[R-sig-Geo] SpatialPointDataFrame to SpatialLinesDataFrame

[Paulo Eduardo Cardoso]

When I try to coerce Lnes to SLDF with

ltraj <- Lines(sapply(split(traj_subam[c("LONGITUDE","LATITUDE")],
traj_subam$TARGET_ID), Line))
ltraj <- SpatialLinesDataFrame(ltraj, traj_subam, match.ID = TRUE)

I get

Error in slot(sl, "lines") :
  no slot of name "lines" for this object of class "Lines"

Any idea?

2010/5/26 Paulo Eduardo Cardoso <paulo.mailing.list at gmail.com>:
> Thanks!
>
> But by doing this
>
> ltraj <- Lines(sapply(split(traj_subam[c("LONGITUDE","LATITUDE")],
> traj_subam$TARGET_ID), Line))
>
> we get
>
> Slot "ID":
> [1] NA
>
>
> We are not holding the [Target_ID] column as ID ?
>
> 2010/5/25 Edzer Pebesma <edzer.pebesma at uni-muenster.de>:
>> Here's an example how a Lines object is built from several sets of
>> points (meuse data, split by soil type):
>>
>> library(sp)
>> data(meuse)
>> Lines(sapply(split(meuse[c("x","y")], meuse$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
>>>
>>> _______________________________________________
>>> R-sig-Geo mailing list
>>> R-sig-Geo at 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.pebesma at wwu.de
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>