[R-sig-Geo] Extract points from SpatialLines objects along with the corresponding Lines' ID

[PONS Frederic - CEREMA/DTerMed/DREC/SRILH]

Dear

I think it is not possible because you can have one attribute for more 
than one geometry...

Best regards
*Frédéric Pons *
*Expert hydraulique sur les inondations et aléas côtiers
**DREC/Service Risques Inondations Littoraux et Hydraulique **- Tél.: 
(33)4 42 24 76 68 *
*Direction Territoriale Méditerranée
*
Centre d'études et d'expertise sur les risques, l'environnement, la 
mobilité et l'aménagement
www.cerema.fr <http://www.cerema.fr>
Le 04/12/2015 16:49, "> Bastien Tran (par Internet, dépôt 
r-sig-geo-bounces at r-project.org)" a écrit :
> Dear all,
>
> I am trying to extract the points that compose a SpatialLines object along
> with the Line's ID (provided when Lines() is called).
>
> Hoping it makes my question clearer this is what I am currently able to get
> (using the SpatialLines example):
>
>> library(sp)
>> l1 = cbind(c(1,2,3),c(3,2,2))
>> Sl1 = Line(l1)
>> S1 = Lines(list(Sl1), ID=c("a"))
>>
>> l2 = cbind(c(1,2,3),c(3,1.5,1))
>> Sl2 = Line(l2)
>> S2 = Lines(list(Sl2), ID="b")
>>
>>
>> L1 = SpatialLines(list(S1,S2))
>>
>> sapply(slot(L1, "lines"), function(x) lapply(slot(x, "Lines"),
> function(y) slot(y, "coords")))
> [[1]]
>       [,1] [,2]
> [1,]    1    3
> [2,]    2    2
> [3,]    3    2
>
> [[2]]
>       [,1] [,2]
> [1,]    1  3.0
> [2,]    2  1.5
> [3,]    3  1.0
>
> But I would rather like to obtain something like this:
>
> [[1]]
>       [,1] [,2] [,3]
> [1,] "1"  "3"  "a"
> [2,] "2"  "2"  "a"
> [3,] "3"  "2"  "a"
>
> [[2]]
>       [,1] [,2]  [,3]
> [1,] "1"  "3"   "b"
> [2,] "2"  "1.5" "b"
> [3,] "3"  "1"   "b"
>
> If possible I would like to avoid type conversions and get a data.frame
> directly though I could indeed recreate one with these matrices, without
> information loss I assume.
>
> Thank you in advance for any tips.
>
> Best regards,
> Bastien
>
> 	[[alternative HTML version deleted]]
>
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>

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