Create grid — grid_res • sporeg

This function creates a grid inside a specified polygon.

Usage

grid_res(km, study_site, epsg, what)

Arguments

km: grid cell resolution in km. one-sided length of grid cell, assumes desired grid cell is to be squared
study_site: simple feature polygon object in which grid cells should be created
epsg: epsg numeric code for desired coordinate system transformation
what: "polygons" for grid cell polygons or "centers" for center points of grid cells

Value

grid comprised of polygons or points depending on what parameter

Examples

# NOTE: The study site must be in a projected coordinate system (e.g., WGS 84; EPSG: 3857)
# when it is initially fed into the function grid_res

library(sporeg)
library(dplyr)
library(sf)
load(system.file("extdata", "site_depth.Rda", package = "sporeg"))

site_depth <- site_depth %>% sf::st_transform(., 3857)
HS_100km_grid <- grid_res(100, site_depth, 4269, "polygons")
#> Warning: attribute variables are assumed to be spatially constant throughout all geometries