character string stating either single or multiple. In the former case, each feature in one field will be matched to only one feature in the other, which will be taken to be the features who have the smallest minimum bou
mindist
single numeric giving the minimum boundary separation distance (measured by grid squares) beyond which features should not be matched.
verbose
logical, should progress information be printed to the screen?
...
Optional arguments to the distmap function from package spatstat.
Value
A list object of class matched is returned. If the type argument is multiple, then an implicite.merges component is included, which will work with the MergeForce function.
Details
the minimum boundary separation is calculated by first finding the distance map for every feature in the observed field, masking it by each feature in the forecast field, and then finding the minimum of the resulting masked distance map. If type is single, then the features are matched by the smallest minimum boundary separation per feature in each field. If type is multiple, then every feature is matched so long as their minimum boundary separation (measured in grid squares) is less than or equal to mindist.