topic Extracting cells using a categorical raster with raster calculator in ArcGIS Spatial Analyst Questions

Extracting cells using a categorical raster with raster calculator

SusanneWagner — Sun, 20 Sep 2015 17:23:32 GMT

Hello,

I have some problems for a raster query. Can somebody help me please?

I have 2 raster files: parcels with different id (1-7) and landuse also with different ids 1-4).

I want to use the raster calculator for query to create an own raster layer with parcel == 2 and including all kind of landuse (1-4) which exists on those parcels....

But I don't know how to form that query. I tried it with pick and con but without success.....

Thanks in advance!!!

Re: raster calculator

DanPatterson_Retired — Sun, 20 Sep 2015 18:45:49 GMT

Use the Combine tool which will produce all the unique combinations which is more useful that doing one query at a time.

http://desktop.arcgis.com/en/desktop/latest/tools/spatial-analyst-toolbox/combine.htm

Re: raster calculator

GabrielUpchurch1 — Tue, 22 Sep 2015 18:50:44 GMT

In addition to Dan's suggestion (which should do what you need), this map algebra expression applied in Raster Calculator should yield all of the land use cells that overlap with Parcel 2 cells:

Con("Parcels" == 2,"Landuse",SetNull("Parcels","Landuse"))

Alternatively, instead of setting all of the parcel cells not equal to 2 to NoData, you could simply set them to 0. It just depends on your needs. Here is that syntax:

Con("Parcels" == 2,"Landuse",0)

Re: raster calculator

curtvprice — Tue, 06 Oct 2015 02:24:05 GMT

If you don't apply a false expression, you get NoData, so this will work:

Con("Parcels" == 2, "Landuse")

Re: raster calculator

SusanneWagner — Wed, 07 Oct 2015 12:18:55 GMT

Thank you for all help!!!