docstr: Returns the union of a sequence of geometries
  
  Usually used to convert a collection into the smallest set of polygons
  that cover the same area.
docstr_tok: ["Returns","the","union","of","a","sequence","of","geometries","Usually","used","to","convert","a","collection","into","the","smallest","set","of","polygons","that","cover","the","same","area","."]
code: def unary_union(self, geoms):
      """Returns the union of a sequence of geometries
  
      Usually used to convert a collection into the smallest set of polygons
      that cover the same area.
      """
      return shapely.union_all(geoms, axis=None)
  
imports: from warnings import warn
  import shapely
  from shapely.algorithms.polylabel import polylabel
  from shapely.errors import GeometryTypeError, ShapelyDeprecationWarning
  from shapely.geometry import GeometryCollection, LineString, MultiLineString, MultiPoint, Point, Polygon, shape
  from shapely.geometry.base import BaseGeometry, BaseMultipartGeometry
  from shapely.geometry.polygon import orient
  from shapely.prepared import prep
label_desc: Use image node_id 6 for calling the CollectionOperator obj's underlying member method code with example usage: obj.unary_union(geoms) and returns: shapely