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Zonal Statistics as Table

Question asked by geonetadmin on Sep 19, 2013
Latest reply on Sep 19, 2013 by TKONG
Original User: Shiko

Hi folks,
So this time I am once again, using Model Builder to run the "Zonal Statistics as Table" tool to create database (.dbf) files.
See model below:
[ATTACH=CONFIG]27583[/ATTACH]

After the model runs, I can access the .dbf files and pull them into excel for further analysis.  For each time it runs with the different tiff layers, the format is as follows:
[ATTACH=CONFIG]27587[/ATTACH]

The issue is that each time I run the model with the different raster (.tif) images, the AREA for the same UNIQ_FIDs is different.
From what I understand about this tool, is that it performs the statistic specified (in this case = MEAN) of all the raster  pixels that it counts within that zone. So I can understand why the COUNT would be different but I don't know why the AREA would change from dbf to dbf?!! Isn't the zone (in this case= polygon referenced by UNIQ_FID) remaining the same? :confused:

Maybe I have the whole Zonal Analysis idea wrong in my mind. Could anyone help me make sense of why the area would be changing.

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