Mean value from raster to polygons

Discussion created by on May 16, 2013
Latest reply on May 16, 2013 by cblinnmrc
I have raster data of a forest age in an area. The area is divided into polygons because of its diverse nature. I would like to obtain a generalized mean forest age in each polygon. How can I most easily carry out such an operation. What I find is to convert raster to shap files and then do a spatial join ... But there must be a better approach?

Some parts of the polygons, in many cases, large portions, consisting of no data on the matter.

Grateful for answers.