1

In order to run a hydrologigal analysis I'd like to to merge two raster datasets (DEM and buildings) to get as result one raster with only the highest values (elevations) of both. In other words: To overlay the DEM with the buildings and to use the buildings-values whenever possible.

I'm working with ArcGIS 10.4 (ArcMap/ArcScene) for this.

I've got the following input data:

  • DEM as raster
  • builidungs as raster (with Null-values outside the buildings)

I was wondering if its possible to use an IF-statement in the Map Algebra Tool, but didn't get the right syntax or maybe there is a better way to do it. The If-statement could be similar to this: If ("buildings1" IS Null, "DEM1")

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3

You can do this just by using the Mosaic to New Raster geoprocessing tool. Just choose maximum for your Mosaic Operator and the new raster will use the high value anywhere that they overlap.

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