Aggregate anchorages into clusters
anchoragesANY Object of class poins2Matrix
deltaRnumeric Number of cells that must be traversed to cover 4 km in latitude
nnnumeric Number of valid anchorages
groupIDMatrix Sparse matrix indicating the cluster ID for each anchorage
rIdxnumeric Row indices (in groupID) of valid anchorages
cIdxnumeric Column indices (in groupID) of valid anchorages
nClustnumeric Number of clusters found
earthGeoANY Object of class earthGeoClass
verboseOutput progress to console
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