Hi,
You'll have to set the projection of all your layers in the mapfile.
This why changing the projection of the map object won't affect them.
Then you'll be able to use:
$map->setProjection("proj=robin,lon_0=0,x_0=0,y_0=0", MS_TRUE);
For the PostGIS SRID, you don't have to change anything if you set the
PROJECTION in your layer.
Julien
Brent Wood wrote:
--- Stefan Schwarzer <[EMAIL PROTECTED]> wrote:
Hi there,
i am struggling since quite a while to set-up a change-projection-on-
the-fly possibility for our website mapserver. But somehow, I don't
really have the clue how to do it. Now, making things "worse" (more
complicated for me) we have migrated from MySql to Postgres/Postgis.
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----
At least your spatial queries now have a chance of returning correct answers
:-)
The way I prefer to do this is to have the SQL thrown at Postgis do the
conversion, so mapserver doesn't have to. Thus:
select transform(the_geom, SRID)
instead of
select the_geom
But that's probably just because I have a SQL/database background, so tend to
do my work there. But it saves the wrestling with mapscript that you're going
through :-)
Cheers,
Brent Wood
So, first question would be: What code to use to change the
projection via PHP/Mapscript, should be something like this, I guess:
$newproj=ms_newprojectionObj("proj=robin,lon_0=0,x_0=0,y_0=0");
$latlon=ms_newprojectionObj("+proj=longlat +ellps=WGS84 +datum=WGS84
+no_defs");
$oldext=ms_newRectObj();
$oldext->setextent(-180,-90,180,90); //this is the extent of my map
in geographic
$oldext->project($latlon,$newproj); //reproject to Robinson
$map->setextent($oldext->minx,$oldext->miny,$oldext->maxx,$oldext-
>maxy); //set the new map extent
But I guess, something is still missing... (What about $map-
>setProjection ?)
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And the second question is: As my mapfile queries the postgis
database, using "SRID", I guess I need to change that one too, then?
Instead of 4326 for Geographic I would have to use the one for
Robinson (or Mollweide or so) ??
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----
Thanks for giving me any hints...
Stef
--
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/
