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Re: HDF object/tag retrieval [message #55866 is a reply to message #55860]

Tue, 18 September 2007 07:26

liamgumley
Messages: 74
Registered: June 2005

Member

Dear Jelle,

The following IDL function is designed to extract a single PVL object
from a PVL formatted string, such as the CoreMetadata.0 global
attribute in MODIS HDF files.

ftp://ftp.ssec.wisc.edu/pub/incoming/get_metadata.pro

Here's an example. Note that hdf_sd_attinfo.pro is available from
http://gumley.com/PIP/Free_Software.html.

; Read a global attribute containing global metadata
file = 'MOD021KM.A2000115.1710.002.2000119195542.hdf'
hdfid = hdf_sd_start(file)
info = hdf_sd_attinfo(hdfid, '', 'CoreMetadata.0', /global)
hdf_sd_end, hdfid

; Extract a PVL object
pvlstring = info.data
objstring = 'RANGEBEGINNINGDATE'
result = get_metadata(pvlstring, objstring)
print, result

On a final note, you might be able to find a better tool for creating
GeoTIFF files from the MYD09A1 product. Here are a few options.

HDFLook
http://www-loa.univ-lille1.fr/Hdflook/hdflook_gb.html

MRTSwath
http://edcdaac.usgs.gov/landdaac/tools/mrtswath/

HEG
http://newsroom.gsfc.nasa.gov/sdptoolkit/HEG/HEGHome.html

Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/

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[Message index]

		Re: HDF object/tag retrieval By: James Kuyper on Tue, 18 September 2007 09:17
		Re: HDF object/tag retrieval By: leatherback on Tue, 18 September 2007 08:54
		Re: HDF object/tag retrieval By: liamgumley on Tue, 18 September 2007 07:26
		Re: HDF object/tag retrieval By: David Fanning on Tue, 18 September 2007 07:26
		Re: HDF object/tag retrieval By: leatherback on Tue, 18 September 2007 07:25
		Re: HDF object/tag retrieval By: David Fanning on Tue, 18 September 2007 07:19
		Re: HDF object/tag retrieval By: leatherback on Tue, 18 September 2007 07:12
		Re: HDF object/tag retrieval By: David Fanning on Tue, 18 September 2007 06:17

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