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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
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.htmlI 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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