~1 min read


  1. Download the flow direction file (FDR) from here (Wu, et. al. 2012) then import it into ARCGIS. Capture

  2. Using “Basin” tool to identify the basins and then convert the generated raster to polygons. Capture

  3. Select the desired basin and output the polygon as a single file (Mekong Basin here). Capture

  4. Use “extract by mask” to extract the flow direction for the desired basin. Capture

  5. Export the flow direction as ascii