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.pebe...@wwu.de
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