Hi Mike,<br><br>I'm going to check the PROJ.4 files to reproduce the geocent behavior you described.<br>I'll keep you in touch.<br><br>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... <br>
<br>Thanks for your help!<br>Sincerely,<br clear="all">Clément Ronzon<br>151 Av. Félix Faure<br>69003 LYON, FRANCE<br>Tel. # : +33 (0)9 54 43 12 20<br>Fax # : +33 (0)9 59 43 12 20<br>Cell. # : +33 (0)6 08 21 23 27<br><a href="http://twcc.free.fr" target="_blank">http://twcc.free.fr</a><br>
<a href="http://www.grottocenter.org" target="_blank">http://www.grottocenter.org</a><br><a href="http://www.zakbag.com" target="_blank">http://www.zakbag.com</a><br>
<br><br><div class="gmail_quote">On Thu, Sep 9, 2010 at 8:51 PM, Mike Adair <span dir="ltr"><<a href="mailto:madair@dmsolutions.ca">madair@dmsolutions.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
Hi Clement,<br>
<br>
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. <br>
<br>
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.<br>
<br>
Mike<div><div></div><div class="h5"><br>
<br>
<br>
<br>
On 9/8/2010 6:54 AM, Clément Ronzon wrote:
</div></div><blockquote type="cite"><div><div></div><div class="h5">Hi everyone!<br>
<br>
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 (<a href="http://twcc.free.fr" target="_blank">http://twcc.free.fr</a>).<br>
<br>
I have a question about geocent projections.<br>
I have the following definition :<br>
<i>Proj4js.defs["IGNF:AMST63"] = "+title=Ile d'Amsterdam 1963
+proj=<b>geocent</b> +towgs84=109.7530,-528.1330,-362.2440
+a=6378388.0000 +rf=297.0000000000000 +units=m +no_defs";</i><br>
<br>
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 (<a href="http://trac.osgeo.org/proj4js/ticket/16" target="_blank">http://trac.osgeo.org/proj4js/ticket/16</a>).<br>
<br>
So I tried to create /lib/projCode/geocent.js with this content:<br>
<i>Proj4js.Proj.geocent = {<br>
GEOCENT_LAT_ERROR:0x0001,<br>
init: function() {<br>
//no-op<br>
},<br>
forward: function(pt) {<br>
//identity transform<br>
return pt;<br>
},<br>
inverse: function(pt) {<br>
//identity transform<br>
return pt;<br>
}<br>
};</i><br>
<br>
But it seems that the result of transformations is wrong (some
meters on X and Y).<br>
Could someone tell me how can I solve this issue please ?<br>
<br>
Thanks in advance! And, by the way, congratulations for those
metaCRS projects!!!<br clear="all">
Clément Ronzon<br>
151 Av. Félix Faure<br>
69003 LYON, FRANCE<br>
Tel. # : +33 (0)9 54 43 12 20<br>
Fax # : +33 (0)9 59 43 12 20<br>
Cell. # : +33 (0)6 08 21 23 27<br>
<a href="http://twcc.free.fr" target="_blank">http://twcc.free.fr</a><br>
<a href="http://www.grottocenter.org" target="_blank">http://www.grottocenter.org</a><br>
<a href="http://www.zakbag.com" target="_blank">http://www.zakbag.com</a><br>
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<pre cols="72">--
Michael Adair
Senior Software Architect
DM Solutions Group Inc.
Office: (613) 565-5056 x26
<a href="mailto:madair@dmsolutions.ca" target="_blank">madair@dmsolutions.ca</a>
<a href="http://www.dmsolutions.ca" target="_blank">http://www.dmsolutions.ca</a>
<a href="http://research.dmsolutions.ca" target="_blank">http://research.dmsolutions.ca</a>
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