Extend VectorToRasterProcess options
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                 Key: GEOT-3007
                 URL: http://jira.codehaus.org/browse/GEOT-3007
             Project: GeoTools
          Issue Type: Improvement
            Reporter: Michael Bedward
            Assignee: Michael Bedward
             Fix For: 2.6.3, 2.7-M0


At the moment the VectorToRasterProcess class uses an attributeName parameter 
to get a numeric value from each feature that is used for the corresponding 
cell values in the output raster.

Add the ability to pass an org.geoapi.filter.Expression parameter that can be 
evaluated to a numeric value to allow for feature value recoding, interpolation 
etc. as well as generating unique integer ID values from featureIds so that the 
output raster can be linked to a table of other attributes.




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