Try using contour() instead of levelplot. See the examples
in help('contour') for how to add contour lines to an
existing plot.
-Peter Ehlers
On 2010-04-21 13:08, David Winsemius wrote:
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
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide
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and provide commented, minimal, self-contained, reproducible code.
--
Peter Ehlers
University of Calgary
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
