Tennessee James Leeuwenburg wrote:
Hi,
I have just been looking at the state of the various DODS servers. My
DODS work has been on hiatus while to cut a long story short "some
other stuff was happening". I'm back on the wagon now.
Can you answer a simple question for me - Can the Agg server read
netCDF files from a remote URL and serve them up?
I have a cgi script which will take my crazy MARS requests in a URL,
and give back a netCDF file. What would be easiest for me would be to
build a catalog of these using the Aggregation server. I had been
working on modifying the back end of a DODS server, but it would be a
very simple solution if I could just point the Agg server at a URL.
When I actually try this, I get some NullPointerExceptions in the log
file, and the data set does not appear. It could be a bad
configuration on my part, but I am not so sure. It works fine for the
remote data sets in the sample configuration file, but obviously they
are dods URLS rather than actual netCDF files.
I also have has some troubles with some local files that I have, again
I'm getting runtime exceptions without any real explanation of what's
going on.
I went looking for THREDDS source code. I think I have a copy of some
anyway from about 8 months ago when I was tinkering with modifying
DODS to be able to query my unusual database backend directly, but I
would prefer to work off current code.
Cheers,
-T
Hi Tennessee:
The Agg server can aggregate local netcdf files or remote DODS datasets.
So if you have a netcdf files served through a dods server, the AS can
aggregate them. Using local netcdf files are preferable when possible
because its a lot faster
Make sure you have the latest war file, which now comes as part of the
thredds server war file. Follow instructions at
http://www.unidata.ucar.edu/projects/THREDDS/tech/dodsAS/AggServerInstall.html
validation page is at
http://motherlode.ucar.edu:8080/thredds/validateForm.html
I dont currently have a source distribution, i will try to make one in
the next few weeks.
It can be hard to get the config files right. Send us a copy of yours
and we can have a look. Send to yuanho@xxxxxxxxxxxxxxxx and cc me.
