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...lasses for spatial data should be helpful, both as an exchange platform and (later) as a required package for working with spatial data (compare the ts class for time series). I started writing such a package, and opened a sourceforge.net project for it, called r-spatial. I first worked with Barry Rowlinson's spatial.data.frame (found in r-asp, or rasp, also on sourceforge), which is an S3 class. Then I restarted using S4 classes, because they are here to stay, and allow validation. Currently I defined three classes: + SpatialData +-- SpatialDataFrame +-- SpatialDataFrameGrid Spati...

...y involves: - support of sp classes by several spatial statistics packages - automatic determination of hole polygons from shapefiles - plotting filled polygons with holes - gdal read/write support - GRASS 6.0 support The development of this package is a joint effort of Virgilio Gomez-Rubio, Barry Rowlinson, Roger Bivand and Edzer Pebesma, and followed from discussions held at a pre-DSC2003 workshop [3], announcements on R-sig-geo [4], and a meeting held last November in Lancaster [5]. A beta release of sp was announced a while ago on R-sig-geo [6]. With best regards, -- Roger Bivand and Edzer Pebesm...

...y involves: - support of sp classes by several spatial statistics packages - automatic determination of hole polygons from shapefiles - plotting filled polygons with holes - gdal read/write support - GRASS 6.0 support The development of this package is a joint effort of Virgilio Gomez-Rubio, Barry Rowlinson, Roger Bivand and Edzer Pebesma, and followed from discussions held at a pre-DSC2003 workshop [3], announcements on R-sig-geo [4], and a meeting held last November in Lancaster [5]. A beta release of sp was announced a while ago on R-sig-geo [6]. With best regards, -- Roger Bivand and Edzer Pebesm...