pseudo.present.points: Generation of pseudo present points for niche model building

In Yangcq-Ivy/NicheBarcoding: Niche-model-Based Species Identification

Generation of pseudo present points for niche model building

Description

Randomly generate pseudo points around actual present distribution site when the number of present points is inadequate for building a niche model.

Usage

pseudo.present.points(
  data,
  outputNum = 50,
  lonRange = 2,
  latRange = 1,
  en.vir = NULL,
  map = TRUE
)

Arguments

data	Data frame, longitude and latitude of a single species.
outputNum	Numeric, the expected number of points.
lonRange	Range of the longitude of the points generated.
latRange	Range of the latitude of the points generated.
en.vir	RasterBrick, the globle bioclimate data obtained from "raster::getData" function.
map	Logical. Should a map be drawn?

Value

A data frame, containing actual present points and simulated pseudo points.

Author(s)

Cai-qing YANG (Email: yangcq(at)cnu.edu.cn) and Ai-bing ZHANG (Email:zhangab2008(at)cnu.edu.cn), Capital Normal University (CNU), Beijing, CHINA.

Examples

data(en.vir)
#envir<-raster::getData("worldclim",download=FALSE,var="bio",res=2.5)
#en.vir<-raster::brick(envir)

data<-data.frame(species=rep("Acosmeryx anceus",3),
                 Lon=c(145.380,145.270,135.461),
                 Lat=c(-16.4800,-5.2500,-16.0810))


present.points<-pseudo.present.points(data,10,2,1,en.vir=en.vir)
present.points

Yangcq-Ivy/NicheBarcoding documentation built on Aug. 9, 2024, 9:50 p.m.