Re: Thredds uses

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 address@hidden and cc me.