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

Richard Greenwood richard.greenwood at gmail.com
Tue Jul 25 15:33:04 EDT 2006

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/
> +--------------------------------------------


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?


Richard Greenwood
richard.greenwood at gmail.com

More information about the Proj mailing list