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20030226: MARS netCDF file

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  • Subject: 20030226: MARS netCDF file
  • Date: Thu, 26 Feb 2004 16:29:31 -0700
Hi again-

I was able to use an NcML file to read in your netCDF file.
NcML is a new facility that allows one to add in extra metadata
to a netCDF file.  You can find out more about NcML at:

http://www.unidata.ucar.edu/packages/netcdf/ncml/

Basically, I created a file that specified the location of the
netCDF file and added in a unit specification for the time
dimension.  I've attached the file to this message.  To use
it:

1) save it from this message to somewhere on your disk.
2) edit the NcML file and change the file location to wherever
your netCDF file is located.
3) Start the IDV.
4) Use the Data->New Data Source... menu to bring up the
Data Source Selector.
5) From the Files/URLs tab, change the Data Source Type from "Default"
to "Netcdf grid files" (in the next release we'll specify that .ncml
files will use this by default).
6) Use the file chooser to find the ncml file that you edited
and click the Open button.

This will load the data source into the IDV and will have the
correct times listed.

This is sort of a hack since the times are really HHMM rather
than centihours, but since the minutes are all 00, it works.

If you have any questions, please let us know.

Don Murray
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<?xml version="1.0" encoding="UTF-8"?>
<nc:netcdf xmlns:nc="http://www.ucar.edu/schemas/netcdf";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xsi:schemaLocation="http://www.ucar.edu/schemas/netcdf 
http://www.unidata.ucar.edu/schemas/netcdfDataset2.xsd"; 
    uri="file:///C:/tmp/temp_air_01082000.nc">

  <nc:readMetadata>
    <nc:readVariable name="time">
      <nc:attribute name="units" type="string" value="centihours since 
2000-08-01 00:00:00.0"/>
    </nc:readVariable >
  </nc:readMetadata>
</nc:netcdf>