Teradata Package for Python Function Reference | 20.00 - spheroidal_distance - 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
- 20.00.00.03
- Published
- December 2024
- ft:locale
- en-US
- ft:lastEdition
- 2024-12-19
- dita:id
- TeradataPython_FxRef_Enterprise_2000
- Product Category
- Teradata Vantage
- teradataml.geospatial.geodataframe.GeoDataFrame.spheroidal_distance = spheroidal_distance(self, geom_column, semimajor=6378137.0, invflattening=298.257223563)
- DESCRIPTION:
Returns the distance, in meters, between two spherical coordinates.
Notes:
* For the distance calculation, the planet is modeled as a spheroid.
* If you do not pass in values for the "semimajor" and "invflattening"
arguments, the computation uses the semimajor axis and the inverse
flattening ratio from the World Geodetic System, WGS84. A value of
6,378,137.0 meters is used for the semimajor axis, and a value of
298.257223563 is used for the inverse flattening ratio.
* Distance calculations between antipodal or nearly antipodal points
using the spheroidal_distance() method may fail to converge,
generating a Vantage error. For these distance
calculations use instead the spherical_distance() method.
PARAMETERS:
geom_column:
Required Argument.
Specifies a Geometry for the other coordinate.
Types: str, ColumnExpression, GeometryType
semimajor:
Optional Argument.
Specifies the length in meters of the semimajor axis of the
spheroid.
Default Value: 6378137.0
Types: float, int
invflattening:
Optional Argument.
Specifies the inverse flattening ratio of the spheroid.
Default Value: 298.257223563
Types: float, int
SUPPORTED GEOMETRY TYPES:
ST_Point
RAISES:
TypeError, ValueError, TeradataMlException
RETURNS:
GeoDataFrame
EXAMPLES:
from teradataml import GeoDataFrame, load_example_data
from teradataml import Point, LineString, Polygon
# 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 = geodf.select(["skey", "points"])[geodf.skey.isin([1001, 1002, 1003])]
points = points.join(points, how="cross", lsuffix="l", rsuffix="r")
# Example 1: Get the spheroidal distance between two points from columns 'l_points' and 'r_points'.
points.spheroidal_distance(points.r_points)
# Example 2: Get the spheroidal distance between points from column 'l_points' and
# a GeometryType object Point.
# Create an object of Point GeometryType.
p1 = Point(1,3)
# Pass the Point() GeometryType object as input to "geom_column" argument.
points.spheroidal_distance(geom_column=p1, semimajor=637813, invflattening=298)