Clipping a NetCDF File in 2.2

[John Caron]

Hi Jonathon:

MultiArray is no longer used. Have a look at the tutorial and see if that helps you get started:

  http://www.unidata.ucar.edu/software/netcdf-java/tutorial/

esp:

  http://www.unidata.ucar.edu/software/netcdf-java/tutorial/NetcdfFile.html

Johnathan Kool wrote:
> There’s probably a simple solution to this, but it’s escaping me, so I 
> thought I’d try posting.  I’ve managed to successfully load in my NetCDF 
> files using the NetCDF API 2.2, and am now trying to extract a subset of 
> data from them – exactly what the MultiArrayProxy and ClipMap functions 
> provide (see: 
> http://www.unidata.ucar.edu/support/help/MailArchives/netcdf/msg00043.html) 
> , but I’m at a loss as to how to generate a MultiArray from the original 
> NetCDF data.  I’ve come across examples of how to generate MultiArrays 
> from scratch, and I can extract Arrays from my data, but not 
> MultiArrays.  It also looks like MultiArrays are possibly an older 
> feature(?), so there may be a better, more up-to-date way that I’m missing.
> 
>  
> 
> These are my variables:
> 
>  
> 
> [   float Longitude(Longitude=2294);
> 
>      :units = "degrees_east";
> 
>      :valid_range = 98.84f, 282.28f; // float
> 
>      :step = 0.8f; // float
> 
>      :standard_name = "longitude";
> 
>      :axis = "x";
> 
> ,    float Latitude(Latitude=1362);
> 
>      :units = "degrees_north";
> 
>      :valid_range = -20.057325f, 65.86738f; // float
> 
>      :step = 0.8f; // float
> 
>      :standard_name = "latitude";
> 
>      :axis = "y";
> 
> ,    int layer(layer=20);
> 
>      :units = "layer";
> 
> ,    float uvel(layer=20, Latitude=1362, Longitude=2294);
> 
>      :_FillValue = 1.0E34f; // float
> 
>      :units = "ms-1";
> 
>      :standard_name = "eastward_sea_water_velocity";
> 
>      :long_name = "eastward_sea_water_velocity";
> 
>      :unit_long = "meter_per_second";
> 
>      :missing_value = 1.0E34f; // float
> 
>      :valid_range = -229.31992f, 80.65831f; // float
> 
> ]
> 
>  
> 
> And I’m looking to subset uvel based on Latitude, Longitude and layer 
> (e.g. if Lat ranges from 20-40, Lon from 0-10 and layer from 0-10, I’d 
> like to extract the uvels for 25-35, 3-7 and 5-8 respectively).  Any 
> constructive advice, examples or links would definitely be appreciated.
> 
>  
> 
> Thank you!
> 
>  
> 
> J
> 

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