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I'm using ArcGIS 10.2 The summary statistics tool is not functioning in the way that I want. I made an elevation layer that is a DSM, and then in my buildings layer I determined the height for buildings by creating a random points sample. Now that all the random points in each building have an elevation, or z-value, I want to get the mean for each building. I used the summary statistics tool, but it calculates a summarized mean for all 482100 buildings combined. I want the z-mean summarized for each individual building, this is possible because the buildings all have an unique ID number. See Attached Photo,

Z mean value operation

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I think you should consider creating a DEM, and then use zonal statistics as table to generate statistics. You can use a unique field in your building layer to base your statistics on. You then join the table back to your building layer by your unique field.

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  • Did this answer your question? – Barbarossa Nov 18 '13 at 19:14
  • I performed a zonal statistics table operation by inserting my building point elevations as an input raster and the normalized Digital Surface Model (nDSM) as the input value raster, I then set the statistics type as mean. This gave my a zonal statistics mean field. I hope the nDSM is the correct surface to insert. Is the tabular field that resulted a mean calculation of the Z field within Buildings height layer attribute table? – MichaelGEO Nov 18 '13 at 19:43
  • If your nDSM represents elevation, I would use your building polygon as the 'input raster/feature zone data'. Set the 'Zone filed' to a unique id in the building layer. Set 'Input value raster' to the nDSM, specify an output, and select MEAN as stat type. Your table should result in a mean value for each building unique id. – Barbarossa Nov 18 '13 at 20:50

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