Aggregate Polygons in a SpatialPolygonsDataFrame object, based on a vector (new_id) of the same length of the number of polygons in the starting SpatialPolygonsDataFrame (argument .sp).
A vector defining the output Polygons objects, equal in length to the length of the polygons slot of .sp; it may be character, integer, or factor
an object of class SpatialPolygonsDataFrame
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