That is fine, the area of definition is available only when you pick a CRS
from the EPSG database... and it's the legal one, not related to the
capabilities of the projection math (in other terms, not that useful)
Cheers
Andrea
Il 28/mar/2015 13:48 "Peter Borissow" <peter.boris...@yahoo.com> ha scritto:
> This is great!
>
> I updated the org.geotools.referencing.operation.MathTransformProvider
> file in the "gt-referencing" jar file and now GeoTools is now able to "see"
> my projection.
>
> However, I still think I'm missing something. I think I need to
> create/update the CRSFactory or something to set the DomainOfValidity.
> Here's the code:
>
>
> String behrmannWKT =
> "PROJCS[\"World_Behrmann\"," +
> "GEOGCS[\"GCS_WGS_1984\"," +
> "DATUM[\"WGS_1984\"," +
> "SPHEROID[\"WGS_1984\",6378137,298.257223563]]," +
> "PRIMEM[\"Greenwich\",0]," +
> "UNIT[\"Degree\",0.017453292519943295]]," +
> "PROJECTION[\"Cylindrical_Equal_Area\"]," +
> "PARAMETER[\"False_Easting\",0]," +
> "PARAMETER[\"False_Northing\",0]," +
> "PARAMETER[\"Central_Meridian\",0]," +
> "PARAMETER[\"Standard_Parallel_1\",30]," +
> "UNIT[\"Meter\",1]," +
> "AUTHORITY[\"EPSG\",\"54017\"]]";
>
>
> CoordinateReferenceSystem crs = CRS.parseWKT(behrmannWKT);Extent
> crsExtent = crs.getDomainOfValidity(); //<-- RETURNS NULL???
>
>
> Thanks,
> Peter
>
>
> ------------------------------
> *From:* Andrea Aime <andrea.a...@geo-solutions.it>
> *To:* Peter Borissow <peter.boris...@yahoo.com>
> *Cc:* "geotools-devel@lists.sourceforge.net" <
> geotools-devel@lists.sourceforge.net>
> *Sent:* Saturday, March 28, 2015 7:03 AM
> *Subject:* Re: [Geotools-devel] Cylindrical Equal Area Projection
>
> On Fri, Mar 27, 2015 at 10:48 AM, Peter Borissow <peter.boris...@yahoo.com
> > wrote:
>
> Hello-
> I would like to contribute to GeoTools by implementing the Cylindrical
> Equal Area Projection:
>
> http://www.remotesensing.org/geotiff/proj_list/cylindrical_equal_area.html
>
> In doing so, we should be able to support other cylindrical equal area
> projections like NSIDC EASE-Grid Global (EPSG:3410), Behrmann (EPSG:54017),
> Peters, Gal, etc.
>
> I am a geotools novice but would like to contribute. What is the process
> for adding a new projection?
>
> I believe the first step is to implement a class that extends
> MapProjection. This code looks like a good place to start:
>
>
> http://trac.osgeo.org/proj4j/browser/trunk/src/main/java/org/osgeo/proj4j/proj/CylindricalEqualAreaProjection.java
>
>
> Hi Peter,
> normally what we do is to port the math from libproj, not sure if proj4j
> is any different, the geotools code assumes
> the projection works on the unit sphere:
> http://trac.osgeo.org/proj/browser/trunk/proj/src/PJ_cea.c
>
> What else needs to be done?
>
>
> You basically have to wrap it in the GeoTools own plugin structure
> (projection, provider),
> declare the provider in META-INF/services, and add a test comparing your
> results
> with some that cs2cs generated.
>
> Here is a couple of commits adding a new projection, for reference.
> Sinusoidal:
>
> https://github.com/geotools/geotools/commit/ec4b692a7fc24b51925f5721b5361bedc093bb0a
> EckertIV, WinkelTripel, Mollweide, Aitoff, WagnerIV (all in one shot):
>
> https://github.com/geotools/geotools/commit/07c3ed790af1a9395b60903ab90ad09d5f8479c0
>
>
>
>
>
>
> PS. I posted a question on the gt mailing list with no response:
> http://sourceforge.net/p/geotools/mailman/message/33626933/
>
>
> I never received those messages, wondering if others here did?
>
> Cheers
> Andrea
>
> --
> ==
> GeoServer Professional Services from the experts! Visit
> http://goo.gl/NWWaa2 for more information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
> fax: +39 0584 1660272
> mob: +39 339 8844549
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
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