[MetaCRS] [Proj4js] geocent proj issue.

[Mike Adair]

  Hi Clement,

There aren't any plans to support grid shift files currently.  The main 
issue is downloading some potentially large files to the client.

Mike


On 9/10/2010 3:29 AM, Clément Ronzon wrote:
> Hi Mike,
>
> I'm going to check the PROJ.4 files to reproduce the geocent behavior 
> you described.
> I'll keep you in touch.
>
> I've another question about "nadgrids" this time: do you know if 
> Proj4js could be able to handle nadgrids files ? May be using Ajax 
> requests...
>
> Thanks for your help!
> Sincerely,
> Clément Ronzon
> 151 Av. Félix Faure
> 69003 LYON, FRANCE
> Tel. # : +33 (0)9 54 43 12 20
> Fax # : +33 (0)9 59 43 12 20
> Cell. # : +33 (0)6 08 21 23 27
> http://twcc.free.fr
> http://www.grottocenter.org
> http://www.zakbag.com
>
>
> On Thu, Sep 9, 2010 at 8:51 PM, Mike Adair <madair at dmsolutions.ca 
> <mailto:madair at dmsolutions.ca>> wrote:
>
>     Hi Clement,
>
>     The contents of the old geocent.js file is now contained in the
>     main proj4js.js file and it mainly handled conversions to/from
>     geocentric/geodetic coordinates.
>
>     I assume you are trying to convert from geocentric to Lat/long
>     coords?  I see that PROJ.4 handles that case where the geocent
>     'projection' is defined with the identity transform (like you have
>     done) but i don't think that will work in Proj4js.  You may be
>     able to step through a transformation and see where the geocentric
>     - geodetic transform occurs and where any errors may be introduced.
>
>     Mike
>
>
>
>
>     On 9/8/2010 6:54 AM, Clément Ronzon wrote:
>>     Hi everyone!
>>
>>     I'm new on this mailing list, so I'll introduce myself in a few
>>     words: my name is Clément Ronzon, I'm living in France but I'm
>>     going to move to Mexico in a few months, I'm working in
>>     Informatics design and development for France Telecom, and I'm
>>     the developer of TWCC (http://twcc.free.fr).
>>
>>     I have a question about geocent projections.
>>     I have the following definition :
>>     /Proj4js.defs["IGNF:AMST63"] = "+title=Ile d'Amsterdam 1963
>>     +proj=*geocent* +towgs84=109.7530,-528.1330,-362.2440
>>     +a=6378388.0000 +rf=297.0000000000000 +units=m +no_defs";/
>>
>>     But when proj4js tries to load the geocent proj file it fails
>>     because there is no geocent.js file. Actually I found that this
>>     file has been removed (http://trac.osgeo.org/proj4js/ticket/16).
>>
>>     So I tried to create /lib/projCode/geocent.js with this content:
>>     /Proj4js.Proj.geocent = {
>>         GEOCENT_LAT_ERROR:0x0001,
>>       init: function() {
>>         //no-op
>>       },
>>       forward: function(pt) {
>>         //identity transform
>>         return pt;
>>       },
>>       inverse: function(pt) {
>>         //identity transform
>>         return pt;
>>       }
>>     };/
>>
>>     But it seems that the result of transformations is wrong (some
>>     meters on X and Y).
>>     Could someone tell me how can I solve this issue please ?
>>
>>     Thanks in advance! And, by the way, congratulations for those
>>     metaCRS projects!!!
>>     Clément Ronzon
>>     151 Av. Félix Faure
>>     69003 LYON, FRANCE
>>     Tel. # : +33 (0)9 54 43 12 20
>>     Fax # : +33 (0)9 59 43 12 20
>>     Cell. # : +33 (0)6 08 21 23 27
>>     http://twcc.free.fr
>>     http://www.grottocenter.org
>>     http://www.zakbag.com
>>
>>
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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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>
>
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-- 
    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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