Re: [netcdf-java] netcdf-java 4.2 on netcdf-4 data

• To: netcdf-java@xxxxxxxxxxxxxxxx
• Subject: Re: [netcdf-java] netcdf-java 4.2 on netcdf-4 data
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Thu, 28 Oct 2010 17:35:02 -0600

On 10/28/2010 4:17 PM, Ying at NCCS wrote:

Hi John,

I run into this problem using netcdf-java toolsUI to open either local netcdf-4 file or via opendap, here is an example link

http://esg.nccs.nasa.gov/thredds/catalog/ying/readonly/catalog.html?dataset=ying/readonly/e562p1_fp.inst3_3d_asm_Nv.20100907_00z%2B20100909_1200z.nc4

 it just shows all -Infinity on the color-bar.

I was first having trouble to use NASA GISS Panoply (which uses netcdf-java), then I tried this recent version of netcdf-java 42. ToolsUI (downloaded from UNIDATA) --- it can read netcdf-4 file (the above link) but it shows same max and min values of each variable. As a result, it just gives a blank plot.

Then I tried toolsUI-4.2.jar  and it shows the same problem.


ftp://ftp.unidata.ucar.edu/pub/netcdf-java/v4.2/toolsUI-4.2.jar

by the way, I can use Ferret (most recent version) to open this netCDF-4 file and makes right plots.

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Hi Ying:

that file has this attribute on the data variables:

     :valid_range = 9.9999999E14f, 9.9999999E14f; // float

looking at a random variable:

   float SLP(time=1, lat=721, lon=1152);
     :_CoordinateAxes = "time lat lon ";
     :long_name = "sea_level_pressure";
     :units = "Pa";
     :_FillValue = 9.9999999E14f; // float
     :missing_value = 9.9999999E14f; // float
     :fmissing_value = 9.9999999E14f; // float
     :scale_factor = 1.0f; // float
     :add_offset = 0.0f; // float
     :standard_name = "sea_level_pressure";
     :vmin = 9.9999999E14f; // float
     :vmax = 9.9999999E14f; // float
     :valid_range = 9.9999999E14f, 9.9999999E14f; // float

i would say that it would be better to have:

   float SLP(time=1, lat=721, lon=1152);
     :long_name = "sea_level_pressure";
     :units = "Pa";
     :_FillValue = 9.9999999E14f; // float
     :fmissing_value = 9.9999999E14f; // float
     :standard_name = "sea_level_pressure";
     :vmin = 9.9999999E14f; // float
     :vmax = 9.9999999E14f; // float

John

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  • [netcdf-java] netcdf-java 4.2 on netcdf-4 data
    • From: Ying at NCCS