[gdal-dev] gdalinfo doesn't show GEOS projection info
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) Band 1 Block=1701x1 Type=Int16, ColorInterp=Undefined Metadata: DSSF:CLASS=Data DSSF:PRODUCT=DSSF DSSF:PRODUCT_ID=111 DSSF:N_COLS=1701 DSSF:N_LINES=651 DSSF:NB_BYTES=2 DSSF:SCALING_FACTOR=10 DSSF:OFFSET=0 DSSF:MISSING_VALUE=-1 DSSF:UNITS=W/m**2 DSSF:CAL_SLOPE=1 DSSF:CAL_OFFSET=0 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 -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/gdalinfo-doesn-t-show-GEOS-projection-info-tp6265339p6265339.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdalinfo doesn't show GEOS projection info
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, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush| Geospatial Programmer for Rent ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdalinfo doesn't show GEOS projection info
Hi Rafa According to my research on this matter, these HDF5 files (from LANDSAF, I presume) are not georeferenced in a way that GDAL can recognize. There is in fact some information regarding the coordinate system in the HDF5 file, but it is stored on the metadata of the root of the HDF5 file, which is something that GDAL can't read (at least my 1.7.3 version can't). The solution I have found for this is to use some other program (in my case, the pytables python module) to extract this information. After having this info it is still necessary to add some GCPs to the files, in order to georeference them (still with the GEOS projection) in a way that is understandable by GDAL. In order to obtain the coordinates of the GCPs, I am using some reference formulas from the LANDSAF PUMs, which will convert from pixel coordinate to latlon and then proj4's cs2cs utility to convert them to the GEOS projection. Finally I use the gdal_translate utility to add the GCPs to the file. In the end, a gdalwarp can be used to reproject the file from GEOS projection to another projection. This is basically what I am doing in the script that I sent you (off-list). If someone has another technique for georeferencing LANDSAF HDF5 files I'd also be very interesetd in it ;) Best regards On Tue, Apr 12, 2011 at 3:24 PM, kingkastle kingkastle4...@gmail.com 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) Band 1 Block=1701x1 Type=Int16, ColorInterp=Undefined Metadata: DSSF:CLASS=Data DSSF:PRODUCT=DSSF DSSF:PRODUCT_ID=111 DSSF:N_COLS=1701 DSSF:N_LINES=651 DSSF:NB_BYTES=2 DSSF:SCALING_FACTOR=10 DSSF:OFFSET=0 DSSF:MISSING_VALUE=-1 DSSF:UNITS=W/m**2 DSSF:CAL_SLOPE=1 DSSF:CAL_OFFSET=0 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 -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/gdalinfo-doesn-t-show-GEOS-projection-info-tp6265339p6265339.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- ___ ___ __ Ricardo Garcia Silva ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
