Just a doubt... there seems that the contours are not shifted but
"mirrored" (flipped) along an horizontal line?
Virgilio Gomez Rubio escribió:
Hi,
El lun, 19-01-2009 a las 18:37 +0100, Maxime Pauwels escribió:
Dear Virgilio,
I think you're right. Unfortunately, I am not familiar enough with the
analysis of spatial data to avoid such conflict.
Do you know wath function I should use to generate contour before
conversion.
This example may help:
library(maptools)
res <- ContourLines2SLDF(contourLines(volcano))
grd<-GridTopology(c(0,0), 1/dim(volcano), dim(volcano))
spvolcano<-SpatialGridDataFrame(grd,
data.frame(altitude=as.vector(volcano)))
spplot(spvolcano, sp.layout=list(list("sp.lines", res)) )
There is something wrong in the way I have defined the grid topology and
the contour lines are shifted north, but you will get the idea. You
could also add labels to the contour lines.
Best,
Virgilio
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