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hugacedar
(Stranger )
02/12/06 06:00 PM
Dark Object Subtraction for Landsat Report this article as Inappropriate to us !!!Login to Reply

I am having a hard time figuring out how exaclty to do DOS. In the past I just used to locate a dark body of water and minus those values from bands 1,2,3,4,5 & 7. But more recently I heard it is better to look at a histogram and find the point where the DN values rise dramatically and us that as the constant value to subtract from each band. Chavez's method seems too complicated for me.

Also do I need to worry about just bands 1,2 & 3 or all bands.

Please advise ASAP.

Cedar.



rsgis_pe
(Stranger )
01/19/07 12:06 PM
Re: Dark Object Subtraction for Landsat new [re: hugacedar]Report this article as Inappropriate to us !!!Login to Reply

yeah it is a simple method, but I recommend to you use the "CosT" method proposed by Chavez too, in the ERDAS website there are a model maker created for accomplish that.




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