Re: Resampling from lat/lon to projection


Don Murray wrote:

You could still use GeoTools on the VisAD adapter by creating
a GeoToolsCoordinateSystem that would take a GeoTools object
and use that to do the conversion.  I'll look at GeoTools when
I get a chance (maybe next week).  MapProjectionDisplay
is in the examples directory.  The examples do not have
packages, so you would have to cd to the examples directory
and run java MapProjectionDisplay.

I just took a quick look at the GeoTools source and it looks
like you could create a GeoToolsProjectionCoordinateSystem
that would extend visad.georef.MapProjection and take
a as
a constructor.  The toRef method (ref being lon, lat)
would call Projection.unproject() for each x,y and
the CS.fromRef() would call Projection.project().
You'd have to get the indices of lat/lon set right,
but MapProjection has hooks for this.  The defaultMapArea
could be defined from Projection.projectedExtent.

Again, I'd reiterate Tom's suggestion that you let VisAD do
as much of the hard work automagically instead of having to
manually do the transforms.

Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307

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