The Study On Unmixing Of Mixed Pixels Based On Hyperion Data In Fuzhou Region

It is a well-known fact that pixels in remote sensing image are typically mixedpixels due to both the limited spatial resolution of sensors and the heterogeneoussurfaces of ground covers.This paper discuss method for the decomposition of mixedpixels of Hyperion hyperspectral remote sensing data by feat of fuzhou city people’spark surrounding area of Hyperion hyperspectral image.There are two difficult pointsabout mixed pixels unmixing:(1)Determine and pick-up the end members;(2)solve themodle of mixed pixels unmixing.For the characteristics of Hyperion hyperspectral remote sensing data, at first thepaper pretreated Hyperion image and provide the guarantee for further analytical andactual application image.With the premise of assuring pixel immixing model,wethergood or bad it is,the choice of endmembers directly influence accuracy of pixelunmixing.Through comparing and analyzing relative merits of endmemberextraction,select PPI method,simultaneously,build spectral library of researchedarea.Finally,confirm spectrum value by the mean of combining reference endmemberwith image endmember.At last this paper summarizes the decomposition model ofmixed pixels,select linear model of unmixing model,in view of ENVI linear spectralunmixing causing part abundance value is less than0and greater than1,so,this paperused the optimization function of IDL to realize the negative least squares,in themeantime by means of normalization.This way,the abundance value is between0and1.By idl programming,realize the mixed pixels linear decomposition,obtains eachendmember percentage of mixed pixels,also can get abundance chart of endmember.