[webmap-discuss] Client side coordinate transformation library - Call to developers/testers

[Aaron Koning]

Hi Richard,

Its good to hear from you again. I am mostly interested in porting GCTP to
JavaScript. I have not had much use for datum conversions on the client
side, but I'd be interested to hear from anyone who has. Right now the
GCTP-JS port has the three most important projections for my region (Albers,
Lambert, UTM) and it works very well, so I am hesitant to get involved with
recreating this functionality. In addition, I believe that the GCTP can be
ported much quicker than Proj4 since it has less than half the files of
Proj4 and since many of the GCTP files contain only a few lines that need to
be converted. Perhaps there are more compelling reasons to redirect efforts?


Aaron

On 7/25/06, Richard Greenwood <richard.greenwood at gmail.com> wrote:
>
> On 7/24/06, Aaron Koning <aaronkoning at gmail.com> wrote:
> > Hello All,
> >
> > A while ago I created a client side coordinate transformation library
> called
> > GCTP-JS (Open Source, GPL licence). More accurately, I ported files
> directly
> > from the General Cartographic Transformation System (GCTP) C-code to
> > JavaScript.
> >      http://datashare.gis.unbc.ca/gctp-js/
> >
> > Simple example application:
> >      http://datashare.gis.unbc.ca/gctp-js/examples.php
> >
> > Implemented easily and successfully in the Flexible Internet Spatial
> > Template (FIST) web mapping application:
> >      http://fist-mapping.org
> >
> > Currently the 'port' is not complete (UTM, Albers, and Lambert
> projection
> > files have been ported). What I would like to see is a complete port of
> the
> > GCTP to JavaScript. Porting each projection file takes a few hours to a
> few
> > days depending on experience level (pretty quick I think). Then the
> > projection file must be tested, which is best done by someone who uses
> that
> > particular projection often.
> >
> > The best reasons to get involved are:
> >      - porting and testing can be done file by file;
> >      - porting a file doesn't take very long;
> >      - only work on the projections you want or the whole library;
> >       - very little planning is needed since it is a straightforward
> porting
> > exercise;
> >      - there is a definite and achievable end goal!
> >
> > Therefore, I would like all interested parties to contact me at the
> address
> > below and start porting and testing projection files as soon as
> possible. I
> > am eager to get going and help make this a success!
> >      aaronkoning at gmail.com
> >
> >  The GCTP C-code can be downloaded at:
> >
> > http://edcftp.cr.usgs.gov/pub//software/gctpc/gctpc_src.tar
> >
> > Thank you for your time,
> > Aaron
> >
> > +--------------------------------------------
> > |  Aaron Koning
> > |  Information Technologist
> > |  Prince George, BC, Canada.
> > +--------------------------------------------
> > |   http://datashare.gis.unbc.ca/fist/
> > |   http://datashare.gis.unbc.ca/gctp-js/
> > +--------------------------------------------
>
>
> Aaron,
>
> We must be on the same wavelength! Just yesterday I sent an eamil to a
> couple lists regarding the work that I have been doing toward porting
> the Proj.4 cs2cs program to Javascript.
>
> I went with Proj.4 over GCTP primarily because Proj.4 has support for
> datum transformations. Is the GCTP license Open Source?
>
> Would you be interested in combining our projects?
>
> Rich
>
> --
> Richard Greenwood
> richard.greenwood at gmail.com
> www.greenwoodmap.com
>



-- 
+--------------------------------------------
|  Aaron Koning
|  Information Technologist
|  Prince George, BC, Canada.
+--------------------------------------------
|  http://datashare.gis.unbc.ca/fist/
|  http://datashare.gis.unbc.ca/gctp-js/
+--------------------------------------------
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