Delfos, Jacob wrote:
Hi Stefan,
Yes, you do have to specify which projection each layer is in, otherwise
when they are reprojected you will run into trouble (if it doesn't know
where to reproject FROM, it won't be able to do i). It's not too hard,
though.
You should not have to recalculate the extent; it should be automatic.
Definitely don't try to change the numbers (coordinates) without
changing the projection (that would be bad).
Try this:
$newproj="proj=robin,lon_0=0,x_0=0,y_0=0"; // projection string of your
new projection
$map->setProjection($newproj,MS_TRUE);
I think that ought to be all. The MS_TRUE makes it pick the best fit to
the current extent in the new projection. Make sure your projection
string is valid.
Jacob,
A good suggestion!
Just to pick a nit or two, I'd like to encourage people to use the "+"
syntax for projections as it avoids some quirky things with the above
approach. The plus notation would look like:
$newproj="+proj=robin +lon_0=0 +x_0=0 +y_0=0";
or as a PROJECTION block:
PROJECTION
"+proj=robin +lon_0=0 +x_0=0 +y_0=0"
END
Also, it is a good practice to include an explicit ellipse or datum
in coordinate system definitions.
$newproj="+proj=robin +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84";
Best regards,
--
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