ext_matrix: Convert extent to matrix

In traveltime: Calculate Travel Times Over Space

Convert extent to matrix

Description

This function allows get_friction_surface() to accept the argument extent as a vector, 2x2 matrix, SpatVector, or SpatRaster and extracts and converts into the annoyingly specific format necessary to download the friction surface. See details in ?get_friction_surface

Usage

ext_matrix(extent)

Arguments

extent

vector of length 4, 2x2 matrix, SpatExtent, SpatVector, or SpatRaster

Value

2x2 matrix with column names "x" and "y" and row names "min" and "max"

Examples

# vector/double
x <- c(111, 112, 0, 1)
ext_matrix(x)

# SpatExtent
y <-  terra::ext(x)
ext_matrix(y)

# SpatRaster
r <- terra::rast(extent = y)
ext_matrix(r)

# SpatVector
v <- terra::vect(y)
ext_matrix(v)

traveltime documentation built on Oct. 31, 2026, 5:06 p.m.