Methods for in-scene atmospheric compensation by endmember matching

摘要

Methods are provided for automatically performing atmospheric compensation of a multi or hyper spectral image. One method comprises transforming at least two endmembers extracted from an image into at-ground reflectance. The transformation may be approximate and/or only in certain spectral bands in order to reduce processing time. A matching component is then located in a spectral library for each of the at least two extracted endmembers. Gain and offset values are then calculated using the at least two matched extracted endmember and spectral library component pairs. At least part of the image is then compensated using the calculated gain and offset values. Another method uses at least one endmember extracted from the image and a black level. Methods for atmospheric compensation using water vapor content of pixels are also provided. In addition, methods for shadow correction of hyper and multi spectral images are provided.

主权项

1. A method for automatically performing atmospheric compensation of a multi or hyper spectral image, the method comprising:
extracting at least two endmembers from the image; transforming, the at least two extracted endmembers to an at-ground reflectance; finding a matching reflectance component in a spectral library for each of the transformed at least two extracted endmembers, where each extracted endmember and found matching reflectance component taken together form a matched extracted endmember and spectral library component pair; calculating for each of a plurality of spectral bands in the image a gain value and an offset value using the matched extracted endmembers and spectral library component pairs; and compensating at least part of the image using the calculated gain and offset values.