transLines2pix: Convert MULTILINESTRING and/or LINESTRING into POINT geometry...

In pgirmess: Spatial Analysis and Data Mining for Field Ecologists

Convert MULTILINESTRING and/or LINESTRING into POINT geometry with points at regular distance between nodes

Description

Convert a simple feature geometry made of MULTILINESTRING and/or LINESTRING into a POINT geometry with points at regular distance between nodes

Usage

transLines2pix(spldf,mindist=100)

Arguments

spldf	A sfc object containing MULTILINESTRING or LINESTRING or both, exclusively
mindist	the distance between two points (default to 100)

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 st_thintrack complementarily is advised.

Value

A sf object with a POINT geometry type.

See Also

trans2pix, st_thintrack, mergeTrackObs

Examples

if (require(sf)) {
l1 = st_linestring(cbind(c(1,2,3),c(3,2,2)))
S1<-st_multilinestring(list(l1,cbind(l1[,1]+.05,l1[,2]+.05)))
S2<-st_linestring(cbind(c(1,2,3),c(1,1.5,1)))
sl<-st_sfc(list(S1,S2))
plot(sl, col = c("red", "blue"),reset=FALSE)

trpt<-transLines2pix(sl,mindist=0.1)

plot(st_geometry(trpt),add=TRUE)
}

pgirmess documentation built on May 29, 2024, 4:26 a.m.