Suggestion: option overwrite=T for writeOGR()

Roger,

It does not for me. The error is solved by deleting files xygcatLO.* ,
while directory xygcatLO may continue to exist.

Also, I've found that with this version the below command does not
save the files within
the folder indicated by dsn, but outside. This was not the case in the
past, but do not know if this is
because of a change in rgdal, gdal or ubuntu 10.04 (I've changed all 3
since the last time I used writeOGR()).

writeOGR(xygcatLO,dsn="xygcatLO",layer="xygcatLO", driver="ESRI Shapefile")

Error in writeOGR(xygcatLO, dsn = "xygcatLO", layer = "xygcatLO",
driver = "ESRI Shapefile") :

	GDAL Error 1: Layer 'xygcatLO' already exists
Calls: writeOGR -> .Call

sessionInfo()

R version 2.12.0 (2010-10-15)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.utf8          LC_NUMERIC=C
 [3] LC_TIME=en_US.utf8           LC_COLLATE=en_US.utf8
 [5] LC_MONETARY=en_US.utf8       LC_MESSAGES=en_US.utf8
 [7] LC_PAPER=en_US.utf8          LC_NAME=en_US.utf8
 [9] LC_ADDRESS=en_US.utf8        LC_TELEPHONE=en_US.utf8
[11] LC_MEASUREMENT=en_US.utf8    LC_IDENTIFICATION=en_US.utf8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] RANN_2.1.2      outliers_0.13-3 rgdal_0.6-30    raster_1.7-2
[5] sp_0.9-73       rkward_0.5.4

loaded via a namespace (and not attached):
[1] grid_2.12.0     lattice_0.19-13 tools_2.12.0
2010/12/10 Roger Bivand <Roger.Bivand at nhh.no>:

On Thu, 9 Dec 2010, Barry Rowlingson wrote:

On Thu, Dec 9, 2010 at 8:56 AM, Agustin Lobo <alobolistas at gmail.com>
wrote:

Hi!

Could an option overwrite=T (default overwrite=F) be included in
writeOGR()?
Thanks!

Submit a Feature Request here:

http://sourceforge.net/tracker/?group_id=84716&atid=573625

No, rgdal is on R-Forge, and a list called rgdal-devel will be available
from tomorrow.

It looks like it just needs to be a wrapper around OGR's delete layer
function.

Contributions welcome. Note that the facility is present for rasters, which
I fould out by accidentally deleting GRASS database objects (for which of
course I did not have backups). Is this really needed - which drivers do not
already overwrite without complaint? These do not complain for me:
driver="ESRI Shapefile"; driver="KML"; driver="MapInfo File";
driver="MapInfo File", dataset_options="FORMAT=MIF".

Hope this helps,

Roger

Barry

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--
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: Roger.Bivand at nhh.no

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