Comparisons of image digital number and surface reflectance between the reconstructed coastal blue data and raw coastal blue data showed the relative errors of 4.87% with image gray scale and 3.15% with surface reflectance. The results demonstrate the feasibility of reconstructing and expanding spectrum for major multispectral missions without coastal blue.
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