Thanks. No problem, I use GRASS and was converting them using rgrass6. I just hoped there was an even simpler way. I had missed the posting on the change, but realised more or less what was going on a few days ago when I upgraded.
Duncan Roger Bivand wrote: >On Fri, 27 Oct 2006, Duncan Golicher wrote: > > > >>I have quite a number of SpatialGridDataFrame objects that were saved >>internally under R 2.3.0 and sp0.8-16. Can anyone suggest a quick and >>easy way to convert them for use with R2.4.0 and sp0.9-2. (I do have >>ways, but they are all a bit longwinded). >> >> > >The issue was announced on this list on 28 September: > >https://stat.ethz.ch/pipermail/r-sig-geo/2006-September/001354.html > >and has been on the Rgeo site since about the same time. > >The major issue is that the way new-style classes (and objects belonging >to those classes) are defined internally, so the internal (*.RData) >representations are not compatible. > >To transfer from the old internal form, use R < 2.4.0, and sp < 0.9 to for >example export column by column to GRASS, and then read back in in R >= >2.4.0 and sp >= 0.9. Alternatively for non-GRASS users, rgdal and the >GTiff fotmat could be used (and should work with multiple bands). The >writeAsciiGrid() function in maptools could also be used. There is no way >of upgrading the serialised object from the *.RData form directly. > >We know that this is an unfortunate incompatibility, but the changes in >the methods package are being made to improve class/object handling, >making the software faster and more robust, so the difficulties are >unavoidable. For critical projects already using R < 2.4.0, I suggest only >upgrading when sensible. > >Roger > > > >>Thanks, >> >>Duncan >> >> >> >> > > > -- Dr Duncan Golicher Ecologia y Sistematica Terrestre Conservación de la Biodiversidad El Colegio de la Frontera Sur San Cristobal de Las Casas, Chiapas, Mexico Email: [EMAIL PROTECTED] Tel: 967 674 9000 ext 1310 Fax: 967 678 2322 United Kingdom Skypein; 020 7870 6251 Skype name: duncangolicher _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo