Teradata Package for Python Function Reference | 20.00 - speed - 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.speed = speed(self, index=None, begin_index=None, end_index=None)
- DESCRIPTION:
Returns the approximate speed at a specified point (speed(index
INTEGER)) or between two points (speed(iBegin INTEGER, iEnd INTEGER))
for a GeoSequence type.
Notes:
* If "begin_index" and "end_index" arguments are passed, then
the speed is calculated as the distance between the two points
(along the LineString) divided by the time between them.
* If "index" is passed, then if the point is:
* The first point, the distance between the first and second
points is divided by the time between them.
* The last point, the distance between the second to the last
and last points is divided by the time between them.
* Any other point, the distance between the previous point
and the next point (along the LineString) is divided by the
time difference between the previous point and the next point.
* The units used for distance are the same units that are used by
the coordinate system for the GeoSequence value, and the time
units are in hours.
PARAMETERS:
index:
Optional Argument.
Specifies the index of the point within the GeoSequence type,
where the index of the first point is 1.
Default Value: None
Types: int, str, ColumnExpression
begin_index:
Optional Argument.
Specifies the index of the starting point for which to
calculate the speed, where the index of the first point in a
GeoSequence type is 1.
Default Value: None
Types: int, str, ColumnExpression
end_index:
Optional Argument.
Specifies the index of the ending point for which to calculate
the speed, where the index of the first point in a GeoSequence is 1.
Default Value: None
Types: int, str, ColumnExpression
SUPPORTED GEOMETRY TYPES:
GeoSequence
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.
geoseq = geodf.select(["skey", "geosequence"])[geodf.skey.isin([1001, 1002])]
# Example 1: Get the approximate speed at a point specified at 1st index for Geosequence geometries.
geoseq.speed(index=1)
# Example 2: Get the approximate speed between points at 1st and 2nd index for Geosequence geometries.
geoseq.speed(begin_index=1, end_index=2)