pseudo.absence: sample background aka pseudo-absence data
In janhoo/crecs: quantitative species distribution modelling

Description Usage Arguments Details Value Examples

View source: R/func.dataset.R

takes SpatialPoints or SpatialPointsDataFrame and add values from FIXME

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pseudo.absence(presence, raster, area = NULL, sample.size = 1000,
  extent = "raster", buffer = NULL, chunks = NULL, verbose = TRUE,
  seed = NULL, xtracols = NULL, out = "spdf", colname = NULL)

`presence`	`SpatialPoints` of presence data
`raster`	`RasterLayer` is required for sampling. If `buffer=NULL`, the background is sampled without the pixels with presence data.
`area`	`SpatialPolygons` or `SpatialPolygonsDataFrame` with an area within `raster` to be sampled (cmp. `extent`)
`sample.size`	The sample size
`extent`	Eiter `raster(default), extent, or area`. Sample the whole area (extent), only where raster vals are !=NA (rater) or confined to an area (area).
`buffer`	Perimeter around presence data where background is not sampled. Distance unit of buffer: see `raster::buffer`.
`verbose`	Be verbose
`seed`	Seed for random background sampling
`xtracols`	transfer given features from `presence`–input data `SpatialPointsDataFrame` to returned `SpatialPointsDataFrame`.
`out`	If `spdf`(default), a SpatialPointDataFrame is returned with a column "presence" with 1:presence 0:absence. If `sp`, only the `SpatialPoints` of the background are returned. Overrides `xtracols`
`colname`	New colnames for `xtracols`. `length(colname)==length(xtracols)`.