Hi Andrea,
here is an example from both. The differences seem to be names (of every 
single parameter - PROJCS, GEOGCS, SPHEROID, etc), including 
captialization and parameter naems.
The values seem to be identical.
Hope this helps,
Martin

Geotools:
PROJCS["ETRS89 / ETRS-LAEA",
GEOGCS["ETRS89",
DATUM["European Terrestrial Reference System 1989",
SPHEROID["GRS 1980", 6378137.0, 298.257222101, AUTHORITY["EPSG","7019"]],
TOWGS84[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6258"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4258"]],
PROJECTION["Lambert Azimuthal Equal Area", AUTHORITY["EPSG","9820"]],
PARAMETER["latitude_of_center", 52.0],
PARAMETER["longitude_of_center", 10.0],
PARAMETER["false_easting", 4321000.0],
PARAMETER["false_northing", 3210000.0],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH],
AUTHORITY["EPSG","3035"]]


ESRI:

PROJCS["ETRS_1989_LAEA",
GEOGCS["GCS_ETRS_1989",
DATUM["D_ETRS_1989",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Lambert_Azimuthal_Equal_Area"],
PARAMETER["False_Easting",4321000.0],
PARAMETER["False_Northing",3210000.0],
PARAMETER["Central_Meridian",10.0],
PARAMETER["Latitude_Of_Origin",52.0],
UNIT["Meter",1.0]]



On 5/20/2010 3:36 PM, Andrea Aime wrote:
> Martin Tomko ha scritto:
>> Hi Andrea,
>> I just had the need to export some featurecollesction and check for 
>> the correctness of results in ArcGis with some other data, as a quick 
>> visualization workaround - I don't do visualization in GT...(I guess 
>> I should use uDig for this, eh?). Anyway, this has resulted in an 
>> error from the prj. so I googled it and asked.
>> It is not critical for me now, and I also think we should stick with 
>> the official database.
>>
>> Not sure what else could be done... I do not have the time and 
>> resources to figure a patch, but I guess that an optional parameter 
>> to newDataStore.forceSchemaCRS(crs, "authority"); could be done, 
>> where one could avoid it, defaulting to EPSG, or specify ESRI or 
>> Oracle or whatever... this would require an additional DB of 
>> definitions which would be a pain to maintain, I guess...
>
> What I think could be doable is a global hint setting the style of
> WKT to be generated. We have lists of aliases for projection and
> datum names for ESRI style that could be used to generate WKT in
> the specified flavor.
>
> Past that I don't really know what exactly the differences are.
> Do you have an example? I don't use ESRI software so I don't know how
> 3035 looks the ESRI way
>
> Cheers
> Andrea
>
>
>


-- 
Martin Tomko
Postdoctoral Research Assistant

Geographic Information Systems Division
Department of Geography
University of Zurich - Irchel
Winterthurerstr. 190
CH-8057 Zurich, Switzerland

email:  martin.to...@geo.uzh.ch
site:   http://www.geo.uzh.ch/~mtomko
mob:    +41-788 629 558
tel:    +41-44-6355256
fax:    +41-44-6356848


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