pgirmess (version 1.6.9)

transLines2pix: Convert a SpatialLines or a SpatialLinesDataFrame object into SpatialPointsDataFrame with spatial points at regular distance along the lines

Description

Convert a SpatialLines or a SpatialLinesDataFrame object into SptaialPointsDataFrame with spatial points at regular distance along the lines

Usage

transLines2pix(spldf,mindist=100)

Arguments

spldf

A SpatialLines or a SpatialLinesDataFrame

mindist

the distance between two points (default to 100)

Value

A SpatialPointsDataFrame

Details

This function can be used e.g to discretize track lines (roads, paths, transects, etc.) into series of regular points. Each point is the centre of one interval. Beware that if mindist is larger than the distance between nodes, the output file will keep the nodes. Furthermore, mindist might not be fully respected in some spatial configurations. In such cases to filter points using thintrack complementarily is advised.

See Also

trans2pix, thintrack, mergeTrackObs

Examples

# NOT RUN {
# from the sp vignette:
     library(sp)
     l1 = cbind(c(1,2,3),c(3,2,2))
     l1a = cbind(l1[,1]+.05,l1[,2]+.05)
     l2 = cbind(c(1,2,3),c(1,1.5,1))
     Sl1 = Line(l1)
     Sl1a = Line(l1a)
     Sl2 = Line(l2)
     S1 = Lines(list(Sl1, Sl1a), ID="a")
     S2 = Lines(list(Sl2), ID="b")
     Sl = SpatialLines(list(S1,S2))
     plot(Sl, col = c("red", "blue"))
     
     trpt<-transLines2pix(Sl,mindist=0.1)
     plot(trpt,add=TRUE)
# }