/[MITgcm]/MITgcm_contrib/netcdf_matlab_examples/README.txt
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revision 1.1 by edhill, Tue Dec 30 04:31:52 2003 UTC revision 1.2 by edhill, Sat Jan 3 19:46:51 2004 UTC
# Line 25  which is described at: Line 25  which is described at:
25    
26  The key items for the use of NetCDF files within Ingrid are:  The key items for the use of NetCDF files within Ingrid are:
27    
28    1) In order to work with the Ingrid "plot land" option, dimensions    1) Although coordinate names such as "lat", "lon", "latitude",
29         etc. will work without any problems for plotting data, it seems
30         that the names "X" and "Y" sould be preferred for the coordinate
31         names so that calculations (eg. curl) can be applied to those
32         data sets.  For an example see:
33    
34           TRENBERTH_tau_mask/EH3_notes_mask.txt
35    
36         where both naming styles are used but the latter "X", "Y" naming
37         scheme should be preferred.
38    
39      2) In order to work with the Ingrid "plot land" option, dimensions
40       should have units of "degree_east" and "degree_north" as, for       should have units of "degree_east" and "degree_north" as, for
41       example, specified by:       example, specified by:
42    
43         nc{'lon'}.units = 'degree_east';         nc{'X'}.units = 'degree_east';
44         nc{'lat'}.units = 'degree_north';         nc{'Y'}.units = 'degree_north';
45    
46       The actual dimension names (eg. "lat" or "Y") are unimportant.       The actual dimension names (eg. "lat" or "Y") are unimportant.
47    
48    2) It is generally a good idea to set the "gridtype" to 1 or 0 to    3) It is generally a good idea to set the "gridtype" to 1 or 0 to
49       indicate that the coordinate "wraps" or not.  The gridtype       indicate that the coordinate "wraps" or not.  The gridtype
50       attribute allows Ingrid to, for instance, plot longitudinal data       attribute allows Ingrid to, for instance, plot longitudinal data
51       over "wrapped" ranges such as -100 to 500deg.  The attribute can       over "wrapped" ranges such as -100 to 500deg.  The attribute can
# Line 43  The key items for the use of NetCDF file Line 54  The key items for the use of NetCDF file
54         nc{'X'}.gridtype = ncint(1);         nc{'X'}.gridtype = ncint(1);
55         nc{'Y'}.gridtype = ncint(0);         nc{'Y'}.gridtype = ncint(0);
56    
57    3) Ingrid does seem to correctly handle the "_FillValue" attribute    4) Ingrid does seem to correctly handle the "_FillValue" attribute
58       and it can be set using a MatLAB command such as:       and it can be set using a MatLAB command such as:
59    
60         nc{ idu }.FillValue_ = ncdouble(-9999.0);         nc{ idu }.FillValue_ = ncdouble(-9999.0);
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