topic Re: Area of connected raster cells with same value in ArcGIS Pro Questions

Area of connected raster cells with same value

another_student — Wed, 30 Oct 2024 13:05:04 GMT

Hi,

I have a raster that describes landcover with 6 classes. I would like to have a new raster that has area of connected cells of same value of the original raster. I know I can use Region Group tool and check the counts of each region. But I need a new area raster that has the areas (or count of cells) of each connected patches as values so that I can Extract Values to Points. How can I do that? Thanks for help!

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Re: Area of connected raster cells with same value

DanPatterson — Wed, 30 Oct 2024 21:01:12 GMT

my first thought would be to use the Count field in the raster table of the resultant regiongroup

Lookup (Spatial Analyst)—ArcGIS Pro | Documentation

essentially you are replacing the existing value field with the count field via a "lookup" table.

Re: Area of connected raster cells with same value

Luke_Pinner — Wed, 30 Oct 2024 21:57:48 GMT

Yes, Region Group then Lookup is how I've done this previously. Though to get area you'll need to multiply the count by pixel area (count * pixel width * pixel height), assuming your raster is in a projected CRS, not geographic.

Re: Area of connected raster cells with same value

another_student — Thu, 31 Oct 2024 07:25:47 GMT

Thank you so much Dan and Luke! Lookup was exactly the tool I was looking for.