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 yuanho@xxxxxxxxxxxxxxxx and cc me.


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