php3-mapscript and projections

[Doyon, Jean-Francois]

Hey guys,

How do I setup projections using MapScript (PHP3) ?

I have a temporary shapefile that is in a different porjection than the rest
of my data ...

I haven't seen anything in the docs talking about a "projection object" or
anything like that ...

When I create a new layer from scratch in mapscript, how do I specify PROJ.4
parameters ?

Also, exactly where in the map file do I specify the projection for the
"output image" ?
So far I've done all the layers (except the temp one mentionned above), and
everything works 
fine, but then as it stands no conversion is being done. Do I put it at the
top, in no section in
particular ? Or in the "Web" section ?

Also, is it possible that specifying the projection for all your layers
(even if they all have the exact
same projection), makes things slightly faster ? Could be just an illusion
though :)

Thank you,

J.F.

> ----------
> From: 	Christian[SMTP:christian at gottschling.net]
> Sent: 	Wednesday, August 30, 2000 2:22 PM
> To: 	Assefa Yewondwossen
> Cc: 	mapserver-users at lists.gis.umn.edu
> Subject: 	php3-expression and zoom
> 
> Hi,
> this answer was damn fast! Many thanks, I try it tomorrow when I am back
> in 
> the office.
> This helps a lot!
> Has there anybody an example for the zooming-buttons, too? I haven't found
> 
> out from the gmap-example.
> 
> Can I even set a dynamic label  to the regions selected by "expression"?
> 
> 
> >  Here is an example that dynamically creates classes
> >on a certain layer (assumes here that $gpoMap is the
> >map object and there is a layer called classified in
> >the .map file) :
> >
> >$poLayer = $gpoMap->getlayerbyname("classified");
> >
> >$poLayer->set("classitem", "VW");
> >
> >$nColorId = $gpoMap->addColor(255, 0, 0);
> >
> >$poClass = ms_newClassObj($poLayer);
> >
> >$poClass->set("color", $nColorId);
> >
> >$poClass->setExpression("069");
> 
> What is the maximum number of classes and what is the practical maximum so
> 
> that the map is served in time?
> I like to run this within a loop and in the worst case I would have more 
> than 5000,  (all prefixes of germany).
> 
> 
> --
> Christian
> 
> --
> christian
>