hey guys, 
I have another question. I do not know if it is really stuff for geotools. 

Because the attributeName parameter from VectorToRaster.process() is
numerical, I have to change some elements in my shape file.

These are the facts:
I have a huge amount of colums with String entries. But in reality the
values are not Strings, but numeric entries. What now?
I have to evaluate all entries, if there is a number in it or not. And if
so, how to check on the elements? And then change it to some numeric
entries?!
Has anybody any idea how to do this with less effort?

@michael: did you check already my code from
http://n2.nabble.com/GridCoverage-Error-Points-of-LinearRing-do-not-form-a-closed-linestring-raster-attribute-matrix-tt4783764.html#a4783764.
I send it to you via email.

Thanks for your help
Linda

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