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August 2006

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2006.08.18 20:04 "help about tiff", by Fayssal James

hello
my name's fayssal and am a student working on a project in order to handle 
geotiff images that are provided by MSG to the spatial researches center in 
morocco and as you probably know the images are classified by channels,there 
are seven and i am interested in channel 1 and 3 so i can realise the 
discrimination of snow and its temporal progress.so i managed to calculate 
the NDSI (normalised difference snow index) wich is in fact p1-p3/p1+p3 
where as p1 and p3 are the values of the pixel p in channel 1 and 3 where 
the images are in gray 16 bits
my problem consists in the use of geotiff library and how to get the value 
of pixels and calculate the NDSI i would be glad if you can provide me any 
help

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