st_length

Preview

Support for GEOGRAPHY values is in Public Preview. Support for GEOMETRY values is generally available.

Returns the length of the input geometry or geography value.

For the corresponding Databricks SQL function, see st_length function.

Syntax

Python

from pyspark.databricks.sql import functions as dbf

dbf.st_length(col=<col>)

Parameters

Parameter	Type	Description
col	pyspark.sql.Column or str	A Geography or Geometry value.

Notes

If the input is a geometry, Cartesian length is returned (in the unit of the input coordinates). If the input is a geography, length on the WGS84 spheroid is returned (expressed in meters).

Examples

Python

from pyspark.databricks.sql import functions as dbf
from pyspark.sql.functions.builtin import round
df = spark.createDataFrame([('LINESTRING(10 34,44 57,30 24)',)], ['wkt'])
df.select(round(dbf.st_length(dbf.st_geomfromtext('wkt')), 3).alias('result')).collect()

Output

[Row(result=76.896)]