[mapserver-users] Mapfile HDF 'DATA' element format

[Frank Warmerdam]

Peter Willis wrote:
> Hello,
> 
> Where can I find the specification for the
> 'DATA' entry in mapserver MAP files where
> HDF files are being used?
> 
> I am mostly interested in using these in
> the context of WCS.
> 
> Here is my current non-working example of an HDF
> file test in my current WCS map file:
...
>   DATA 'HDF4:/public/A20081932008200.L3m_8D_CHLO_9.hdf://l3m_data'

Peter,

You need to use the gdalinfo command on the .hdf base file to get
a list of subdatasets within the file.  If the gdalinfo reports something
like:

 
SUBDATASET_16_NAME=HDF4_EOS:EOS_SWATH:"MOD07_L2.A2000110.0220.002.2000196104217.hdf":mod07:Retrieved_Moisture_Profile
   SUBDATASET_16_DESC=[20x406x270] Retrieved_Moisture_Profile mod07 (16-bit 
integer)
SUBDATASET_17_NAME=HDF4_EOS:EOS_SWATH:"MOD07_L2.A2000110.0220.002.2000196104217.hdf":mod07:Retrieved_Height_Profile
   SUBDATASET_17_DESC=[20x406x270] Retrieved_Height_Profile mod07 (16-bit integer)

Then you might put the following in your .map file:

   DATA 
'HDF4_EOS:EOS_SWATH:"MOD07_L2.A2000110.0220.002.2000196104217.hdf":mod07:Retrieved_Moisture_Profile'


The key is to use _NAME portion of the subdatasets reported by gdalinfo.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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