Re: [idvusers] Unable to create working 3D netcdf field

• To: wsession@xxxxxxxxxxx
• Subject: Re: [idvusers] Unable to create working 3D netcdf field
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Sat, 10 Jul 2010 14:42:33 -0600

the local file is working ok for me as a gridded file in idv 2.9. i only see 
one data field:

 float aerosol_extinction(time=2, height=25, lat=180, lon=360);
    :long_name = "aerosol extinction";
    :units = "1/km";
    :coordinates = "altitude longitude latitude";

im not sure how you generate the error.

wsession@xxxxxxxxxxx wrote:

I've placed a copy of a file getting the same error at:
http://fuelberg.met.fsu.edu/pub/wsession/idv_test.nc

This file contains two versions of the extinction 3D field - one using an
arbitrary vertical height coordinate and one using the correct model sigma
coordinates.  Attempting to plot a 3D isosurface with the sigma version
produces the error.

Cheers, WS

On 6/10/2010 12:56 PM, wsession@xxxxxxxxxxx wrote:
When I attempt to create a 3D isosurface, I get the following error:

Couldn't get data
SampledSet.init_samples: sample#2 length 1620000 doesn't match expected
length 1624500

The netcdf file is a lat/lon grid (-179.5-179.5 W/E, -89.5-89.5 S/N   1x1
deg) with 25 vertical sigma levels.  The 3D fields I'm interested in are
pressure and extinction (sigma x lat x lon).  The file opens fine in
NCVIEW, NCL, and IDL, so this may be a CF standards issue.

IDV 2.8u1 on RH Linux.

Here is the ncdump header information for the file, if this helps:

netcdf farop {
dimensions:
         lon = 360 ;
         lat = 180 ;
         sigma = 25 ;
variables:
         float longitude(lon) ;
                 longitude:long_name = "longitude" ;
                 longitude:standard_name = "longitude" ;
                 longitude:units = "degrees_east" ;
         float latitude(lat) ;
                 latitude:long_name = "latitude" ;
                 latitude:standard_name = "latitude" ;
                 latitude:units = "degrees_north" ;
         float pressure(sigma, lat, lon) ;
                 pressure:long_name = "pressure" ;
                 pressure:units = "hPa" ;
                 pressure:positive = "down" ;
                 pressure:standard_name = "air_pressure" ;
         float surface_pressure(lat, lon) ;
                 surface_pressure:long_name = "surface pressure" ;
                 surface_pressure:units = "hPa" ;
                 surface_pressure:coordinates = "longitude latitude" ;
         float aerosol_extinction(sigma, lat, lon) ;
                 aerosol_extinction:long_name = "aerosol extinction" ;
                 aerosol_extinction:units = "1/m" ;
                 aerosol_extinction:coordinates = "pressure longitude
latitude" ;
         float ptop ;
                 ptop:long_name = "pressure at top of model" ;
                 ptop:units = "hPa" ;
         float sigma(sigma) ;
                 sigma:long_name = "sigma at layer midpoints" ;
                 sigma:standard_name = "atmosphere_sigma_coordinate" ;
                 sigma:formula_terms = "sigma: sigma ps: surface_pressure
ptop: ptop" ;

// global attributes:
                 :Conventions = "CF-1.0" ;
}


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Hi:

Can you put the file on an HTTP or FTP server so we can download? thanks

John

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• References:
  • Re: [idvusers] Unable to create working 3D netcdf field
    • From: wsession