traveltime {mapme.biodiversity} | R Documentation |
Calculate accessibility statistics
Description
Accessibility is the ease with which larger cities can be reached from a certain location. This function allows to efficiently calculate accessibility statistics (i.e. travel time to nearby major cities) for polygons. For each polygon, the desired statistic/s (mean, median or sd) is/are returned.
Usage
calc_traveltime(engine = "extract", stats = "mean")
Arguments
engine |
The preferred processing functions from either one of "zonal", "extract" or "exactextract" as character. |
stats |
Function to be applied to compute statistics for polygons either single or multiple inputs as character. Supported statistics are: "mean", "median", "sd", "min", "max", "sum" "var". |
Details
The required resources for this indicator are:
Value
A function that returns an indicator tibble with city ranges and statisics as variable and corresponding values (in minutes) as value.
Examples
## Not run:
library(sf)
library(mapme.biodiversity)
outdir <- file.path(tempdir(), "mapme-data")
dir.create(outdir, showWarnings = FALSE)
mapme_options(
outdir = outdir,
verbose = FALSE
)
aoi <- system.file("extdata", "sierra_de_neiba_478140_2.gpkg",
package = "mapme.biodiversity"
) %>%
read_sf() %>%
get_resources(get_nelson_et_al(ranges = "100k_200k")) %>%
calc_indicators(
calc_traveltime(engine = "extract", stats = c("min", "max"))
) %>%
portfolio_long()
aoi
## End(Not run)