convexHull: Convex hull

In EduardoArle/speciesRanges: Create or update species range maps based on point-records

Description

Creates a convex hull with a buffer using all the occurrence points available for a species. This convex hull is used as the basis to calculate the species range when a specialist range map is not available.

Usage

convexHull(occ_data, buffer = 0.5, realm = NULL)

Arguments

occ_data	output of function occData indicating the species occurrence
buffer	numeric, indicates the size of the buffer in km. Default is 0.5 degree.
realm	character, "terrestrial" or "marine". NULL will considere both.

Value

This function standardises the user provided georeferenced biological data to be fed into the models.

Examples

# Create a data.frame containing species names and coordinates

test_data <- data.frame(sps=rep("Equus acephalus",10),
             lon=c(-43.2,-58.4,-56,-44,-54.5,-57.4,-60.1,-68.5,-71.3,-47.5),
             lat=c(-22.9,-34.6,-34.8,-20,-25.5,-25.2,-3,-32.5,-41.1,-15.5),
             gender=rep("female",10),head_size=rep("headless individual"),
             occ=c(TRUE,TRUE,TRUE,FALSE,FALSE,TRUE,TRUE,FALSE,TRUE,TRUE))

occ_data <- occData(test_data,"sps","lon","lat","occ")

convex_hull <- convexHull(occ_data,realm = "terrestrial")

EduardoArle/speciesRanges documentation built on Feb. 2, 2022, 5:14 p.m.