Re: [udig-devel] Re: Polyconic Projection

[Rahul... हम पंछी उन्मुक्त गगन के <rahul.official@xxxxxxxxx>]

Thanks Jody,
I have a link of geotools help doc 
http://docs.codehaus.org/display/GEOTDOC/How+to+add+new+projections 
.

Here it is mentioned how a new projection can be added by taking help 
of 
proj4. It seems geotools also implements the proj4 projection 
equations.

2009/6/1 Jody Garnett <jody.garnett@xxxxxxxxx>

Hi Rhaul:

I asked the module maintainer of referencing to help point you in a
good direction. I had to do some referencing work a while back and
took some notes here:
- http://docs.codehaus.org/display/GEOTDOC/Referencing+Developers+Guide

There is a helper class called CRS that can help you build things; but
it mostly delegates to all the factories and authorities and so on
talked about in the link above. Chances are there is going to be a
factory that needs to recognize the words "Polyconic" and produce an
implementation of a projection class of some sort.

Jody


2009/6/1 Rahul... हम पंछी उन्मुक्त गगन के <rahul.official@xxxxxxxxx>:

> Hi Jody/Mauricio,
> Can you tell me what are the files in GEOTOOLS that need to be changed if I
> want to add a new projection. I am going thru the geotools code for four
> days now but  still not able to find a way. I am not able to understand the
> proper workflow for creating a CRS object from a wkt String
> crsFactory.createFromWKT(String wktString) method;.
>
> 2009/5/28 Mauricio Pazos <mauricio.pazos@xxxxxxxx>
>>
>> On Wednesday 27 May 2009 16:33:53 Jody Garnett wrote:
>> > > Hi Jody,
>> > > I think proj4 library already supports polyconic projections. Can't we
>> > > use it directly in geotools?
>> >
>> > Not directly; geotools has a pure java solution going on for
>> > referencing.
>> A Java Native Interface (jni) could be developed as a java wrapper over
>> the
>> proj api. This solution provides access to java but it requires to compile
>> proj for each platform. (Perhaps this good library justifies this effort).
>>
>> cheers
>> --
>> Mauricio Pazos
>> www.axios.es
>
>
>
> --
> Thanks,
> Rahul
>

-- 
Thanks,
Rahul