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Using QGIS I'm trying to analyse an area/DEM with this criteria: - heights 10 meter above the river-centerline in both sides of river.

I can do it with the calculation of contours (2m) from DEM and geting the hights of the river-centerline and manually try to draw a line(vector) 10 meters higher than River-Centerline heights (see image below) . But I can't figure out an easy way to filter the boundary area in which the water level of extreme flood cannot reach that hight.

enter image description here

Anyone have any ideas or thoughts on this problem?

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  • There is SAGA Vertical distance to channel network tool. QGIS has it in the Processing Toolbox, but using it in SAGA GUI would be more comfortable. – Kazuhito Jul 5 '18 at 10:55

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