[R-sig-Geo] SpatialPointDataFrame to SpatialLinesDataFrame

[Edzer Pebesma]

Here's an example how a Lines object is built from several sets of
points (meuse data, split by soil type):

library(sp)
data(meuse)
Lines(sapply(split(meuse[c("x","y")], meuse$soil), Line))

Note that meuse is used as a data.frame in this example; use
as.data.frame on your SPDF to get it.

I hope this helps,

On 05/25/2010 04:16 PM, Paulo Eduardo Cardoso wrote:
> Hi,
> 
> How can one coerce spatial point to spatial line?
> 
> I'm struggling to find a way of coerce a point SPDF object to Lines
> based in a ID [TARGET_ID] field.
> 
> Any idea will be very welcome.
> 
> Formal class 'SpatialPointsDataFrame' [package "sp"] with 5 slots
>   ..@ data       :'data.frame': 28 obs. of  8 variables:
>   .. ..$ ID        : int [1:28] 462964 462990 463015 463034 463052 463069
> 463083 463102 463122 463144 ...
>   .. ..$ TIME_STAMP: POSIXlt[1:28], format: "2009-07-26 09:00:07"
> "2009-07-26 09:00:13" "2009-07-26 09:00:19" "2009-07-26 09:00:25" ...
>   .. ..$ DAY_PERIOD: int [1:28] 1 1 1 1 1 1 1 1 1 1 ...
>   .. ..$ SEASON    : int [1:28] 2 2 2 2 2 2 2 2 2 2 ...
>   .. ..$ TARGET_ID : int [1:28] 108426 108426 108426 108426 108426 108426
> 108426 108426 108426 108426 ...
>   .. ..$ SPEED     : num [1:28] 0.283 0.6 0.4 0.2 0.2 ...
>   .. ..$ HEADING   : int [1:28] 134 1 179 179 179 271 123 179 179 90 ...
>   .. ..$ DISTANCE  : num [1:28] 1.41 3 2 1 1 ...
>   ..@ coords.nrs : int [1:2] 7 6
>   ..@ coords     : num [1:28, 1:2] -8.71 -8.71 -8.71 -8.71 -8.71 ...
>   .. ..- attr(*, "dimnames")=List of 2
>   .. .. ..$ : NULL
>   .. .. ..$ : chr [1:2] "LONGITUDE" "LATITUDE"
>   ..@ bbox       : num [1:2, 1:2] -8.82 38.73 -8.69 38.8
>   .. ..- attr(*, "dimnames")=List of 2
>   .. .. ..$ : chr [1:2] "LONGITUDE" "LATITUDE"
>   .. .. ..$ : chr [1:2] "min" "max"
>   ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots
>   .. .. ..@ projargs: chr " +init=epsg:4326 +proj=longlat +ellps=WGS84
> +datum=WGS84 +no_defs +towgs84=0,0,0"
> 
> 
> Paulo Eduardo Cardoso
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de