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Last Post 04 Aug 2012 09:50 AM by  anon
Problem with REIP
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anon



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04 Aug 2012 09:50 AM
    Hi, I have problem with calculation Red Edge Inflection Point. I need to calculate it for my WorldView-2 image. At first I orthorectified this image and than I used Quick Atmospheric Correction, so it should be reflectance now. I want to calculate REIP, I tried this options: 700.0 + ( ( ( ( float (b3) + float (b4) ) / 2.0 ) - float (b3) ) * 40.0 ) * ( 1 / ( float (b4) - float (b3) ) ) ((((((b3+b4)/2)-b3)/(b4-b3))*40)+700) After using the first formula I get the image with value 720.00 on the whole area of image. After using the second formula I get 700 everywhere. I dont understand what's wrong. Can anybody help me please? Thanx.

    MariM



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    06 Aug 2012 08:12 AM
    A good way to check your results is to pick a single pixel from the bands you need and perform the calculation manually to see if you also come up with the same result. If you do, then there is a problem with the data. If not then there is a problem with the band math equation. I don't actually think you have appropriate spectral resolution with WV2 data to calculate this index. It requires narrow bands of 667, 782, 702 and 738nm.
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