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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