Re: [gdal-dev] subdatasets not read in a HDF file

Joaquim Luis Sun, 23 Oct 2011 11:55:02 -0700

Etienne,

1) Manage to attach the file (zipped) to the just opened ticket.

2) Unfortunately it doesn't work. It says the usual

C:\SVN\mironeWC>gdalinfo "NETCDF:S1998031140424.L2_MLAC_OC.x.hdf:longitude"
ERROR 4: `NETCDF:S1998031140424.L2_MLAC_OC.x.hdf:longitude' does not exist in the file system,

Note that I built GDAL with netcdf4 that on Windows is always linked against HDF.

Joaquim

1) Not sure, but give it a try! If not, put it somewhere accessible on the web. You should definitively create a ticket for this.

2)

netcdf supports HDF4 if it was configured for hdf4 support.

In that case, to force the netcdf driver you would have to use "NETCDF:filename:subdataset", or else the HDF4 driver will open it pick it up.

Etienne

On Sat, Oct 22, 2011 at 9:57 AM, Joaquim Luis <[email protected]> wrote:

Hi,

I'm having troubles reading a SeaWifs L2 hdf file due to a bug in the hdf driver. The problem here is that not all Subdatasets are read.
Below is the list givem by gdalinfo, which lacks 2 subdatasets: the
cntl_pt_cols & cntl_pt_rows
To prove I attach a little screencapture of "HDF Explorer".

Now I have two questions.

1- The hdf file in question is relatively small (1.2 Mb). Can I attach it to a ticket?

2- If I build GDAL with netCDF4, can I force the reading of this file with the netCDF driver? And if yes, how?

Thanks

Joaquim

Subdatasets:
SUBDATASET_1_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":11
SUBDATASET_1_DESC=[391x78] longitude (32-bit floating-point)
SUBDATASET_2_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":12
SUBDATASET_2_DESC=[391x78] latitude (32-bit floating-point)
SUBDATASET_3_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":13
SUBDATASET_3_DESC=[391x78] Rrs_412 (16-bit integer)
SUBDATASET_4_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":14
SUBDATASET_4_DESC=[391x78] Rrs_443 (16-bit integer)
SUBDATASET_5_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":15
SUBDATASET_5_DESC=[391x78] Rrs_490 (16-bit integer)
SUBDATASET_6_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":16
SUBDATASET_6_DESC=[391x78] Rrs_510 (16-bit integer)
SUBDATASET_7_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":17
SUBDATASET_7_DESC=[391x78] Rrs_555 (16-bit integer)
SUBDATASET_8_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":18
SUBDATASET_8_DESC=[391x78] Rrs_670 (16-bit integer)
SUBDATASET_9_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":19
SUBDATASET_9_DESC=[391x78] chlor_a (32-bit floating-point)
SUBDATASET_10_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":20
SUBDATASET_10_DESC=[391x78] Kd_490 (16-bit integer)
SUBDATASET_11_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":21
SUBDATASET_11_DESC=[391x78] pic (16-bit integer)
SUBDATASET_12_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":22
SUBDATASET_12_DESC=[391x78] poc (16-bit integer)
SUBDATASET_13_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":23
SUBDATASET_13_DESC=[391x78] cdom_index (16-bit integer)
SUBDATASET_14_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":24
SUBDATASET_14_DESC=[391x78] par (16-bit integer)
SUBDATASET_15_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":25
SUBDATASET_15_DESC=[391x78] l2_flags (32-bit integer)
SUBDATASET_16_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":34
SUBDATASET_16_DESC=[391x3] orb_vec (32-bit floating-point)
SUBDATASET_17_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":35
SUBDATASET_17_DESC=[391x3] sun_ref (32-bit floating-point)
SUBDATASET_18_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":36
SUBDATASET_18_DESC=[391x3] att_ang (32-bit floating-point)
SUBDATASET_19_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":37
SUBDATASET_19_DESC=[391x3x3] sen_mat (32-bit floating-point)
SUBDATASET_20_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":38
SUBDATASET_20_DESC=[391x6] scan_ell (32-bit floating-point)
SUBDATASET_21_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":39
SUBDATASET_21_DESC=[391x8] nflag (32-bit integer)
SUBDATASET_22_NAME=HDF4_SDS:SEAWIFS_L2:"S1998031140424.L2_MLAC_OC.x.hdf":42
SUBDATASET_22_DESC=[20x2] tilt_ranges (16-bit integer)
Corner Coordinates:

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Re: [gdal-dev] subdatasets not read in a HDF file

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