calculate_gmted: Calculate elevation covariates

In amadeus: Accessing and Analyzing Large-Scale Environmental Data

Calculate elevation covariates

Description

Extract elevation values at point locations. Returns a data.frame object containing locs_id, year of release, and elevation variable. Elevation variable column name reflects the elevation statistic, spatial resolution of from, and circular buffer radius (ie. Breakline Emphasis at 7.5 arc-second resolution with 0 meter buffer: breakline_emphasis_r75_0).

Usage

calculate_gmted(
  from,
  locs,
  locs_id = NULL,
  radius = 0,
  fun = "mean",
  geom = FALSE,
  ...
)

Arguments

from	SpatRaster(1). Output from process_gmted().
locs	data.frame. character to file path, SpatVector, or sf object.
locs_id	character(1). Column within locations CSV file containing identifier for each unique coordinate location.
radius	integer(1). Circular buffer distance around site locations. (Default = 0).
fun	character(1). Function used to summarize multiple raster cells within sites location buffer (Default = mean).
geom	FALSE/"sf"/"terra".. Should the function return with geometry? Default is FALSE, options with geometry are "sf" or "terra". The coordinate reference system of the sf or SpatVector is that of from.
...	Placeholders

Value

a data.frame or SpatVector object

Author(s)

Mitchell Manware

See Also

process_gmted()

Examples

## NOTE: Example is wrapped in `\dontrun{}` as function requires a large
##       amount of data which is not included in the package.
## Not run: 
loc <- data.frame(id = "001", lon = -78.90, lat = 35.97)
calculate_gmted(
  from = gmted, # derived from process_gmted() example
  locs = loc,
  locs_id = "id",
  radius = 0,
  fun = "mean",
  geom = FALSE
)

## End(Not run)

amadeus documentation built on April 4, 2025, 12:21 a.m.