R help - Apr 2010 - overlaying a levelplot on a map plot

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.

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

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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.
>
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David Winsemius, MD
West Hartford, CT