[R] Connecting to PostgreSQL/PostGIS from R (rgdal?)

From: Mike Leahy <mgleahy_at_alumni.uwaterloo.ca>
Date: Wed, 30 May 2007 16:11:00 -0300


Hello,

I've been trying every now and then to find a cross operating system solution that would let me access PostgreSQL (and PostGIS) from R, or to access R from PostgreSQL. I know of pl/r, which accomplishes the latter, but has yet to be successfully ported to Windows. Similarly, I've tried to use Rdbi and DBI, but I haven't had luck with those on Windows either for connecting to PostgreSQL from R. Can anyone suggest a solution for this?

It would seem that rgdal could also help me in this case. Unfortunately, the version of the GDAL library that is included in the rdgal binary available on CRAN (for windows) doesn't include the PostgreSQL driver for OGR (i.e., it's not listed by the ogrDrivers() function).

I compiled rgdal on Windows myself using the GDAL library from FWTools-1.3.1, but I was unsuccessful at creating a proper binary package for R. I was only able to get it to work by substituting the rgdal.dll that was installed by CRAN with the one that I compiled that links against the GDAL library from FWTools. Even though it works (at first glance with ogrInfo(), and readOGR()), I still get a warning message when I load the libary: "DLL attempted to change FPU control word from 8001f to 9001f".

So my question with respect to rgdal is a) is it likely that an rgdal package is going to be released in the future with the PostgreSQL driver included in GDAL/OGR, or b) are there any suggestions/instructions that might get me through the compilation and packaging process for rgdal with better success?

Thanks in advance for any help,
Mike



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