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Download the flow direction file (FDR) from here (Wu, et. al. 2012) then import it into ARCGIS.
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Using “Basin” tool to identify the basins and then convert the generated raster to polygons.
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Select the desired basin and output the polygon as a single file (Mekong Basin here).
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Use “extract by mask” to extract the flow direction for the desired basin.
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Export the flow direction as ascii
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