[R] overlaying a levelplot on a map plot

[David Winsemius]

On Apr 21, 2010, at 2:27 PM, Simon Goodman wrote:

>
> I've generated a levelplot showing the density distribution of a  
> species
> derived from survey transects, with lon, lat co-ordinates.
>
> I'd like to overlay this on a map of the study region specified by:
>
> map('worldHires', xlim = range(mlon), ylim = range(mlat)), where  
> mlon, mlat
> specifies the study region.

 > ?map
No documentation for 'map' in specified packages and libraries:
you could try '??map'
 > ??map
 > require(maps)
Loading required package: maps
 > map

So map uses base graphics.


> I've tried plotting the map first, then using the options: 'add=TRUE,
> axes=FALSE' in the levelplot,


levelplot is a lattice function. You will have failure with most  
efforts to mix base and grid graphics.




> but this doesn't work - a new plot is
> generated for the level plot despite the 'add' option. If I try to  
> add the
> map on top of the level plot, they are not to the same scale.
>
> Any suggestions on how to get round this.
>
> Thanks
>
> -- 
> View this message in context: http://n4.nabble.com/overlaying-a-levelplot-on-a-map-plot-tp2019419p2019419.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.

David Winsemius, MD
West Hartford, CT