On Sat, 31 May 2008, Markus Neteler wrote:
Dear Roger,
On Sat, May 31, 2008 at 5:51 PM, Roger Bivand <[EMAIL PROTECTED]> wrote:
On Sat, 31 May 2008, Markus Neteler wrote:
Dear Roger, all,
I have to read in Lidar data from GRASS, so speed matters. I have
modified the readVECT6() function to not export to SHAPE but
read in directly via GRASS-GDAL/OGR plugin:
Dear Markus,
In theory maybe, but if I cannot make the plugin work (I use SELinux on F7
for trials, and I have not found out how to make it accept the *.so from
GRASS), then I don't think that it is going to be very helpful.
Sure. but I can help you if you like (got it running on various kinds of
machines). It's also documented:
http://grass.osgeo.org/wiki/Compile_and_install_GRASS_and_QGIS_with_GDAL/OGR_Plugin
Including machines with SELinux running? It is very picky with ldconfig.
My idea was: use it then it is present. That's just an additional
if condition in the code. I'll figure out how to test that (I guess that
readOGR() may know which drivers it has).
ogrDrivers() gives the installed drivers, but there would be more to do to
check the arguments to readOGR().
In addition, there is only a read driver, I believe.
Right. But accelerating read in would be quite welcome.
However, using readOGR() directly is fine, and as you show, is far superior
to intermediate files if available.
The plugin circular dependencies are a common reason for GDAL and rgdal not
working, I'm afraid.
I am not sure about this: I have all working here, just fetching things from
CRAN. GDAL should *not* be compiled with GRASS support. Then the
GDAL-GRASS plugin doesn't interfere and is only loaded on demand
internally from GRASS when the GRASS driver is called.
Aha, I've been compiling with GRASS support, which was the old way. I'll
try again.
Roger
Best wishes,
Markus
--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [EMAIL PROTECTED]
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