topic Re: Create 3D Flood Level from Raster inconsistent results in ArcGIS Solutions Questions

Create 3D Flood Level from Raster inconsistent results

Joshua-Young — Wed, 23 Jul 2025 15:43:07 GMT

I am trying to create a 3D visualization of the recent flood here in Kerrville, TX. I was able to create a water surface elevation (WSE) raster from local DEMs and a depth raster but I had to split the WSE raster to get it to run successfully in the Create 3D Flood Level from Raster script provided by the solution. The problem is one section of the 3D poly/multipatch will be at the correct elevation and broken into many polygons, but the next section will be one large polygon and 100+ feet higher than the previous or next section.

I tried rerunning one of the incorrect sections and got the same results. I am going to try again with smaller sections but last time it took 28 hours to run the entire area.

Is there a trick to getting this tool to run correctly? Is this a bug in the script?

Re: Create 3D Flood Level from Raster inconsistent results

Joshua-Young — Wed, 23 Jul 2025 16:33:38 GMT

I re-ran a small area after splitting the raster to 1024x1024 tiles and now I get the results I am expecting. Below you can see the difference between the 5120x5120 tile split and the new split outputs.

Also, does anyone know of a way to not have gaps between the split rasters? It looks like the Create 3D Flood Level from Raster tool is doing an interior buffer at somewhere in the process.

Re: Create 3D Flood Level from Raster inconsistent results

Joshua-Young — Thu, 24 Jul 2025 15:18:24 GMT

I ended up re-splitting the rasters by 2048x2048 pixels with an overlap of 50 pixels, then ran it through the Create 3D Flood Level from Raster, and finally merged the output together. As far as I can tell the output is correct along the entire river corridor, but I am starting to really doubt the outputs of this solution. Hopefully Esri figures out a way to get the Create 3D Flood Level from Raster tool to be able to handle larger areas directly through the tool.