Error in ContourLines2SLDF(CLrp) : cL too short
On Mon, 27 Sep 2010, Maxime Pauwels wrote:
Hi list,
I have a message error using contourLines and ContourLines2SLDF
functions (maptools package).
rangerp<-read.table("NAhalleri.txt", header=T)
coordinates(rangerp)=~long+lat
gridded(rangerp)=TRUE
proj4string(rangerp)<-CRS("+proj=longlat")
imgrp<-as(rangerp,"SpatialGridDataFrame")
img1rp<-as.image.SpatialGridDataFrame(imgrp["V1"])
CLrp<-contourLines(img1rp, levels=0.0000878882)
CLSLrp<-ContourLines2SLDF(CLrp)
/Error in ContourLines2SLDF(CLrp) : cL too short/
Could anyone help understant what happens?
The levels= value is outside the range of values in img1rp: library(maptools) image(volcano) summary(c(volcano)) CLrp <- contourLines(volcano, levels=70) CLSLrp<-ContourLines2SLDF(CLrp) # error CLrp <- contourLines(volcano, levels=170) CLSLrp<-ContourLines2SLDF(CLrp) plot(CLSLrp, add=TRUE) # OK Hope this helps, Roger
Can the input table be too long (3 columns, but almost 300 000 lines)? Many thanks, Maxime Maxime Pauwels Researcher ID: http://www.researcherid.com/rid/A-1745-2009 Laboratoire de G?n?tique et Evolution des Populations V?g?tales FRE CNRS 3268 Universit? de Lille, USTL-Lille1 http://gepv.univ-lille1.fr Tel : +33 3 20 33 62 38 Fax : +33 3 20 43 69 79 ?Impose ta chance, serre ton bonheur et va vers ton risque. A te regarder, ils s'habitueront.? Ren? Char [[alternative HTML version deleted]]
Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no