[OSGeo-Discuss] projection projects

[Landon Blake]

Thanks for the e-mail Luis.

You wrote: " in gvSIG we're using a quite diferent approach to
projections
support. We're using a JNI wrapper over proj4, due to the accuracy of
this library in the case of spanish datum changes (ED50-ETRS89)."

This sounds like a good approach for your project, but I wonder how good
of a fit it will be with other Java projects. I think at the end of the
day most Java projects will want a %100 Java library.

You wrote: "This is a sepparate project included on gvSIG, called
libJCRS, that
includes support for different SRS repositorys (EPSG, ESRI, IAU2000) as
well as end user datums and projections."

This sounds like something we could use. I wonder how different it is
from the GeoTools code that accesses the ESPG database. I'm not really
an active GeoTools developer, so it will be hard for me to answer this
question. It would be great if we could integrate GeoTools work with
this libJCRS library.

Can you send me a link to Javadoc or other infor on libJCRS. Maybe I
will bounce an e-mail over to the GeoTools folks.

Landon 


-----Original Message-----
From: discuss-bounces at lists.osgeo.org
[mailto:discuss-bounces at lists.osgeo.org] On Behalf Of Luis W. Sevilla
Sent: Monday, January 21, 2008 11:09 AM
To: OSGeo Discussions
Subject: Re: [OSGeo-Discuss] projection projects

Hi Landon,
    in gvSIG we're using a quite diferent approach to projections
support. We're using a JNI wrapper over proj4, due to the accuracy of
this library in the case of spanish datum changes (ED50-ETRS89).
Normative operations use a NadGrids grid, and geotools does not (or at
last did not) support it.
    Another reason was to unify projection support both with geoDatabase
(Postgis), and also with main WMS server (mapserver) on our SDI
configurations.
    This is a sepparate project included on gvSIG, called libJCRS, that
includes support for different SRS repositorys (EPSG, ESRI, IAU2000) as
well as end user datums and projections.
    We think this may be also a reusable library other java project may
also use.
    Greetings
       Luis
Landon Blake wrote:

>I've spoken with a couple of the GeoTools folks about helping to
>maintain their projection code, which uses the ESPG database. This is
of
>interest to me because it is a comprehensive (and working) projection
>library written in Java that we can incorporate into OpenJUMP.
>
>I don't know if there are any GeoTools/UDig developers that would like
>to participate in this OSGeo labs project that is under discussion, but
>I am interested. Perhaps I could help coordinate developments with
>GeoTools as part of what I hope will be my eventual support of
>projection code in GeoTools? I could definitely represent, at least
>unofficially, the OpenJUMP community.
>
>I'll subscribe to the mailing list that Frank set up.
>
>Landon
>
>-----Original Message-----
>From: discuss-bounces at lists.osgeo.org
>[mailto:discuss-bounces at lists.osgeo.org] On Behalf Of Frank Warmerdam
>Sent: Friday, January 18, 2008 9:49 AM
>To: OSGeo Discussions
>Cc: Robert Bray
>Subject: Re: [OSGeo-Discuss] projection projects
>
>Mike Adair wrote:
>  
>
>>I'd like to follow up on a conversation that took place at FOSS4G in 
>>Victoria regarding a gathering of the open source projection clan
>>    
>>
>under 
>  
>
>>the OSGeo umbrella.  Frank can probably expand on the idea more, but
>>    
>>
>the 
>  
>
>>idea being that it would be an opportunity to build up a community 
>>around the various coordinate system projects, each of which likely 
>>wouldn't be able to sustain that on their own.
>>
>>My immediate motivation for bringing this up now is that I need to set
>>    
>>
>
>  
>
>>up a project infrastructure for proj4js [1]  (svn, trac, email, PSC, 
>>etc.).  This might be a good fit as an OSGeo 'Lab' project as
>>    
>>
>discussed 
>  
>
>>a few months ago, either as a project on it's own or within a group of
>>    
>>
>
>  
>
>>projection projects.
>>    
>>
>
>Mike,
>
>Good timing!  I am still interested in this concept though I haven't
>followed
>up on it yet.  My hope was that we could treat a variety of coordinate
>system
>activities as one Project from an OSGeo point of view.  This helps get
>us
>past the issue that some (all?) of them are rather small in terms of
>teams
>to justify the full "OSGeo project treatment".
>
>But more importantly it would give us a forum to cooperate.  Sharing
>things like coordinate system dictionaries, test suites and such.
>
>My hopes for participants include:
>
>   proj4js
>   proj.4 (the version of PROJ.4 that I maintain)
>   libproj4 (the projection-only library maintained by Gerald Evenden)
>   OSGSpatialReference (GDAL coordinate system translation classes)
>   CS-Map (the recently open sourced library from Norm Olsen)
>
>I'm also hopeful that folks from GeoTools, and OSSIM who maintain their
>own projections code would participate to take advantage of the
>dictionaries and test suites even though their libraries wouldn't
>be part of the project.
>
>This is a somewhat unorthodox arrangement so I've hesitated a bit to
>initiate things.  Also, it obviously needs agreement from several
>parties. :-)
>
>In the interest of moving on a bit, I've created a wiki page:
>
>   http://wiki.osgeo.org/index.php/MetaCRS
>
>I've also created a mailing list.  Please join if you have an
>interest.
>
>   http://lists.osgeo.org/mailman/listinfo/MetaCRS
>
>Best regards,
>  
>

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