On 11-04-12 10:24 AM, kingkastle wrote:
Greetings,
I'm working with hdf5 file with the following attributes:
(obtained with hdfview)
http://osgeo-org.1803224.n2.nabble.com/file/n6265339/hdf5view.bmp
However, when I gdalinfo the file, I get the following information:
Driver: HDF5Image/HDF5 Dataset
Files: none associated
Size is 1701, 651
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9108"]],
AUTHORITY["EPSG","4326"]]
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 651.0)
Upper Right ( 1701.0, 0.0)
Lower Right ( 1701.0, 651.0)
Center ( 850.5, 325.5)
...
So, basically I can't see in the gdalinfo the following information:
+) Proyection used
+) Origin
+) Pixel size
In fact, when I do gdal-translate the file created is not georeferenced
rightly.
In my opinion, the problem is that the hdf5 attributes are imcomplete or not
rightly defined,
Please let me know your opinion
Many thanks in advance and best regards,
Rafa,
One challenge with HDF5 (and HDF4) products is that coordinate system
and other georeferencing metadata may be included in a wide variety of
forms. This aspect is not well standardized - or at least the standards
that exist are often not followed. So, in this case, GDAL is not able
to deduce the coordinate system or geotransform. It seems like there
*might* be enough metadata available to construct coordinate system
information for this dataset but it would likely require a fair amount
of fooling around to implement and verify.
If the data is public you might want to file a GDAL ticket with a pointer
to the dataset and the metadata report along with a request to support
this georeferencing format. But I must confess I am unlikely to work
on it unless I have client interest.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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