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Raster cell count changes

Roosvan_der_Deijl

Hello there!

Disclaimer: I'm a GIS beginner, so this might be a stupid question, but I haven't found useful help yet on the internet.

Every time I do any calculation on my raster (raster calc, reclassify), the cell counts of the different values as well as the total cell count decrease by a factor (almost exactly) 4. The cell sizes and extent of the maps are the same.

This happens even when simply inputting the raster map into the raster calculator (so just duplicating it).

Does anyone have an explanation for this? I appreciate it, thank you!

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Roosvan_der_Deijl

Extent of original map:

Extent of calculated map:

So it's the same..

When I export the file to a local folder and open it in ArcMap, it AGAIN has counts /4. So really when I do anything to the file it divides all cells counts by 4. I'm so confused now.

PS. It happens with other files as well, so it's not specific to this one.

PPS. I also tried the 'build raster attirubute table' tool to check if that fixes it: no.

Thanks again!!

DanPatterson_Retired

On the first image … 'Extent' tab... that is what I wanted you to check.

You have confirmed that the rows and columns of the inputs are the same. So the Extent and Spatial reference would be useful.

I also notice Dropbox. can you save your rasters to a local folder in *.tif format... just trying to rule out location and file format as well

Roosvan_der_Deijl

Hi Dan, thanks for the fast reply!

Software = ArcMap Desktop 10.6, version 10.6.0.8321, and I'm using the spatial analyst extension.

An example would be the raster 'KK_1990_grid_cellsize60', which layer info looks like:

and top op the attribute table:

When I insert this map into raster calculator, it makes the map "kk_1990_gri1", with layer info

And raster attribute table

where you can see that all count values are 4 times smaller.

Let me know if you'd need more info to understand! Thanks!

DanPatterson_Retired

can you provide an example where the cell sizes and and extent for inputs and outputs are the same. That factor is just too convenient to be a coincidence for all raster tools in arctoolbox

Also software and version and extensions if any would help narrow down those issues

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