Lee, I share your confusion. Maybe something like a cheatsheet could help ?
It's not highly structured, but it present information in a different way.
These are two I'm aware of (I've made the last one).

http://www.maths.lancs.ac.uk/~rowlings/Teaching/UseR2012/cheatsheet.html
or
http://www.rpubs.com/etiennebr/visualraster

Etienne


2013/12/13 <ldecola@comcast.net>

>
>
>
> I’ve been teaching and using R (and S-PLUS) for a couple of decades, and
> using its spatial libraries for about half of that, but i still get
> confused by the various ‘geographically-aware’ data objects that are
> supported. Although Bivand’s Spatial.html page is quite helpful, I wonder
> is there a ‘bestiary’ that outlines (perhaps in some kind of tree format?)
> what they are, what geometries are represented, which libraries create or
> support them, etc.?
>
> Lee De Cola, PhD, MCP.
> DATA to Insight
> LDECOLA@COMCAST.NET
> Reston, Virginia
> 703 709 6972
> 571 315 0577 mobile
>
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