Atmosphere Correction of Multi-angle NOAA Data Based on BRDF Reflectance
多角度NOAA卫星数据地面BRDF反射率的大气校正

The atmosphere correction ofmulti-angle remote sensing should considerthe atmosphere-surface coupled sys- tem and iterative inversion to calculate the coupled factor.This papermakes use ofRahmanBRDFmodel and the iterative BRDFatmospheric correctionmethod forNOAAsatellite data to obtainmulti-angle atmosphere corrected images. The ex- periment has proved the feasibility of applying the MODIS atmosphere correction method to existing multi-angle NOAA satellite data. Spectral curves afterBRDFatmosphere correction match the surface curves mostly and the iteration con- verges fast. Under find weather condition, the error is very small after only one iteration. By comparison, the difference of image reflectance between the original image and the image afterBRDFatmosphere correction can reach 30%. The variation trend of original image s reflectance is different greatly from the measuring value of ground alongwith the angle changing. This result shows thatBRDFatmosphere correction is indispensable,and even that the NOAA satellite data should not be used to quantitative remote sensing research,if it have not been corrected for atmosphere. Now, obtaining multi-angle satellite remote sensing data exists a lot of difficulty, and the atmosphere correction is an indispensable step in multi-angle remote sesing application for present obtainable abundance NOAA data.All these are only preliminary ex- perimental results, and there still are some problems needed to do further study.For example, under bad weather condi- tion,whatwill be the atmosphere correction result? It otherBRDFmodes such as Ambrals are adopted, will the atmo- sphere correction result be the samewith the Rahman s? These also need the researchs onmulti-angle remote sensingthe- ory to do futher study.