R help - Feb 2008 - maps and lattice

Is it possible to place maps onto lattice plots?

With basic plotting you can add a map to a plot

library(lattice)
long<-c(-69.2, -69.5, -70.1, -70.3)
lat<-c(41, 41.5, 43.2, 42.8)
plot(long, lat)
map('state', c("massachusetts"),add=TRUE)

but is it possible with lattice?


library(lattice)
factor<-c(1,1,2,2)
xyplot(lat~long|fact)
...now what?

I have looked at panel and found through google an extravagant shape  
file export/import to R.
Is there a simpler fix?

Thank you very much for your help.

Jon

School for Marine Science and Technology
UMASS-Dartmouth


	[[alternative HTML version deleted]]

Jon Loehrke said the following on 2/5/2008 2:29 PM:
> Is it possible to place maps onto lattice plots?
> 
> With basic plotting you can add a map to a plot
> 
> library(lattice)
> long<-c(-69.2, -69.5, -70.1, -70.3)
> lat<-c(41, 41.5, 43.2, 42.8)
> plot(long, lat)
> map('state', c("massachusetts"),add=TRUE)
> 
> but is it possible with lattice?
> 
> 
> library(lattice)
> factor<-c(1,1,2,2)
> xyplot(lat~long|fact)
> ...now what?
> 
> I have looked at panel and found through google an extravagant shape  
> file export/import to R.
> Is there a simpler fix?
> 
> Thank you very much for your help.
> 
> Jon
> 
> School for Marine Science and Technology
> UMASS-Dartmouth
> 

Try this:

library(lattice)
library(maps)
long <- c(-69.2, -69.5, -70.1, -70.3)
lat <- c(41, 41.5, 43.2, 42.8)
fact <- c(1, 1, 2, 2)
xyplot(lat ~ long | fact,
        panel = function(...) {
          panel.xyplot(...)
          mp <- map("state", "massachusetts", plot =
FALSE)
          lpolygon(mp$x, mp$y)
        })

HTH,

--sundar

Hi,

I use the spplot function from the sp package, it uses lattice to make 
spatial plots. The sp-package provides spatial classes for R. See 
http://r-spatial.sourceforge.net/ for more information on the use of 
spatial data in R, http://r-spatial.sourceforge.net/gallery/ gives a 
gallery of spatial plots with the R code it was created by. For 
questions on spatial data in R the r-sig-geo mailing list is also a good 
option (https://stat.ethz.ch/mailman/listinfo/r-sig-geo).

hope this helps!

Paul

Jon Loehrke wrote:
> Is it possible to place maps onto lattice plots?
>
> With basic plotting you can add a map to a plot
>
> library(lattice)
> long<-c(-69.2, -69.5, -70.1, -70.3)
> lat<-c(41, 41.5, 43.2, 42.8)
> plot(long, lat)
> map('state', c("massachusetts"),add=TRUE)
>
> but is it possible with lattice?
>
>
> library(lattice)
> factor<-c(1,1,2,2)
> xyplot(lat~long|fact)
> ...now what?
>
> I have looked at panel and found through google an extravagant shape  
> file export/import to R.
> Is there a simpler fix?
>
> Thank you very much for your help.
>
> Jon
>
> School for Marine Science and Technology
> UMASS-Dartmouth
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>   

-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: 	+31302535773
Fax:	+31302531145
http://intamap.geo.uu.nl/~paul