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

[Josh Rosenthal]

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 <madair at dmsolutions.ca> wrote:

> 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 <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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>>
>>    --     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
>>
>>
>>
>>
> --
>  Michael Adair
>  Senior Software Architect
>  DM Solutions Group Inc.
>
>  Office: (613) 565-5056 x26
>  madair at dmsolutions.ca
>  http://www.dmsolutions.ca
>  http://research.dmsolutions.ca
>
>
>
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