On Wed, Mar 21, 2012 at 10:32 PM, Martin Davis <[email protected]> wrote:
> What are the responsibilities of Rendering Transformations when a CRS
> transformation is being applied in the rendering pipeline?
>
> As far as I have seen so far, the RT process is supplied with the data in
> the source CRS, and the result is expected to be in the target CRS. This
> implies that RTs are responsible for doing a CRS transformation if
> required. Is this correct?
>
>
Hmm... not example.
The rendering transformation can do both, either leave the output in the
data native CRS or go directly to
the output CRS (or even to a third one). If the data is not transformed the
renderer should do that later.
A rendering transformation to the renderer should just be a wrapper around
the data access mechanism.
Typically vector to vector or raster to vector transformations do not
reproject, raster ones can but it's
not a requirement.
Data access wise, normal vector and rasters do return data in their native
systems, but for example WMS
cascading does also the reprojection if at all possible (e.g., if the
remote server can output in the desired
SRS)
Cheers
Andrea
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