Proj4js: Converting from EPSG:4326 -> EPSG:28193 fails
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Josh Rosenthal
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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 _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Mike Adair
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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 > > > > ------------------------------------------------------------------------ > > _______________________________________________ > MetaCRS mailing list > [hidden email] > http://lists.osgeo.org/mailman/listinfo/metacrs > -- Michael Adair Senior Software Architect DM Solutions Group Inc. Office: (613) 565-5056 x26 [hidden email] http://www.dmsolutions.ca http://research.dmsolutions.ca _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Josh Rosenthal
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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 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 <[hidden email]> Josh, _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Christopher Schmidt-2
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On Tue, Mar 24, 2009 at 12:44:57PM -0400, Josh Rosenthal wrote:
> 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 does support those reprojections, > though I'm not sure what the back end is over there. proj.4 itself, which is what proj4js is based on originally (but the porting to js is incomplete). -- Chris > In any case, any advice would be welcome, > > Thanks, > > Josh > > 2009/3/24 Mike Adair <[hidden email]> > > > 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 > >> > >> > >> > >> ------------------------------------------------------------------------ > >> > >> _______________________________________________ > >> MetaCRS mailing list > >> [hidden email] > >> http://lists.osgeo.org/mailman/listinfo/metacrs > >> > >> > > > > -- > > Michael Adair > > Senior Software Architect > > DM Solutions Group Inc. > > > > Office: (613) 565-5056 x26 > > [hidden email] > > http://www.dmsolutions.ca > > http://research.dmsolutions.ca > > > > > > > _______________________________________________ > MetaCRS mailing list > [hidden email] > http://lists.osgeo.org/mailman/listinfo/metacrs -- Christopher Schmidt MetaCarta _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Mike Adair
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In reply to this post
by Josh Rosenthal
Josh,
No I don't have a schedule for converting the rest of the projection code over to Javascript. It is a matter of converting C code to Javascript and looking at the cassini code it shouldn't be too difficult to do. As Chris mentioned, on spatialreference.org the conversion is done server-side with Proj4. Mike Josh Rosenthal wrote: > 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 <[hidden email] > <mailto:[hidden email]>> > > 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 > > > > ------------------------------------------------------------------------ > > _______________________________________________ > MetaCRS mailing list > [hidden email] <mailto:[hidden email]> > http://lists.osgeo.org/mailman/listinfo/metacrs > > > > -- > Michael Adair > Senior Software Architect > DM Solutions Group Inc. > > Office: (613) 565-5056 x26 > [hidden email] <mailto:[hidden email]> > http://www.dmsolutions.ca > http://research.dmsolutions.ca > > > -- Michael Adair Senior Software Architect DM Solutions Group Inc. Office: (613) 565-5056 x26 [hidden email] http://www.dmsolutions.ca http://research.dmsolutions.ca _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Josh Rosenthal
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Thanks Mike, Chris,
Sounds like I'm stuck giving up on the project for the time being. I'd offer to take a stab at it, but my knowledge of C is basically non existent; I wouldn't even know where to start. In any case, my thanks for the quick answers. It's nice to know I wasn't going insane. Josh On Tue, Mar 24, 2009 at 1:17 PM, Mike Adair <[hidden email]> wrote: Josh, _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Hugues Wisniewski
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In reply to this post
by Josh Rosenthal
Some javascript/style in this post has been disabled (why?)
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 Hugues From:
[hidden email] [mailto:[hidden email]] On
Behalf Of Josh Rosenthal 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
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 <[hidden email]> Josh, Hi Folks, ------------------------------------------------------------------------
_______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Christopher Schmidt-2
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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: [hidden email] [mailto:[hidden email]] On Behalf Of Josh Rosenthal > Sent: Tuesday, March 24, 2009 9:45 AM > To: Mike Adair > Cc: [hidden email] > 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 <[hidden email]<mailto:[hidden email]>> > 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 > > > ------------------------------------------------------------------------ > > _______________________________________________ > MetaCRS mailing list > [hidden email]<mailto:[hidden email]> > http://lists.osgeo.org/mailman/listinfo/metacrs > > > -- > Michael Adair > Senior Software Architect > DM Solutions Group Inc. > > Office: (613) 565-5056 x26 > [hidden email]<mailto:[hidden email]> > http://www.dmsolutions.ca > http://research.dmsolutions.ca > > > _______________________________________________ > MetaCRS mailing list > [hidden email] > http://lists.osgeo.org/mailman/listinfo/metacrs -- Christopher Schmidt MetaCarta _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Josh Rosenthal
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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 <[hidden email]> wrote:
_______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Mike Adair
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The projection class code supported by Proj4js is listed here:
http://trac.osgeo.org/proj4js/wiki/UserGuide#Supportedprojectionclasses The ones that are listed as 'validated' have been tested against some test points and I feel pretty confident that they are working correctly. This list should cover the most common projections I've encountered. The ones listed as 'not validated' (these seem to be mostly in the PROJ4/nad/esri file) have projection code available but they don't match up against test points. I would like to get these fixed and validated before we do a 1.0 final release of Proj4js. Then there are other projections supported by PROJ4 that aren't on either list, such as cass, that I've never had need for, so never implemented. If there is a need I could do the work but that requires me finding some free time to do that, others are welcome to contribute that way as well. Mike Josh Rosenthal wrote: > 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 > <[hidden email] <mailto:[hidden email]>> 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: [hidden email] > <mailto:[hidden email]> > [mailto:[hidden email] > <mailto:[hidden email]>] On Behalf Of Josh Rosenthal > > Sent: Tuesday, March 24, 2009 9:45 AM > > To: Mike Adair > > Cc: [hidden email] <mailto:[hidden email]> > > 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><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 <[hidden email] > <mailto:[hidden email]><mailto:[hidden email] > <mailto:[hidden email]>>> > > 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 > > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > MetaCRS mailing list > > [hidden email] > <mailto:[hidden email]><mailto:[hidden email] > <mailto:[hidden email]>> > > http://lists.osgeo.org/mailman/listinfo/metacrs > > > > > > -- > > Michael Adair > > Senior Software Architect > > DM Solutions Group Inc. > > > > Office: (613) 565-5056 x26 > > [hidden email] > <mailto:[hidden email]><mailto:[hidden email] > <mailto:[hidden email]>> > > http://www.dmsolutions.ca > > http://research.dmsolutions.ca > > > > > > > _______________________________________________ > > MetaCRS mailing list > > [hidden email] <mailto:[hidden email]> > > http://lists.osgeo.org/mailman/listinfo/metacrs > > > -- > Christopher Schmidt > MetaCarta > > -- Michael Adair Senior Software Architect DM Solutions Group Inc. Office: (613) 565-5056 x26 [hidden email] http://www.dmsolutions.ca http://research.dmsolutions.ca _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Hugues Wisniewski
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In reply to this post
by Christopher Schmidt-2
One solution would be the MapGuide API I think. SWIG is used on the C++ API to generate java APIs
-----Original Message----- From: Christopher Schmidt [mailto:[hidden email]] Sent: Tuesday, March 24, 2009 12:11 PM To: Hugues Wisniewski Cc: Josh Rosenthal; Mike Adair; [hidden email] Subject: Re: [MetaCRS] Proj4js: Converting from EPSG:4326 -> EPSG:28193 fails 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: [hidden email] [mailto:[hidden email]] On Behalf Of Josh Rosenthal > Sent: Tuesday, March 24, 2009 9:45 AM > To: Mike Adair > Cc: [hidden email] > 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 <[hidden email]<mailto:[hidden email]>> > 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 > > > ------------------------------------------------------------------------ > > _______________________________________________ > MetaCRS mailing list > [hidden email]<mailto:[hidden email]> > http://lists.osgeo.org/mailman/listinfo/metacrs > > > -- > Michael Adair > Senior Software Architect > DM Solutions Group Inc. > > Office: (613) 565-5056 x26 > [hidden email]<mailto:[hidden email]> > http://www.dmsolutions.ca > http://research.dmsolutions.ca > > > _______________________________________________ > MetaCRS mailing list > [hidden email] > http://lists.osgeo.org/mailman/listinfo/metacrs -- Christopher Schmidt MetaCarta _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Christopher Schmidt-2
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On Tue, Mar 24, 2009 at 01:22:15PM -0700, Hugues Wisniewski wrote:
> One solution would be the MapGuide API I think. SWIG is used on the C++ API to generate java APIs Java is not Javascript; Javascript runs in a browser environment, rather than on the server, which is what the OP is looking for. No library other than proj4js (or its predecessors in Javascript land) does this at this time. -- Chris > -----Original Message----- > From: Christopher Schmidt [mailto:[hidden email]] > Sent: Tuesday, March 24, 2009 12:11 PM > To: Hugues Wisniewski > Cc: Josh Rosenthal; Mike Adair; [hidden email] > Subject: Re: [MetaCRS] Proj4js: Converting from EPSG:4326 -> EPSG:28193 fails > > 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: [hidden email] [mailto:[hidden email]] On Behalf Of Josh Rosenthal > > Sent: Tuesday, March 24, 2009 9:45 AM > > To: Mike Adair > > Cc: [hidden email] > > 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 <[hidden email]<mailto:[hidden email]>> > > 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 > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > MetaCRS mailing list > > [hidden email]<mailto:[hidden email]> > > http://lists.osgeo.org/mailman/listinfo/metacrs > > > > > > -- > > Michael Adair > > Senior Software Architect > > DM Solutions Group Inc. > > > > Office: (613) 565-5056 x26 > > [hidden email]<mailto:[hidden email]> > > http://www.dmsolutions.ca > > http://research.dmsolutions.ca > > > > > > > _______________________________________________ > > MetaCRS mailing list > > [hidden email] > > http://lists.osgeo.org/mailman/listinfo/metacrs > > > -- > Christopher Schmidt > MetaCarta -- Christopher Schmidt MetaCarta _______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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Josh Rosenthal
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Chris is right. I'm trying to stick to the browser environment for this. Since I've basically requested that if anyone has the know-how and the free time, and the gratuitous goodwill, they convert cass for proj4js, I'll sketch out the use case as well (ie: why its more than just one wacky unknown on a listserv).
I'm working on this in response to a query from a friend of mine in Israel. In Israel, many of the current maps list both New Israeli Grid (EPSG:2039) and Old Israeli Grid (EPSG:28139, transformed with y - 1,000,000), but most of the older records (before the mid 90s) only have OIG. There are also many coordinates in lat/lon (4326) courtesy of the everpresent consumer GPS units. I'd basically been planning to build a little webapp which would take multiple lines of comma delimited coordinates in one projection, and convert them to another, with output available in html, csv, and as an excel spreadsheet. Easy to build, with an eye towards being easy and straightforward to use. Unfortunately, my programming skills get shakier outside of a javascript environment, and in any case, it wouldn't work as a publically accessible webapp.
Chris, you mentioned proj4js's js predecessors. Do any of them handle the cass projections? I'm only familiar with proj4js. Thanks, Josh
On Tue, Mar 24, 2009 at 4:26 PM, Christopher Schmidt <[hidden email]> wrote:
_______________________________________________ MetaCRS mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/metacrs |
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