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hi dnandz.. im just want to doing some research about this... I have etracted water depth from spot 5 image by using y=mx+c whre m and c is constant and x=(band 1-band3)/band 1+ band 3) by considering band 1 and 3 is suitable to extract water depth.... Value salinty has been measure. that mean i have salinity value that measure from water sample on the ground... i have i mathematc formulae for salinty that realated to the water depth.. s bot= s deep ( 1-exp((d^2/2.25)*1/2)) where s bot= bottom salinty s deep= the maximum salinty in depest parts of the estuary D= Depth.... Hope u can help me about this research...

Well, its funny. After almost lost all my hair, I figure that when I got the landsat 8 images on the "wrong" projection (wgs_84_zone_23N) that somehow messed my data frame extent. Since I like to work with the data frame "clipped" to the region of my interest by a polygon,and yesterday I shut of this option, today I clipped the data frame again and the shape opened "on the fly" in the right extent..... Finally. Thanks!!