[MetaCRS] [Proj4js] geocent proj issue.

[Clément Ronzon]

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> 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
>
>
> _______________________________________________
> MetaCRS mailing listMetaCRS at lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/metacrs
>
>
> --
>    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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