Visual detection of outliers.
Draws plots of sites in geographical (latlong) and environmental (2-axis PCA) space.
Matrix of longitude and latitude (two columns) of species occurrence records.
Raster* object as defined by package raster. It can be any set of environmental layers thought to allow the identification of environmental outliers.
Erroneous data sources or errors in transcriptions may introduce outliers that can be easily detected by looking at simple graphs of geographical or environmental space.
No values are returned, two plots are drawn for visual inspection.