Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Kjell- Kjell Røang wrote:
As mentioned elsewhere, we want to use another projections package ( http://www.geotools.org/ ). We plan to use completly other kind out data that we need to transform. I can't find this MapProjectionDisplay in my display.
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.
It sounds pretty much how I will like to do it, but I might use Ricks mods to do the transformations. (JGrib should also support new projections as many will use JGrib without using Visad). In VisAd notation, the data would look something like: time -> ((lat, lon, z?) -> (pressure, v-wind, u-wind, ...))
It would be good to support new projections. As I say above,
if you are going to use GeoTools, then you could create a
GeoToolsCS that could be used in the VisAD objects (instead of
GRIBCoordinateSystem). It would extend visad.georef.MapProjection.
I would also suggest that you try to do lazy evaluation of t
the GRIB file using FileFlatFields instead of FlatFields. This
will be a little more work, but will only cause memory to be used
when a particular Field in requested. So the structure would be:
time -> (((lat, lon, z) -> pressure),
((lat, lon, z) -> v-wind),
((lat, lon, z) -> u-wind),
....)
The Vis5D and netCDF adapter (Plain) use this strategy.
Don
*************************************************************
Don Murray UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000
(303) 497-8628 Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
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