NPG: Generates points of natural origin.
In Biolinv: Modelling and Forecasting Biological Invasions

Description Usage Arguments Value Author(s)

This function generates points of natural origin around existent points by sampling their distance from the original propagule from a user-defined dispersal kernel (as set in function SDS(), the output of which is to be entered in this function as argument 'Delta'.

1	NPG(PresLoc, N, Deltas, year)

`PresLoc`	data frame with coordinates of sighting locations. Column 2 must be 'y' (latitude on a projected coordinate system with meters as distance unit of measure) and column 3 must be 'x' (longitude on a projected coordinate system with meters as distance unit of measure).
`N`	total number of points to generate.
`Deltas`	y and x shifts as generated from function SDS(). This function samples distance and angle of new points form existing ones from this argument.
`year`	the year lable to attach to the generated points