interpNear: Nearest neighbor interpolation

In terra: Spatial Data Analysis

Nearest neighbor interpolation

Description

Nearest neighbor interpolation of points, using a moving window

Usage

## S4 method for signature 'SpatRaster,SpatVector'
interpNear(x, y, field, radius, interpolate=FALSE, fill=NA, filename="", ...)

## S4 method for signature 'SpatRaster,matrix'
interpNear(x, y, radius, interpolate=FALSE, fill=NA, filename="", ...)

Arguments

x	SpatRaster
y	SpatVector or matrix with three columns (x,y,z)
field	character. field name in SpatVector y
radius	numeric. The radius of the circle (single number). If interpolate=FALSE it is also possible to use two or three numbers. Two numbers are interpreted as the radii of an ellipse (x and y-axis). A third number should indicated the desired, counter clockwise, rotation of the ellipse (in degrees)
interpolate	logical. Should the nearest neighbor values be linearly interpolated between points?
fill	numeric. value to use to fill empty cells
filename	character. Output filename
...	additional arguments for writing files as in writeRaster

Value

SpatRaster

See Also

rasterizeWin, rasterize, interpIDW, interpolate

Examples

r <- rast(ncol=100, nrow=100, crs="local", xmin=0, xmax=50, ymin=0, ymax=50)
set.seed(100)
x <- runif(25, 5, 45)
y <- runif(25, 5, 45)
z <- sample(25)
xyz <- cbind(x,y,z)

x <- interpNear(r, xyz, radius=5)

p <- vect(data.frame(xyz), geom=c("x", "y")) 
v <- voronoi(p)

plot(x, col=rainbow(25))
lines(v)

# plot(v, col=rainbow(25)); points(p)

terra documentation built on Oct. 13, 2023, 5:08 p.m.