topic Re: Zonal Statistics values are different then Statistics in info for my raster in ArcGIS Spatial Analyst Questions

Zonal Statistics values are different then Statistics in info for my raster

DéboraFanzeres — Tue, 11 Mar 2025 14:47:42 GMT

Hi,

I have a raster that when I open it says it goes from 441 to 474, their values. I want to know the sum of the values in that raster, and when I use both zonal statistics or raster layer statistics to see the sum, the min and maximum it gives me is 166 till 621, so I am not sure what happens there and if I can even trust that sum they give me. Anyone can help? Thanks!

Re: Zonal Statistics values are different then Statistics in info for my raster

DanPatterson — Tue, 11 Mar 2025 16:13:56 GMT

how is your zone or zones defined? and doe the raster extent and zonal extents match?

How zonal statistics tools work—ArcGIS Pro | Documentation

Re: Zonal Statistics values are different then Statistics in info for my raster

David_Brooks — Tue, 11 Mar 2025 16:32:57 GMT

@DéboraFanzeres and have you built raster statistics on the raster dataset itself? it might be that the 441-474 values are an estimate

Re: Zonal Statistics values are different then Statistics in info for my raster

DavidPike — Tue, 11 Mar 2025 20:29:02 GMT

The layer statistics are calculated from a sample with a skip factor. It's possibly these values have been skipped. I would use the calculate statistics tool with a value of 1. That will update the dataset properties and then you can properly compare.