extractAlong {terra}

extract values along lines

Description

Extract raster values along a line. That is, the returned values are ordered along the line. That is not the case with extract

Usage

extractAlong(x, y, ID=TRUE, cells=FALSE, xy=FALSE, online=FALSE, bilinear=TRUE)

Arguments

x

SpatRaster

y

SpatVector with lines geometry

ID

logical. Should an ID column be added? If so, the first column returned has the IDs (record numbers) of input SpatVector y

cells

logical. If TRUE the cell numbers are also returned

xy

logical. If TRUE the coordinates of the cells traversed by y are also returned. See xyFromCell

online

logical. If TRUE the returned coordinates are snapped to y

bilinear

logical. If TRUE the returned raster values computed with bilinear interpolation from the nearest four cells. Only relevant if online=TRUE

Value

data.frame

See Also

extract

Examples

r <- rast(ncols=36, nrows=18, vals=1:(18*36))
cds1 <- rbind(c(-50,0), c(0,60), c(40,5), c(15,-45), c(-10,-25))
cds2 <- rbind(c(80,20), c(140,60), c(160,0), c(140,-55))
lines <- vect(list(cds1, cds2), "lines")

extractAlong(r, lines)