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@@ -138,7 +138,7 @@ flow. For MFD, drainage indicates the direction of maximum flow.
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The output <b>basin</b> map contains unique label for each watershed
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basin. Each basin will be given a unique positive even integer. Areas
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along edges may not be large enough to create an exterior watershed
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-basin. 0 values indicate that the cell is not part of a complete
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+basin. NULL values indicate that the cell is not part of a complete
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watershed basin in the current geographic region.
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<p>
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