Got it. Couple more questions:
I'd like to implement the Behrmann and Gall Orthographic projections. They are
simple Cylindrical Equal Area projections with a predefined standard parallel.
Do I need to create a new class for each of these projections or is there some
simple way to create an alias?
Similarly, how should I handle direct aliases such as the "Lambert Cylindrical
Equal Area"? Do I need to create new classes for these as well?
http://www.remotesensing.org/geotiff/proj_list/cylindrical_equal_area.html
Thanks Again,Peter
From: Andrea Aime <andrea.a...@geo-solutions.it>
To: Peter Borissow <peter.boris...@yahoo.com>
Cc: Geotools-Devel list <geotools-devel@lists.sourceforge.net>
Sent: Saturday, March 28, 2015 9:07 AM
Subject: Re: [Geotools-devel] Cylindrical Equal Area Projection
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
AndreaIl 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 assumesthe 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 resultswith 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?
CheersAndrea --
==GeoServer Professional Services from the experts! Visithttp://goo.gl/NWWaa2
for more information.==
Ing. Andrea Aime
@geowolfTechnical Lead
GeoSolutions S.A.S.Via Poggio alle Viti 118755054 Massarosa (LU)Italyphone:
+39 0584 962313fax: +39 0584 1660272mob: +39 339 8844549
http://www.geo-solutions.ithttp://twitter.com/geosolutions_it
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