topic Raster addition where some rasters are null and some have values in Data Management Questions

Raster addition where some rasters are null and some have values

RobJaecks — Mon, 19 May 2014 16:23:42 GMT

I have five rasters with values between 0.1-1 and null values everywhere else. The values on the rasters overlap in some areas, but not everywhere (i.e. two rasters may have a value while the other three are null at a given xy). I want to be able to sum all of the rasters together without ending up with a null value. For example, at a given xy location three of the rasters have a 1 and the other two rasters are null. When I add them together I want a resulting raster with a value of 3 and not null. I think I need to convert the null values to zeroes, but maybe there is an easier way. What's the best way to do this?

Thanks!

Re: Raster addition where some rasters are null and some have values

SteveLynch — Mon, 19 May 2014 19:03:47 GMT

Use the CellStatistics tool

Re: Raster addition where some rasters are null and some have values

RobJaecks — Mon, 19 May 2014 23:25:22 GMT

Thanks that was really easy. For some reason it clipped the output raster to some random small extent, but then I included a zero raster that covered the entire area and that fixed the clipping problem.

Re: Raster addition where some rasters are null and some have values

SteveLynch — Tue, 20 May 2014 14:42:12 GMT

I guess you did not set the processing extent in the environment.

The default is the intersection of the inputs and you would want to use the union.

-Steve

Re: Raster addition where some rasters are null and some have values

RobJaecks — Tue, 20 May 2014 16:51:42 GMT

That did it, thank you!