[R-sig-Geo] plotting polygons of one shapefile in different colors?
cyndyh at nmsu.edu
Thu Sep 26 18:04:09 CEST 2013
Hi folks -
Pardon some real rank newbie questions; I am very well versed in using
ArcGIS but something of a newbie to R, and just starting out doing GIS in R.
I've installed sp, rgdal, and maptools, and now I'm trying to get some
I've been able to load a type of shapefile I am currently in need of working
with. It is a set of polygons, that are grouped into different strata that
may or may not be contiguous. There is a field in the shapefile that
denotes which polygons are grouped together. I hope it is clear what I
I can readily plot the entire polygon shapefile; what I have not been able
to work out is, how to access the field in the shapefile that groups them,
and plot each polygon group in a different color. In ArcGIS, my shapefile
has a field named 'n' that represents the grouping. How would I go about
making a map that shows my polygons grouped by 'n' in different colors?
Thanks in advance for any pointers!
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