extract.raster: Extracting values from raster(s) at point locations

In sitscholl/rebecka_package: Utility functions used in the REBECKA project

Description

This function allows you to extract the values of one or many rasters at the location of given points.

Usage

## S3 method for class 'raster'
extract(
  rasters,
  shp,
  id.vars,
  value.name = "value",
  variable.name = "variable",
  ...
)

Arguments

rasters	An object of class RasterLayer, RasterStack or RasterBrick. Can also be a path to a raster file or multiple paths. In the last case the corresponding files will be opened in a stack.
shp	A SpatialPointsDataFrame with the location of the points where the values should be extracted.
id.vars	A vector with the column names of 'shp' that should be in the resulting data.frame
value.name	Name of the column that stores the extracted values. Defaults to 'value'.
variable.name	Nae of the column that stores the names of the input rasters. Defaults to 'variable'.

Value

A data.frame with the first column corresponding to the first column in 'shp' and two columns that contain the names of the given rasters and the extracted values, respectively.

Examples

extract.raster(rasters = data/dem_st.tif,
  shp = station_sp,
  id.vars = c('st_id', 'st_group'),
  value.name = value
  variable.name = variable)

sitscholl/rebecka_package documentation built on Aug. 25, 2020, 4:20 a.m.