topic Re: Combine and Intersect two rasters in ArcGIS Spatial Analyst Questions

Combine and Intersect two rasters

GwanSeonKim — Thu, 29 Sep 2016 02:46:54 GMT

Hi GIS users,

I have two different rasters as below

First raster shows all green pixels, and second raster shows other color pixels.

I would like to delete pixels if the pixels are located out of green pixels.

I tried to use clip and mask tools, but I could not delete those pixels.

What tool should I used to solve this problem?

Please help me!

Re: Combine and Intersect two rasters

DanPatterson_Retired — Thu, 29 Sep 2016 02:52:20 GMT

The con tool Con—Help | ArcGIS for Desktop

and read the notations

Conditional evaluation with Con—Help | ArcGIS for Desktop

Re: Combine and Intersect two rasters

GwanSeonKim — Thu, 29 Sep 2016 03:28:11 GMT

Thank you so much your response.

I tried used code that Con(("Raster_A" == 1) & ("Raster_B" == 1), 1, 0), and it works OK.

In Raster_A, I have 3 different objectives as shown in attached picture (pixels with Orange, Brown, and Purple colors).

I would like to keep 3 different objectives in Raster_A and just delete pixels if pixels are not located within Raster_B.

I tried to use Con(("Raster_A" == 1) & ("Raster_A" == 2) & ("Raster_A" == 3) & ("Raster_B" == 1), 2, 1, 0), but it gives me an error message. Do you have any ideas to deal with this problem?

Thanks again.

Re: Combine and Intersect two rasters

DanPatterson_Retired — Thu, 29 Sep 2016 03:34:42 GMT

Con(("Raster_A" == 1) & ("Raster_A" == 2) & ("Raster_A" == 3) & ("Raster_B" == 1), 2, 1, 0)

why not if raster_A is <= 3. Also a cell cannot be class 1, 2, 3 all at once which you mean when using & you want 'or' specifically boolean or, not bitwise or

|—Spatial Analyst module | ArcGIS for Desktop that is what | is... it isn't a big i

Re: Combine and Intersect two rasters

JayantaPoddar — Thu, 29 Sep 2016 08:33:08 GMT

What happens if you write the following expression in Raster Calculator?

Con(("RASTER1" > 0), "RASTER2", 0)

where RASTER1 = Green Raster

Raster2 = Multicolour Raster

If required, you can set the NoData Value as 0 in tool Environment setting.

Re: Combine and Intersect two rasters

GwanSeonKim — Thu, 29 Sep 2016 13:16:41 GMT

It works perfectly.

Thank you so much.

Re: Combine and Intersect two rasters

JayantaPoddar — Thu, 29 Sep 2016 16:43:14 GMT

Glad it worked!!!