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Re: [netCDFJava #UUN-799950]: "Unable to find center point variables" problem

Rich-

This falls into the general category of the problems of how the
IDV handles the dimensionless vertical coordinate.  I have no
solution for this problem that would allow accurate interpretation
of the data.  If we ignore the non-griddedness of the data, then
any resampling or interpolation of the data is apt to be faulty.

Sorry.

Don

Rich Signell wrote:

John,

Sheesh!   Yes, adding "CF-1.0" attribute got rid of that problem, and
now when I try an isosurface of temperature on

http://stellwagen.er.usgs.gov/models/test/ecom_test.ncml

I have the old "samples do not form a valid grid" again.   But at
least that makes sense, as this NCML version should function the same
was as the NetCDF file that I modified.   You guys are still trying to
figure this one out, right?

Visad.SetException: Gridded3DSet: samples do not form a valid grid (66,0,0)
        at visad.Gridded3DSet.<init>(Gridded3DSet.java:327)
        at visad.GriddedSet.create(GriddedSet.java:218)
        at visad.GriddedSet.create(GriddedSet.java:130)
        at 
visad.EmpiricalCoordinateSystem.ensureNoCoordinateSystem(EmpiricalCoordinateSystem.java:108)
        at 
visad.EmpiricalCoordinateSystem.<init>(EmpiricalCoordinateSystem.java:81)
        at 
ucar.unidata.data.grid.GeoGridAdapter.makeDomainWithVerticalTransform(GeoGridAdapter.java:940)
        at 
ucar.unidata.data.grid.GeoGridAdapter.getSpatialDomainSet(GeoGridAdapter.java:419)
        at 
ucar.unidata.data.grid.GeoGridAdapter.getFlatField(GeoGridAdapter.java:1054)
        at 
ucar.unidata.data.grid.GeoGridAdapter.makeSequence(GeoGridAdapter.java:1211)
        at 
ucar.unidata.data.grid.GeoGridAdapter.getSequence(GeoGridAdapter.java:997)
        at 
ucar.unidata.data.grid.GeoGridDataSource.makeFieldImpl(GeoGridDataSource.java:1418)
        at 
ucar.unidata.data.grid.GeoGridDataSource.getDataInner(GeoGridDataSource.java:1134)
        at ucar.unidata.data.DataSourceImpl.getData(DataSourceImpl.java:2043)
        at ucar.unidata.data.DirectDataChoice.getData(DirectDataChoice.java:333)
        at ucar.unidata.data.DataChoice.getData(DataChoice.java:618)
        at ucar.unidata.data.DataInstance.getData(DataInstance.java:239)
        at ucar.unidata.data.DataInstance.getData(DataInstance.java:203)
        at 
ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:204)
        at 
ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:161)
        at 
ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:142)
        at 
ucar.unidata.idv.control.GridDisplayControl.doMakeDataInstance(GridDisplayControl.java:241)
        at 
ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:2875)
        at 
ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:2857)
        at 
ucar.unidata.idv.control.ThreeDSurfaceControl.setData(ThreeDSurfaceControl.java:250)
        at 
ucar.unidata.idv.control.ThreeDSurfaceControl.init(ThreeDSurfaceControl.java:156)
        at 
ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1229)
        at 
ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:967)
        at 
ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:948)
        at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:875)
        at ucar.unidata.util.Misc$3.run(Misc.java:1011)

Thanks,
-Rich

On Jan 8, 2008 7:02 PM, Unidata netCDF Java Support
<address@hidden> wrote:

John,

I think Don Murray passed this along, but the e-mail trail was quite
confusing, so here's the original question again, which still stands:

I have a NCML file that attempts to "CF-ize" a non-conforming NetCDF file:

http://stellwagen.er.usgs.gov/models/test/ecom_test.ncml

If I open this file in IDV 2.4, I can view the 2D fields like
"heat_flux" just fine, but when I try an isosurface of a 3D field like
"temp", I get the Error:

"Couldn't get data
Unable to find center point variables"

I haven't seen this error before.   Any ideas?

Thanks,
Rich

--
Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598



try adding the conventions attribute:

<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
  <aggregation type="union">
    <netcdf location="./ecom_lonlat.nc" />
    <netcdf location="./ecom_test.cdf">
      <variable name="temp">
        <attribute name="coordinates" type="String" value="lon lat sigma" />
      </variable>
      <variable name="sigma">
        <attribute name="standard_name" type="String" 
value="ocean_sigma_coordinate" />
        <attribute name="formula_terms" type="String" value="sigma: sigma eta: elev 
depth: depth" />
        <attribute name="positive" type="String" value="up" />
        <attribute name="units" type="String" value="1" />
      </variable>
      <attribute name="Conventions" value="CF-1.0"/>
    </netcdf>
  </aggregation>
</netcdf>

Ticket Details
===================
Ticket ID: UUN-799950
Department: Support netCDF Java
Priority: Normal
Status: Closed







--
*************************************************************
Don Murray                               UCAR Unidata Program
address@hidden                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************