the spatial coordinates of the observations. data.frame.
array
alternative specification of the spatial coordinates using an array where the non-NA values indicates the points of interest. array or NULL leading to use the coords argument.
filter
the type of filter, see calcFilter for more details. character.
Value
A data.frame with the spatial coordinates of the outline.
Details
FUNCTION:
This function apply a filter to the spatial group and consider as the outline all the observations that do not reach the maximum value (i.e. do not have a complete neighbourhood).