Steve,
I don't know the answer to your question about the size limit for
<values>, but there is another way to solve your problem..
You can write your lon,lat values to a netcdf file, and then use a
"union" aggregation that aggregates the "joinExisting"
aggregation with your grid file.
For example, if you have a bunch of files like:
mod_his_0001.nc
mod_his_0002.nc
...
and you create a netcdf file that contains the lon,lat variables:
lonlat.nc
you can aggregate them together like so:
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<!-- union the (1) time aggregation with the (2) grid file -->
<aggregation type="union">
<!-- (1) time aggregate files like "mod_his_0001.nc" -->
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<aggregation dimName="time" type="joinExisting">
<scan
location="/home/baum/models/run01/"
regExp=".*mod_his_[0-9]{4}\.nc$"/>
</aggregation>
</netcdf>
<!-- (2) grid file -->
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";
location="/home/baum/models/lonlat.nc"/>
</aggregation>
</netcdf>
Make sense?
-Rich
P.S. Can you please ask the same question on stackoverflow.com and tag
with "netcdf" and "xml"? I think as a community we should start to
get info like this captured in a place where others can comment and
improve the answers, and best answers can rise to the top. It's a lot
easier than wading through mailing lists. If you ask it, I promise to
answer. And I need to get up to 1500 points so I can add an "ncml"
tag. ;-)
On Thu, Feb 7, 2013 at 5:44 PM, Steven Baum <baum@xxxxxxxxxxxxxxxx> wrote:
>
> Is there a limit to the size or number of entries that can be placed within
> the values
> NcML element? I'm attempting to get a set of NetCDF files without lon/lat
> variables -
> but with x/y variables - to be read as a featureCollection by adding NcML
> entries of the
> form:
>
> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
>
> <variable name="lat_rho" shape="eta_rho xi_rho" type="float">
> <attribute name="units" type="String" value="degrees_north" />
> <values>[671x191 blankspace-separated latitudes here]</values>
> </variable>
>
> The lat and lon variables exist in a separate file and I've extracted them
> into single
> strings using ncks which I've stuck between appropriate <values></values>
> locations.
>
> The error messages in featureCollectionScan.log are:
>
> [2013-02-07T15:15:37.386-0600] ERROR ucar.nc2.ft.fmrc.Fmrc: makeFmrcInv
> java.lang.NullPointerException
>
> ....
>
> [2013-02-07T15:15:37.388-0600] ERROR ucar.nc2.ft.fmrc.Fmrc:
> /raid/data/txla_nesting6/.*\.nc$: makeFmrcInv failed
> java.lang.RuntimeException: java.lang.NullPointerException
>
> ....
>
> [2013-02-07T15:15:37.694-0600] WARN ucar.nc2.ft.fmrc.GridDatasetInv:
> GridDatasetInv
> using gds.getStartDate() for run date =%s
> [2013-02-07T15:15:37.694-0600] ERROR ucar.nc2.ft.fmrc.Fmrc: makeFmrcInv
> java.lang.NullPointerException
>
> ....
> [2013-02-07T15:15:37.695-0600] ERROR ucar.nc2.ft.fmrc.Fmrc:
> /raid/data/txla_nesting6/.*\.nc$: makeFmrcInv failed
> java.lang.RuntimeException: java.lang.NullPointerException
>
>
>
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--
Dr. Richard P. Signell (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598
