On May 21, 2009, at 2:32 PM, Frank Warmerdam wrote:
Jeff Hamann wrote:
Frank,
I was trying to use the las2ogr tool, and wanted to export the
results to a PostGIS database I have developed and noticed that the
las2ogr tool only exported shapefiles. I've had some experience
adding additional tags (timestamps) into the KML outputs for OGR,
but haven't worked with much of the gdal/ogr code beyond that. I
think I've got the chops to wire it up, but have no time (read
cash) to pay for it and so I've decided I have to do it myself. I
know I can export the las files to shapefiles, and import the
shapefiles that way, but would like to read the las files directly
into my database. Any suggestions would be great and I would like
to contribute to gdal/ogr very much.
Jeff,
I have taken the liberty of cc:ing Howard Butler who I presume is
the author
of las2ogr.
In *theory* it should be pretty straight forward to alter the las2ogr
code a bit to use the PG driver instead of the "ESRI Shapefile"
driver.
Actually, looking at the code:
http://liblas.org/browser/trunk/apps/las2ogr.cpp
It seems it already supports selecting alternate output drivers.
However,
it assumes it will always be creating the target datasource object
while
in the case of PostGIS we will want to open an existing database and
just
create a new layer.
Try altering:
OGRSFDriverH drv = OGRGetDriverByName(out_frmt.c_str());
if (0 == drv)
{
throw std::runtime_error(out_frmt + " driver not
available");
}
ogr_wrapper<OGRDataSourceH> ds(OGR_Dr_CreateDataSource(drv,
out_file.c_str(), 0), OGR_DS_Destroy);
To something like:
ogr_wrapper<OGRDataSourceH> ds( OGROpen( out_file.c_str(), TRUE,
NULL ));
Assuming out_file is the name of a postgres database - something like
"PG:dbname=warmerda ...", then it should be opened in update mode.
Then
(hopefully) all the rest of the stuff will just work.
Mateusz was actually the author of las2ogr.
These types of questions would best be asked on the liblas-devel
mailing list http://lists.osgeo.org/mailman/listinfo/liblas-devel ,
which I have cc'd here in case other wonder about such an issue.
We would gladly take a patch that would notices the user attempting to
use the PostGIS driver and switch from doing a CreateDataSource to an
OGROpen as appropriate.
Thanks,
Howard
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