topic Re: Looking for a comparison tool, opposite to Diff in ArcMap Questions

Looking for a comparison tool, opposite to Diff

AmericaZelada — Tue, 31 Jul 2018 07:49:18 GMT

Hello,

I have two rasters, and I'm looking to perform a pixel-by-pixel comparison.

If Raster A = Raster B, I want the output to be the value of Raster A (or B).

If they are different I want the output to be NaN, or 0.

Basically I need the opposite of Diff:

If the values on the two inputs are different (EQUAL), the value on the first input is output. If the values on the two inputs are the same (DIFFERENT), the output is 0.

Any suggestions?

Thanks very much

EDIT:

I used raster calculator with this statement and it worked.

Con("Raster_1" == "Raster_2","Raster_1",0)

Re: Looking for a comparison tool, opposite to Diff

DanPatterson_Retired — Tue, 31 Jul 2018 08:01:34 GMT

An overview of the Conditional math toolset—Help | ArcGIS Desktop

provides several tools for condition checking. They can be used in combination if needed

You can use the

Set Null—Help | ArcGIS Desktop

Setting values to NoData with Set Null—Help | ArcGIS Desktop

The examples should help.

You might want to look at the

Conditional evaluation with Con—Help | ArcGIS Desktop

Re: Looking for a comparison tool, opposite to Diff

AmericaZelada — Tue, 31 Jul 2018 08:16:50 GMT

Hi Dan,

Thanks for your reply,

I used raster calculator with this statement and it worked.

Con("Raster_1" == "Raster_2","Raster_1",0)

Best regards,

Ame

Re: Looking for a comparison tool, opposite to Diff

DanPatterson_Retired — Tue, 31 Jul 2018 08:34:51 GMT

Good... There are a lot of similar answers on geonet that can be found once the key terms are known.