topic Re: Filling voids in DEM in ArcGIS Spatial Analyst Questions

Filling voids in DEM

andylohmann — Thu, 16 Jun 2016 21:35:55 GMT

I recently downloaded a DEM and it has several voids in it. There is not a pixel where there should be. Is there a way I can fill these with reasonable data using arc maps 10.3?

Re: Filling voids in DEM

DarrenWiens2 — Thu, 16 Jun 2016 21:41:54 GMT

See this help page that shows how to use Nibble to fill voids.

Re: Filling voids in DEM

JayantaPoddar — Fri, 17 Jun 2016 07:27:14 GMT

I hope this method will also work:

First, use Focal Statistics—Help | ArcGIS for Desktop using the above DEM to create an interpolated raster. This raster will also have the NoData values filled.

Next, use Raster Calculator—Help | ArcGIS for Desktop with the following expression

Con(IsNull("DEMRASTER"),"FOCALRASTER", "DEMRASTER")

The above expression will replace all the NoData values of DEM with the pixel values of the Focal-Statistics Output Raster.

Re: Filling voids in DEM

DanPatterson_Retired — Fri, 17 Jun 2016 07:59:43 GMT

for pixel sized holes normally (depends on window used)... for larger holes, the regiongroup, nibble combination is the way to go

Re: Filling voids in DEM

Robert_LeClair — Mon, 20 Jun 2016 22:18:08 GMT

The Fill (Spatial Analyst) GP tool may be worth a look as well.

Re: Filling voids in DEM

XanderBakker — Sun, 14 Aug 2016 03:55:01 GMT

For small areas with NoData I would go for the solution provided by Jayanta Poddar (but using the two steps in a single raster calculator expression). For larger areas in the past I have used a procedure to:

detect the NoData Areas
expand the NoData Areas
use the expanded raster to get the border with values of the DEM
convert that raster into points
create a TIN
convert to raster and replace the NoData values with the TIN 2 raster result

However, these are a lot of steps and what is most important, if you have a large area of NoData values, you probably don't know what happens there and any method will assume things that may not be true.