Hi Even,
On 9/6/12 12:05 PM, Even Rouault wrote:
Selon Ivan Lucena <ivan.luc...@princeton-ma.us>:
Hi Alisson,
How did that dbf was create?
Can you run ogrinfo and report it back to us?
gdalinfo file-name.dbf
Ivan certainly meant : ogrinfo file-name.dbf
Oops.
What as I thinking? :|
That is right Allison. I meant to say ogrinfo.
Is there a .shp file associated with that dbf?
To my knowledge, there's no GDAL driver that directly manages attributes that
would be associated and contained in a DBF file. The correlation between the
raster and attribute information must be done by the user and/or other tools.
I vaguely remember that some GIS software used to create a raster
attribute table in DBF when the image was thematic or if it has some
histogram associated. Was it ArcView by any chance? Since Allison is in
Brazil, another possibility is that the raster is associated with DBF
through SPRING or TerraLib. If that is the case GDAL is not going to
read it. But that is also old school. I don't think they use DBF it
anymore. There is just one thing that keep DBF alive and that is the
Shapefiles.
Anyway, there is just a few drivers in GDAL that support Raster
Attribute Table:
$ grep -l GDALRasterAttributeTable frmts/*/*.cpp
frmts/aigrid/aigdataset.cpp
frmts/georaster/georaster_dataset.cpp
frmts/hfa/hfadataset.cpp
frmts/idrisi/IdrisiDataset.cpp
frmts/raw/idadataset.cpp
But they store the RAT on their own data storage. Not on DBF files. I
wrote two of those drivers and I think I could identify a RAT if you
send the ogrinfo report.
So if you got a .TIF, for example, with a .DBF associated to it (same
base name) hopefully you could convert the data to one of those formats
then GDAL will be able to read it.
Another possibility is that the GDAL PAMDataset could store RAT in
auxiliary xml files, so you can keep the raster data as it is. The
problem is that you would need to convert the content of your DBF to the
PAMDataset schema.
Does it makes sense Even?
Regards,
Ivan
Regards,
Ivan
-------Original Message-------
From: Alisson Barbosa <alisson.u...@gmail.com>
To: gdal-dev@lists.osgeo.org
Subject: [gdal-dev] DBF file associated with Raster
Sent: Sep 06 '12 08:59
Hi,
I want to know how to read the attributes of a dbf file associated with a
raster using GDAL.
Regards,
--
Alisson Barbosa
Systems Analyst - FUNCEME - Brazil
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