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[IDV #KQC-444299]: I probably don't have my NetCDF file setup

Hi Tim:

Thanks for your reply, it helps a lot to understand what your process is in
figuring out your problems. I understand how frustrating this can be. It
usually takes a dialogue. If you post to an email list, others can follow along
and learn also, plus there people like Rich who can help. So keeping the list
cc'ed is helpful. (note we are now in the support system, not the email list).

I can often figure out problems with projections quite quickly if I have a
sample file, the bundle is not that useful to me. Send one ( or post URL) and
Ill have a look.

Regards,
John

> Rich Signell has been very helpful and I think I am much closer to a final
product.
>
> My questions come from spending an embarrassing (and frustrating) amount of
time trying to get my data into a NetCDF file that works with the tools at hand
- specifically IDV/netcdf-java.  Discovering that gather compression wasn't
supported by many tools was quite a relief, but it didn't allow me to recover
the time spent.  Perhaps I didn't search the Internet thoroughly, but something
very helpful would be a list of which CF conventions are supported.
>
> Because of Rich Signell's help I discovered the problem with the CDL below,
though what I am working with now is very different and modeled slavishly after
the ROMS output NetCDF.  IDV now brings in my dataset with only one remaining
problem having to do with the projection (incredibly large latitude and 'NA'
for longitude).  ROMS isn't projected and so I don't have an example of
combining 2-D lat/lon coordinates with a projection. What I am going to do is
to calculate the lat/lon outside of NetCDF instead of trying to puzzle out how
to have a projection.  Not the best solution, but workable and something that I
can finish today.
>
> Are you John Caron?  If so thank you very much for the information on gather
compression and I will indeed use the NetCDF4 compression.  I apologize for not
posting a reply, but I felt that I needed to first put in the effort to get
everything working.
>
> Kindest regards,
> Tim Cera
>
>
> -----Original Message-----
> From: Unidata netCDF Java Support
[mailto:address@hidden]
> Sent: Sunday, April 19, 2009 11:25 PM
> To: Tim Cera
> Cc: address@hidden
> Subject: [IDV #KQC-444299]: I probably don't have my NetCDF file setup
correctly...
>
> Tim, you've asked 4 questions on 4 different lists; all of them come to me.
Ive answered you twice, with some questions to you that you havent answered.
Rich Signell also took time to answer you, with no response from you ASAIK. Can
you explain yourself?
>
>
> > Full Name: Tim Cera
> > Email Address: address@hidden
> > Organization: St. Johns River Water Management District
> > Package Version: 2.6u2 build date:2009-02-13 19:03 UTC
> > Operating System: Windows XP
> > Hardware: Java: home: c:\Program Files\Java\jre6 version: 1.6.0_13
j3d:1.5.2 fcs (build4)
> > Description of problem: There was an error loading the data:
> > Error creating data source:netcdf.grid with:
T:\work\efdc_src\test\efdcout.nc
> > GridCoordSystem.findXYindexFromCoord
> >
> > Here is my CDL:
> >
> > netcdf efdcout {
> > dimensions:
> > IC = 259 ;
> > JC = 121 ;
> > xc = 259 ;
> > yc = 121 ;
> > nv = 4 ;
> > time = UNLIMITED ; // (2 currently)
> > variables:
> > int transverse_mercator ;
> > transverse_mercator:grid_mapping_name = "transverse_mercator" ;
> > transverse_mercator:latitude_of_projection_origin = 0. ;
> > transverse_mercator:longitude_of_central_meridian = -81. ;
> > transverse_mercator:false_easting = 500000. ;
> > transverse_mercator:false_northing = 0. ;
> > transverse_mercator:scale_factor_at_central_meridian = 0.9996 ;
> > float WSElevation(time, yc, xc) ;
> > WSElevation:standard_name = "height_above_reference_ellipsoid" ;
> > WSElevation:units = "m" ;
> > WSElevation:coordinates = "x y" ;
> > WSElevation:grid_mapping = "transverse_mercator" ;
> > float x(yc, xc) ;
> > x:standard_name = "projection_x_coordinate" ;
> > x:units = "m" ;
> > x:bounds = "x_bnds" ;
> > float y(yc, xc) ;
> > y:standard_name = "projection_y_coordinate" ;
> > y:units = "m" ;
> > y:bounds = "y_bnds" ;
> > float x_bnds(yc, xc, nv) ;
> > float y_bnds(yc, xc, nv) ;
> > double time(time) ;
> > time:standard_name = "time" ;
> > time:units = "days since 1995-1-1 0:0:0" ;
> >
> > // global attributes:
> > :Conventions = "CF-1.0" ;
> > }
> >
> >
> > ******************
> > Stack trace:
> > java.lang.IllegalStateException: GridCoordSystem.findXYindexFromCoord
> > at
ucar.nc2.dt.grid.GridCoordSys.findXYindexFromCoord(GridCoordSys.java:697)
> > at
ucar.nc2.dt.grid.GridCoordSys.findXYindexFromLatLon(GridCoordSys.java:712)
> > at
ucar.nc2.dt.grid.GridCoordSys.getLatLonBoundingBox(GridCoordSys.java:997)
> > at
ucar.unidata.data.grid.GeoGridDataSource.makeDataChoiceFromGeoGrid(GeoGridDataSource.java:1593)
> > at
ucar.unidata.data.grid.GeoGridDataSource.doMakeDataChoices(GeoGridDataSource.java:1128)
> > at
ucar.unidata.data.DataSourceImpl.getDataChoices(DataSourceImpl.java:1725)
> > at ucar.unidata.data.DataManager.createDataSource(DataManager.java:1472)
> > at
ucar.unidata.idv.IntegratedDataViewer.createDataSource(IntegratedDataViewer.java:1948)
> > at
ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java:1865)
> > at
ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java:1799)
> > at
ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java:1772)
> > at ucar.unidata.idv.chooser.IdvChooser.makeDataSource(IdvChooser.java:839)
> > at
ucar.unidata.idv.chooser.FileChooser.selectFilesInner(FileChooser.java:646)
> > at ucar.unidata.idv.chooser.FileChooser.selectFiles(FileChooser.java:515)
> > at
ucar.unidata.idv.chooser.FileChooser.doLoadInThread(FileChooser.java:537)
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> > at java.lang.reflect.Method.invoke(Unknown Source)
> > at ucar.unidata.util.Misc$2.run(Misc.java:1010)
> > at ucar.unidata.util.Misc$3.run(Misc.java:1038)
> >
> >
> >
>
>
> Ticket Details
> ===================
> Ticket ID: KQC-444299
> Department: Support netCDF Java
> Priority: Normal
> Status: Open
>
>


Ticket Details
===================
Ticket ID: KQC-444299
Department: Support netCDF Java
Priority: Normal
Status: Open