[R-sig-Geo] Error in ContourLines2SLDF(CLrp) : cL too short

[Maxime Pauwels]

  Thanks Roger,

I finally found the solution. It was indeed in the organization of the 
input file.

Best regards

Maxime

Le 27/09/2010 17:37, Roger Bivand a écrit :
> On Mon, 27 Sep 2010, Maxime Pauwels wrote:
>
>> If you want to test the input, please find it here:
>>
>> https://bigfile.univ-lille1.fr/get?k=sgVm6qmUdiCddAJlpzh
>
> image(rangerp)
> image(imgrp)
>
> suggest that contour() will fail, as it does. Are you sure that the 
> input data are correctly organised?
>
> Roger
>
>>
>> Maxime
>>
>> Le 27/09/2010 13:34, Roger Bivand a écrit :
>>> 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]]
>>>>
>>>>
>>>
>>
>>
>>
>


-- 
Maxime Pauwels
Researcher ID: http://www.researcherid.com/rid/A-1745-2009

Laboratoire de Génétique et Evolution des Populations Végétales
FRE CNRS 3268
Université 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.»
René Char