red (version 1.6.1)

elevation: Elevation limits.

Description

Calculates the elevation (or depth) limits (range) of a species based on either known records or predicted distribution.

Usage

elevation(spData, dem = NULL)

Value

A vector with two values (min and max) in meters above (or below) sea level.

Arguments

spData

One of three options: 1) matrix of longitude and latitude (two columns) of each occurrence record; 2) matrix of easting and northing (two columns, e.g. UTM) of each occurrence record in meters; 3) RasterLayer object of predicted distribution (0/1 values).

dem

RasterLayer object. Should be a digital elevation model (DEM) of the relevant area. If not given the function will try to read it from base data, only works with longlat data.

Details

Maximum and minimum elevation are calculated based on the DEM.

Examples

records = red.examples("red.records")
range = red.examples("red.range")
layers = red.examples("red.layers")
dem = layers[[3]]
elevation(records, dem)
elevation(range, dem)