[MetaCRS] Proj4js: Converting from EPSG:4326 -> EPSG:28193 fails

[Josh Rosenthal]

Unfortunately, having the conversion be accessible in a lightweight
webapp/hta was part of the basic idea (to say nothing about javascript being
the primary development I'm comfortable with), and as such I think I'm
stuck.  How much of proj.4 is missing from proj4js?  Did I just pick the odd
one out, or is it a fair variety of proj.4? (ie: how likely am I to run into
this for other projects?)

Josh

On Tue, Mar 24, 2009 at 3:10 PM, Christopher Schmidt <
crschmidt at metacarta.com> wrote:

> On Tue, Mar 24, 2009 at 12:02:27PM -0700, Hugues Wisniewski wrote:
> > Hi,
> >
> > I don't know if you'd be interested in this but CsMap supports this
> Cassini projection and the system 28193
> > You can access the CsMap API or if you have access to the MapGuide
> MgCoordinateSystem API that is a wrapper around CsMap you can do it too
>
> Proj.4 does as well; but neither proj.4 nor CsMap are accessible in
> Javascript.
>
> -- Chris
>
> > Hugues
> >
> > From: metacrs-bounces at lists.osgeo.org [mailto:
> metacrs-bounces at lists.osgeo.org] On Behalf Of Josh Rosenthal
> > Sent: Tuesday, March 24, 2009 9:45 AM
> > To: Mike Adair
> > Cc: metacrs at lists.osgeo.org
> > Subject: Re: [MetaCRS] Proj4js: Converting from EPSG:4326 -> EPSG:28193
> fails
> >
> > Hi Mike,
> >
> > Thanks a lot.  I couldn't figure out if I was doing something wrong or...
>  In any case, you said 'yet'.  Is there a timeline as to when we could
> expect cassini projections to be supported, or do you have any other
> suggestions as to how to convert coordinates to/from that?  Curiously, it
> appears as though spatialreference.org<http://spatialreference.org> does
> support those reprojections, though I'm not sure what the back end is over
> there.
> >
> > In any case, any advice would be welcome,
> >
> > Thanks,
> >
> > Josh
> > 2009/3/24 Mike Adair <madair at dmsolutions.ca<mailto:madair at dmsolutions.ca
> >>
> > Josh,
> >
> > The cassini projection code ("proj=cass") hasn't been implemented in
> Proj4js yet.
> >
> > Mike
> >
> >
> > Josh Rosenthal wrote:
> > Hi Folks,
> >
> > I hope I'm sending this to the right list.  Apologies if not.
> >
> > I'm hitting a bit of a problem with a proj4js conversion, and I'm hoping
> someone can help.  I'm trying to go from EPSG 4326 to 28193, and I'm just
> getting my original coordinates returned.  As per
> http://spatialreference.org/ref/epsg/28193/ , I have the proj4js
> definition for 28193 as:
> > Proj4js.defs["EPSG:28193"] = "+proj=cass +lat_0=31.73409694444445
> +lon_0=35.21208055555556 +x_0=170251.555 +y_0=1126867.909 +a=6378300.789
> +b=6356566.435 +towgs84=-275.722,94.7824,340.894,-8.001,-4.42,-11.821,1
> +units=m +no_defs";
> >
> > To demonstrate, I've modified the converter in the proj4js homepage to
> also have 28193 (Old Israel Grid/Palestine 1923) and 2039 (New Israel Grid).
>  You can see the demo here: http://arkeotech.googlepages.com/Proj4js.htm
> > Converting the coordinates 35,31 from 4326 to 2039 works fine, but from
> 4326 to 28193 just returns 35,31.  Looking at the spatial reference page for
> 28193, you can use the viewer to get an approximation for those
> coordinates... it should be somewhere roughly around 149353, 1046172
> >
> > Any thoughts?
> >
> > Thanks,
> >
> > Josh
> >
> >
> > ------------------------------------------------------------------------
> >
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> > MetaCRS at lists.osgeo.org<mailto:MetaCRS at lists.osgeo.org>
> > http://lists.osgeo.org/mailman/listinfo/metacrs
> >
> >
> > --
> >  Michael Adair
> >  Senior Software Architect
> >  DM Solutions Group Inc.
> >
> >  Office: (613) 565-5056 x26
> >  madair at dmsolutions.ca<mailto:madair at dmsolutions.ca>
> >  http://www.dmsolutions.ca
> >  http://research.dmsolutions.ca
> >
> >
>
> > _______________________________________________
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>
>
> --
> Christopher Schmidt
> MetaCarta
>
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