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What is the "Count" field in the attribute table of the Combine Tool

BaileyFredlund1

Hello everyone. I am wondering what exactly the count field is after running the combine tool. I checked out the ArcGIS and ArcPro website helps for this tool but it didn't give me a straight answer. I should probably know this answer... I think it is the count of pixels for each combination created. I want to get a confirmation though so any information will help! Thanks in advance.

Not related to this question but.... I used this tool for a post-classification change analysis. If there is a better way to do this please let me know.

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DanPatterson_Retired

It counts pixels and here is why

Take the result from your combine.

Assume you had a 10m cell size.

Use Copy Raster to copy the raster, but in the Environments section, set the cell size to 5 m (or half of what you have)

The output raster (assuming it is done correctly) will have a cell count 4X the original since you halved the cell size.

The only time cell count will equal area is when you have a 1x1 unit cell size

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DanPatterson_Retired

Combine—Help | ArcGIS Desktop

it is the count of the combinations... technically, since each cell has an area, it also represents the spatial area (ie square meters) and the location where that combination is found

BaileyFredlund1

Okay, I see. So it isnt the pixels? It is already converted to spatial area? Thanks for response!

DanPatterson_Retired

a pixel represents an "area"... aka a square location

now each "area" (aka, pixel) has an 'area' (ie square meters).

so the pixel count represents the "areas" that have those combinations, … say 10 pixels. if each pixel has an area of 3m x 3m, then the 'area' is 90 meters squared.

clear as mud, but rasters are represented by square pixels (usually), each pixel has an area and the total area of an attribute or combination of attributes if 'combined' represents the places where the combination occurs and the 'area' with planar units.

BaileyFredlund1

Hello Dan thanks for reply. I understand the relationship between pixels and areas. Just wondering which one Count is providing. I understand I can do simple calculation if the count is pixels, and do a similar but opposite calculation if the count is square meters. Thanks for your help.

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