add_from_raster: Adds values of a RasterLayer object to a...

In choisy/sptools: Additional Functions for Spatial* Objects

Description

Based on the extract function.

Usage

add_from_raster(sptsdf, rstr, varname = "new_data")

Arguments

sptsdf	A SpatialPointsDataFrame object.
rstr	A RasterLayer object.
varname	The name of the new variable. Defaults to "new_data".

Value

A SpatialPointsDataFrame object.

Examples

library(sp)

# download vietnam country administrative map in the internal library and in
# the working direction
vn <- sptools::gadm("vietnam", "sp", 0, intlib = TRUE, save = TRUE)

# With a SpatialPointsDataFrame
value <- spsample(vn, 100, "random")
value <- SpatialPointsDataFrame(value, data.frame(variable = 1:100))
value <- add_from_raster(value, srtmVN::getsrtm(), "elevation")

head(value@data)

# With a SpatialPoints
value <- spsample(vn, 100, "random")
value <- SpatialPoints(value, proj4string = vn@proj4string, bbox = vn@bbox)
value <- add_from_raster(value, srtmVN::getsrtm(), "elevation")

head(value@data)

choisy/sptools documentation built on Aug. 22, 2019, 12:57 p.m.