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polygon cell statistics

Question asked by helenak on Jun 6, 2012
Latest reply on Jun 12, 2012 by m.gasior
System: ArcGIS 9.3
Dataset:
1. polygons of 3000 grid cells, each containing the average annual temperature of the grid cell
2. tree distribution map for 5 species (polygons) (species 1 to 5)

Purpose
I want to know the average annual temperature of the ranges of species 1 to 5.
Also, I want to compare if there is any difference in average annual temperature between the species distribution.

Procedure:
Step 1:
Clip the grid cell polygons using the distribution maps of the five tree species respectively.

Step 2: calculate the average of the annual temperature of the clipped polygons from species 1 to 5

Problem:
Please kindly advise which method in ArcGIS 9.3 can perform step 2 for polygons.
Also, please kindly advise if it is possible to be written in python for automation for more than 100 tree species.
Thank you in advance.

(Once zonal statistics was suggested.
However, it was based on raster.
I tried it but found this was time and space-consuming
to transfer polygons to raster based on fine-scale.)

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