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Re: [netcdf-java] Rotated-pole data

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  • Subject: Re: [netcdf-java] Rotated-pole data
  • Date: Thu, 20 May 2010 10:48:29 -0600
try adding global attribute

 :Conventions = "CF-1.0"


if that doesnt work, send me the actual file.

On 5/20/2010 10:39 AM, Jon Blower wrote:

Hi,

I have some data in rotated-pole coordinates and I'm struggling to get
NetCDF-Java (latest 4.1 version) to recognise the coordinate system.  I
think I'm following CF except that I'm not providing values for the true
lon and lat values at each grid point.  I was assuming that if I
provided the grid mapping details that NetCDF-Java might recognise them
and be able to transform to and from true lat-lon without them (i.e.
this information is redundant).

However, when I load up the file in ToolUI (4.1) the projection (as
revealed under the tabs FeatureTypes->Grids) remains LatLon.

The CDL is at the end of the email.  What am I doing wrong?  Or is it in
fact compulsory to provide the true lon and lats at each grid point?

Thanks,
Jon

netcdf
file:C:/Godiva2_data/Rotated-pole/Stefano/04203_qwq111.oper00.pp_001.MOP
Su.ncml {
  dimensions:
    Longitude = 360;
    Latitude = 288;
    Surface = 1;
    Time = UNLIMITED;   // (4 currently)
  variables:
    float Longitude(Longitude=360);
      :units = "degrees";
      :long_name = "longitude in rotated-pole grid";
      :standard_name = "grid_longitude";
    float Latitude(Latitude=288);
      :units = "degrees";
      :long_name = "latitude in rotated-pole grid";
      :standard_name = "grid_latitude";
    float Surface(Surface=1);
      :units = "surface";
      :positive = "down";
    float Time(Time=4);
      :units = "days since 2007-07-26 11:00:00";
      :long_name = "time";
    float Dynamic_rainfall_rate(Time=4, Surface=1, Latitude=288,
Longitude=360);
      :units = "kg m-2 s-1";
      :long_name = "LARGE SCALE RAINFALL RATE KG M-2 S-1";
      :title = "LARGE SCALE RAINFALL RATE KG M-2 S-1";
      :source = "UM output";
      :missing_value = -32768.0f; // float
      :_FillValue = -32768.0f; // float
      :grid_mapping = "rotated_pole";
    char rotated_pole;
      :grid_mapping_name = "rotated_latitude_longitude";
      :grid_north_pole_latitude = "37.5";
      :grid_north_pole_longitude = "177.5";

  :History = "Created_by_convert_pp_2_netcdf_at_NCEO";
}

--
Dr Jon Blower
Technical Director, Reading e-Science Centre
Environmental Systems Science Centre
University of Reading
Harry Pitt Building, 3 Earley Gate
Reading RG6 6AL. UK
Tel: +44 (0)118 378 5213
Fax: +44 (0)118 378 6413
address@hidden
http://www.nerc-essc.ac.uk/People/Staff/Blower_J.htm


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