Teradata Package for Python Function Reference | 20.00 - sym_difference - Teradata Package for Python - Look here for syntax, methods and examples for the functions included in the Teradata Package for Python.

Teradata® Package for Python Function Reference - 20.00

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Teradata Package for Python
Release Number
20.00
Published
March 2024
Language
English (United States)
Last Update
2024-04-10
dita:id
TeradataPython_FxRef_Enterprise_2000
Product Category
Teradata Vantage
teradataml.geospatial.geodataframecolumn.GeoDataFrameColumn.sym_difference = sym_difference(self, geom_column)
DESCRIPTION:
    Returns a Geometry value that represents the point set symmetric
    difference of two Geometry values.
 
PARAMETERS:
    geom_column:
        Required Argument.
        Specifies the other Geometry value.
        Types: str, ColumnExpression, GeometryType
 
SUPPORTED GEOMETRY TYPES:
    All Geometry types except geometry collections.
    Note:
        This method can be called on 3D geometries (those that include Z
        coordinates). However, the Z coordinate is ignored in method
        calculations. Consequently, any Z coordinates returned by this
        method should be ignored. Teradata recommends using the make_2D()
        method to strip out the Z coordinates of the return value.
 
RAISES:
    TypeError, ValueError, TeradataMlException
 
RETURNS:
    GeoDataFrameColumn
    Notes:
        Returns a Geometry type where the representation is one of the
        possible set of types in the following table, depending on the
        parameter types.
        +==============+=====+=====+==============+======+======+=======+=======+
        | u (a - b)    | Ø   | Pnt | Line, GeoSeq | Poly | MPnt | MLine | MPoly |
        +==============+=====+=====+==============+======+======+=======+=======+
        | Ø            | Ø   | R01 | R02          | R03  | R04  | R05   | R06   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        | Pnt          | R01 | R10 | R15          | R22  | R10  | R17   | R19   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        | Line, GeoSeq | R02 | R15 | R08          | R21  | R15  | R08   | R18   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        | Poly         | R03 | R22 | R21          | R14  | R22  | R21   | R14   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        | MPnt         | R04 | R10 | R15          | R22  | R10  | R17   | R19   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        | MLine        | R05 | R17 | R08          | R21  | R17  | R08   | R18   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        | MPoly        | R06 | R19 | R18          | R14  | R19  | R18   | R14   |
        +--------------+-----+-----+--------------+------+------+-------+-------+
        Where:
            Pnt, R01    = ST_Point
            Line, R02   = ST_LineString
            Poly, R03   = ST_Polygon
            MPnt, R04   = ST_MultiPoint
            MLine, R05  = ST_MultiLineString
            MPoly, R06  = ST_MultiPolygon
            GeoSeq      = GeoSequence
            R08         = Ø, ST_LineString, ST_MultiLineString
            R10         = Ø, ST_MultiPoint
            R14         = Ø, ST_Polygon, ST_MultiPolygon
            R15         = ST_LineString,
                          ST_GeomCollection of ST_Point and ST_LineString values
            R17         = ST_MultiLineString,
                          ST_GeomCollection of ST_Point and ST_LineString values
            R18         = ST_MultiPolygon,
                          ST_GeomCollection of ST_LineString and ST_Polygon values
            R19         = ST_MultiPolygon,
                          ST_GeomCollection of ST_Point and ST_Polygon values
            R21         = ST_Polygon,
                          ST_GeomCollection of ST_LineString and ST_Polygon values
            R22         = ST_Polygon,
                          ST_GeomCollection of ST_Point and ST_Polygon values
        Vantage converts GeoSequence types that are involved in the sym_difference()
        method to ST_LineString values. Therefore, sym_difference() never returns a GeoSequence
        type.
 
EXAMPLES:
    from teradataml import GeoDataFrame, load_example_data
    from teradataml import Point, LineString, Polygon, GeometryCollection
    # Load example data.
    load_example_data("geodataframe", "sample_shapes")
    # Create a GeoDataFrame.
    geodf = GeoDataFrame("sample_shapes")
    print(geodf)
 
    # Let's select only few columns from GeoDataFrame.
    points_lines = geodf.select(["skey", "points", "linestrings"])
 
    # Example 1: Get the point set symmetric difference between geometries in columns
    #            'points' and 'linestrings'.
    points_lines.assign(res = points_lines.points.intersection(geom_column=points_lines.linestrings))
 
    # Example 2: Get the point set symmetric difference between geometries in columns
    #            'linestrings' and a GeometryType object - Linestring.
    # Create an object of Linestring GeometryType.
    l1 = LineString([(1,3), (3,0), (0,1)])
    # Pass the LineString() GeometryType object as input to "geom_column" argument.
    points_lines.assign(res = points_lines.linestrings.intersection(l1))
 
    # Example 3: Filter the rows where the point set symmetric difference between geometries in columns
    #            'points' and 'linestrings' is same as the empty GeometryCollection.
    # Create an object of empty GeometryCollection GeometryType.
    gc1 = GeometryCollection()
    points_lines[points_lines.points.intersection(geom_column=points_lines.linestrings) == gc1]