interpNear function

Nearest neighbor interpolation

Nearest neighbor interpolation of points, using a moving window methods

## 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

See Also

rasterizeWin, rasterize, interpIDW, interpolate

Returns

SpatRaster

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)