Creating density heatmaps for geographical data

'ppp' objects used by 'spatstat' have an annoying structure

<SNIP>

Annoyance is in the mind of the beholder I think.  Personally I
find the structure of ppp objects absolutely *delightful*! :-)

Also, they are simple, intuitive, easy to work with, and easy to
understand, take apart, dissect, and manipulate.  Furthermore the
tools in spatstat make it easy to do unto ppp objects pretty well
anything one might want to do to a point pattern.  (I'm not being
immodest here; the tools are mainly down to Adrian.)

Just what do you find ``annoying'' about the structure of ppp objects?

Well, I guess only the fact that they?re not ?sp? objects, really. And
that?s very annoying ? :)

And though the ?window? element of ?ppp? objects may be of use to some 
people, I haven?t had any use for it. The annoying thing here is that the 
constructor doesn?t generate the window automatically, based on the extent / 
bounding box of the data, and don?t have an *option* for doing this, either.
Whenever I have used ?spatstat? (not too often), I have had to spend too 
much time looking up how the window should be specified. Having [0,1] ? 
[0,1] as the *default* window, and excluding any points outside this does 
seems like a strange design decision.

Karl Ove Hufthammer