-------- Original-Nachricht --------
Betreff: Re: [jump-devel] Projection with Geotools2 CRS
Datum: Sat, 15 Sep 2007 18:22:55 -0700
Von: Jody Garnett <[EMAIL PROTECTED]>
Antwort an: JUMP Developers <[EMAIL PROTECTED]>
An: JUMP Developers <[EMAIL PROTECTED]>
Referenzen: <[EMAIL PROTECTED]>
Hi Edgar:
We have a different idea of simplicity ;-) I tend to use the utility
class to get the job done.
CoordinateReferenceSystem src = CRS.decode("EPSG:31467");
CoordinateReferenceSystem trg = CRS.decode("EPSG:4326");
MathTransform transform = CRS.findMathTransform( src, trg );
Geometry targetGeometry = JTS.transform( sourceGeometry, transform);
This example and others are in the user guide:
- http://docs.codehaus.org/display/GEOTDOC/01+CRS+Helper+Class
Cheers,
Jody
> Hello All,
>
> because of all the comments related to projection (interfaces) , here
> is an example of the simplicity in using GT2 CRS for
> projection/transformation
>
> SNIPPET-->
> CoordinateOperationFactory coFactory =
> FactoryFinder.getCoordinateOperationFactory(null);
> MathTransform transform;
> src =
> FactoryFinder.getCRSFactory(null).createFromWKT("PROJCS[\"DHDN /
> Gauss-Kruger Zone 3\", GEOGCS[\"DHDN\", DATUM[\"Deutsches
> Hauptdreiecksnetz\", SPHEROID[\"Bessel 1841\", 6377397.155,
> 299.1528128, AUTHORITY[\"EPSG\",\"7004\"]], TOWGS84[598.1, 73.7,
> 418.2, 0.2019999999999998, 0.04499999999999995, -2.4549999999999974,
> 6.7], AUTHORITY[\"EPSG\",\"6314\"]], PRIMEM[\"Greenwich\", 0.0,
> AUTHORITY[\"EPSG\",\"8901\"]], UNIT[\"degree of
> angle\",0.017453292519943295], AXIS[\"Geodetic longitude\",EAST],
> AXIS[\"Geodetic latitude\",NORTH], AUTHORITY[\"EPSG\",\"4314\"]],
> PROJECTION[\"Transverse_Mercator\"], PARAMETER[\"semi_major\",
> 6377397.155], PARAMETER[\"semi_minor\", 6356078.962818189],
> PARAMETER[\"central_meridian\", 8.999999999999991],
> PARAMETER[\"latitude_of_origin\", 0.0], PARAMETER[\"scale_factor\",
> 1.0], PARAMETER[\"false_easting\", 3500000.0],
> PARAMETER[\"false_northing\", 0.0], UNIT[\"metre\",1.0],
> AXIS[\"Easting\",EAST], AXIS[\"Northing\",NORTH],
> AUTHORITY[\"EPSG\",\"31467\"]]");
> //src = FactoryFinder.getCRSAuthorityFactory("EPSG",
> null).createCoordinateReferenceSystem("EPSG:31467");
> trg = FactoryFinder.getCRSAuthorityFactory("EPSG",
> null).createCoordinateReferenceSystem("EPSG:4326");
> CoordinateOperation co = coFactory.createOperation(src, trg);
> transform = co.getMathTransform();
> <--SNIPPET
>
> the snippet is only rough cut out of my tests. It will not compile in
> this state, but still it shows how easy it is with GT2 to get a
> transformation (from WKT or EPSG ID, as you choose) for projecting
> coordinates. The EPSG entries of the factory are of course
> request-/listable by name(description).
>
> just trying to lobby for the GT2 library, as I get the impression the
> list is a bit afraid of it ;).
>
> regards ede
>
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