On Apr 14, 2005, at 9:12 PM, John Caron wrote:
Tennessee Leeuwenburg wrote:
Hi guys,
We're looking at phase two of the project I'm working on at the
moment. Phase one involved hooking up our weirdo database to OpenDAP,
and it looks that that will be a success. There's one thing that's
not as wonderful as we might hope, and a couple of cool extra things
we'd like to do.
In order to cope with observational data stored in BUFR format, we've
had to write scripts for conversion to NetCDF prior to serving it
with thredds. I don't really like messing about in thredds code if I
can help it, on account of it makes code maintainance that much
harder. So we convert to NetCDF on a product-by-product basis. But it
would be way cool if we could serve BUFR data more generally and
without the conversion step. So my question is : does anyone on this
list care much about BUFR data, and is anyone thinking much about how
it might fit into an OpenDAP context?
What kind of data is stored in BUFR?
We have an "I/O service provider" framework in netcdf-java version
2.2, where you can read non-native files as if they are netcdf files.
This sounds really cool! Does this work by subclassing some generic
access methods? This would make all sorts of one-off servers easy for
us to write.
James
We have done GRIB files in this way, among others. It would probably
be very cool to be able to do that for BUFR files. If you're
interested i can tell you more.
The other angle is from the GIS world rather than the data sharing
world. We'd love to publish some of our data sets in such a way that
GIS packages can read them. To the best of my knowledge, no GIS
package reads OpenDAP or even NetCDF. This means we've either got to
do a conversion step from NetCDF into something that the GIS packages
can read, and then serve it out using a different server - like a
shapefile server for instance. So we would have to choose specific
products to make available, provide shapefile derivatives from our
hi-res NetCDF data, and tell people to go look there. It's not the
worst plan I've ever heard, but has anyone here heard about any
efforts to integrate OpenDAP more tightly with GIS software?
The next version of the THREDDS server will have OpenDAP integrated
into it. It will also have an experimental WCS server for gridded
data. The idea is that anything that can be read in through
netcdf-java version 2.2 can be served through opendap. If theres
enough georeferencing, these can also be served through WCS. Again it
would be cool to extend this to a WFS server for features, although it
would be a lot of work.
We are also working with ESRI on their project to read in netcdf
gridded files, and another project with GDAL/Cadcorp experimenting
with netcdf over WCS. Still both in research stage.
--
James Gallagher jgallagher at opendap.org
OPeNDAP, Inc 406.783.8663
