Hello. I found in your PDF file, http://www.bias-project.org.uk/ASDARcourse/unit0_slides.pdf.
In this document, you used interesting John Snow's "Cholera" map. Is this format ESRI's shapefile? Where is this file available? Once I've created Snow's shapefile(available form this site, http://giswin.geo.tsukuba.ac.jp/teacher/murayama/sdam/download.html(sorry in Japanese only)) from Dr. Tobler's original data(http://www.ncgia.ucsb.edu/pubs/snow/snow.html) with permission. Regards. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo