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GIS for Hydrographic Surveying

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Hi All,   I couldn’t figure out if there is a way to derive rivers from the contour lines. I tried to convert a contour to dem by using the Create Tin, tin to Raster tools.   Then, I used the following tools in this order: Fill Flow direction Flow accumulation Raster calculation (setnull ("flowaccumulation",0)) Raster to polyline   But… (Show more)