Reading HDF files with GrADS

[John Murray]

Dear All Grads 
Users,


 


I have been trying to open up an HDF 
file using GrADS.  The file does not 
conform to COARDS conventions since using ‘sdfopen’ results in an output, “no 
discernable X coordinate.”  Using 
xdfopen, extra information about the file can be provided in a .ctl file to 
direct Grads on how to open the file.  
However, with the .hdf file, I do not know the exact name of the variable 
that is going to get displayed.   
The file is a cylindrical equidistant projection.  At the bottom of the file, the latitude 
and longitude formulas are given a certain distance from a set latitude and 
longitude.  



 


There are other uncertainties I have 
with the .ctl file to describe the HDF file.  Is there any way to represent this 
projection?  I have seen options for 
PDEF that define polar stereographic and lambert conformal projections, but not 
any for cylindrical equidistant.  
The HDF files are coded the pixels for raster 8 images.  


 


I have one HDF file attached as well as 
my attempt at writing a .ctl file to read in this data.  This file still needs some work, so I 
was wondering if anyone has written or knows how to write a .ctl file to read in 
HDF data.


 


John Murray

 




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