At 9:00 AM +0000 12/4/07, Barry Rowlingson wrote: >Agustin Lobo wrote: >> Hi! >> >> Does anyone has experience at displaying spatial R objects >> with QGis (perhaps using the python console + Rpy or RSpython)? >> I'm thinking on starting some testing and would like to know >> about previous experiences. > > I've done a bit of work on this and I think the current best option >would be to save the R Spatial objects as shapefiles and then load them >into QGis. For raster data I save as ESRI Ascii Grid format. > > Here's some other ideas: > > * write a data provider for QGis in Python that uses Rpy to fetch the >data from an R Spatial object stored in a .RData file.
For what (little?) it's worth, I have been doing this quite a bit, lately. I sometimes edit the objects in QGis, then reload them into R. > Advantages: neat and well-integrated > > Disadvantages: tricky. might need some changes to the QGis C++ >codebase. Only works in QGis. > > * write a GDAL/OGR driver for R Spatial objects. > > Advantages: every project that uses GDAL/OGR can use it. Frank >Warmerdam would think it's a good idea. > > Disadvantages: would have to be in C++, I'm not sure how to write >GDAL/OGR drivers that use external libraries (libR.so in this case). > >I think writing the GDAL/OGR driver would be the right thing in this >case, but it would require someone with lots of R and C experience to >code it up. Start here: http://www.gdal.org/ogr/ogr_drivertut.html > >Barry > >_______________________________________________ >R-sig-Geo mailing list >[EMAIL PROTECTED] >https://stat.ethz.ch/mailman/listinfo/r-sig-geo -- --------------------------------- Don MacQueen Lawrence Livermore National Laboratory Livermore, CA, USA 925-423-1062 [EMAIL PROTECTED] --------------------------------- _______________________________________________ Qgis-user mailing list [email protected] http://lists.qgis.org/cgi-bin/mailman/listinfo/qgis-user
