Hi Jody,
I found some interesting examples from GeoTools 2.1, 2.2, 2.6 and 2.7
and they are quite different.
I am using Geotools 2.7 and the code I came up with is this:
//Vividsolutions classes
GeometryFactory geoFact = new GeometryFactory();
Coordinate coordinate = new Coordinate(577147.49750272d,
1252040.3464034d);
Point point = geoFact.createPoint(coordinate);
//GeoTools classes
CoordinateReferenceSystem epsg26913CRS = CRS.decode("EPSG:26913");
CoordinateReferenceSystem epsg4326CRS = CRS.decode("EPSG:4326", true);
boolean lenient = true; // allow for some error due to different datums
MathTransform transform = CRS.findMathTransform(epsg26913CRS,
epsg4326CRS, lenient);
Point newPoint = (Point) JTS.transform(point, transform);
The problem is that I am getting this exception on the CRS.decode
method:
org.opengis.referencing.NoSuchAuthorityCodeException: Authority "EPSG"
is unknown or doesn't match the supplied hints. Maybe it is defined in
an unreachable JAR file?
It compiles and run ok but it looks like I might be missing some
dependencies.
I have the following libraries in my app:
gt-api-2.7-SNAPSHOT.jar
gt-main-2.7-SNAPSHOT.jar
gt-metadata-2.7-SNAPSHOT.jar
gt-referencing-2.7-SNAPSHOT.jar
gt-shapefile-2.7-SNAPSHOT.jar
gt-swing-2.7-SNAPSHOT.jar
I need to use as few libraries as possible... So cannot download all
the Maven Geotools repository.
Do you know what gt jar am I missing?
Thanks
-----Original Message-----
From: Jody Garnett [mailto:[email protected]]
Sent: January 29, 2011 7:01 PM
To: Lopes, Jose (AAFC-AAC)
Cc: [email protected]
Subject: Re: [Geotools-gt2-users] Transforming CRS projections in
GeoJSON
There is code to parse GeoJSON; not sure how much it is used however.
To get up to speed with coordinate reference systems and so on check out
the tutorials:
- http://docs.geotools.org/latest/tutorials/
(Most of the time there are two helper classes that do the work for you
"JTS" and "CRS").
Jody
On 29/01/2011, at 7:22 AM, Lopes, Jose (AAFC-AAC) wrote:
Hi,
I have a set of supported CRS projections (EPSG) and I want to
transform them to longitude-latitude (EPSG:4326), the information is
presented in a GeoJson file.
In JS with OpenLayers I could do this in one line
(OpenLayers.Projection.transform(point, projFrom, projTo).
Is there a simple way to do this in Java with GeoTools? (I have not
worked with GeoTools referencing libraries yet...)
Thanks for any help-tips...
Jose
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