I am trying to locate areas upstream and downstream of a point of interest in QGIS in order to determine possible areas of origin upstream and areas of impact downstream. I have used a DEM to create watersheds and am now using the SAGA Upslope Area tool. I have populated the X and Y fields with the coordinates of a dummy point and used the filled DEM for the Elevation field. When I run the algorithm, however, the result is always the entirety of whatever I selected for the Target Area field.

closed as off-topic by PolyGeo Oct 26 '17 at 7:33

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