convex_richness: Convex Richness

In simon-tarr/island: Makes handling topographically complex geographical data a little less frustrating.

Description

It creates a convex hull around observation records and sets the area inside as '1' (species is present)#' It will then find the nearest non-NA cell and extend the raster so that no observation records sit on NA pixels. It sets all areas outside of the convex hull as '0' (species absent). The resulting raster images can be subsequently stacked and summed.

Usage

convex_richness(raster, observation.points)

Arguments

raster	Raster which will be extended
xy	xy coordinates specifying cell centroids. Ensure that column headings are lower case and labelled as longitude/latitude or lat/long or xy.
output.table	Logical. If output.table=TRUE then a data.frame will be displayed instead of a raster. If output.table=FALSE then an extended raster will be displayed. Default is output.table=FALSE
fact	Integer. This argument disaggregates raster* (i.e. increases the reshighres.split<-split.raster(raster=global_climate[[1]], ppside = 10, save = TRUE, plot=FALSE, raster.name="highres_split_")
only.na	Logical. If TRUE, the function will only calculate new values for NA cells. When TRUE, processing time is greatly reduced.

Examples

Coming soon.

simon-tarr/island documentation built on May 6, 2019, 8:05 p.m.