Re: NcML Aggregation

Joe McLean wrote:

> Hi John,
>
> I have an aggregation server (based on NcML) working at
> http://www.ferret.noaa.gov:9090/dodsC.
>
> The variables in the source URLS are shaped on the existing dimension
> 'recnum'.  I have added two more dimensions/coordinate variables to the
> Netcdf Dataset. They are  'lat' and 'lon', each are length="1".  Do you
> know of a way to use the NcML Dataset specification to add these two
> dimensions to the shape of an existing variable in the file?  Although
> documentation explains readMetadata and rename elements, there is no
> reshape element.  I'm guessing that is on purpose (reshaping variables
> asks for lots of problems), but maybe there is a work-around.
>
> Joe
>
> PS: I've been bugging you so much, is there a mailing list I should be
> on?
> ---------------------------
>
>  
Hi Joe.

I think that you dont want to add lat, lon to the existing variables, 
since that would make them into a grid. If I understand your data 
correctly, what you have is station data. So, if the lat, lon doesnt 
change for the station, then lat(1), lon(1) is right. If it changes, 
then the right thing to do is to add lat(recnum), lon(recnum) variables, 
which list the lat and lon for each measurement.

Actually, this depends on the conventions for describing station data, 
so you might want to run that by Steve Hankin and others who have beeen 
working on station data. We are starting to work on conventions in 
THREDDS and netCDF for station data, so I'd like to continue to be part 
of the conversation.