Thanks!
But by doing this
ltraj <- Lines(sapply(split(traj_subam[c("LONGITUDE","LATITUDE")],
traj_subam$TARGET_ID), Line))
we get
Slot "ID":
[1] NA
We are not holding the [Target_ID] column as ID ?
2010/5/25 Edzer Pebesma <edzer.pebe...@uni-muenster.de>:
> Here's an example how a Lines object is built from several sets of
> points (meuse data, split by soil type):
>
> library(sp)
> data(meuse)
> Lines(sapply(split(meuse[c("x","y")], meuse$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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>> R-sig-Geo@stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>
> --
> 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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>
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