הערה
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Important
This feature is in Public Preview.
Returns the concave hull of the input geometry as a geometry using the specified length ratio.
For the corresponding Databricks SQL function, see st_concavehull function.
Syntax
from pyspark.databricks.sql import functions as dbf
dbf.st_concavehull(col1=<col1>, col2=<col2>, col3=<col3>)
Parameters
| Parameter | Type | Description |
|---|---|---|
col1 |
pyspark.sql.Column or str |
A Geometry value. |
col2 |
pyspark.sql.Column or float |
A double value between 0 and 1, inclusive, representing the length ratio used to compute the concave hull. |
col3 |
pyspark.sql.Column or bool |
An optional boolean value, indicating whether the output geometry, if a polygon, is allowed to have holes. The default value is False. |
Examples
from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('MULTIPOINT(0 0,10 0,10 10,0 10,1 1,1 5,1 9,5 1,9 9,9 1,9 5,5 9)', 0.8)], ['wkt','ratio'])
df.select(dbf.st_astext(dbf.st_concavehull(dbf.st_geomfromtext('wkt'), 'ratio')).alias('result')).collect()
[Row(result='POLYGON((0 0,1 5,0 10,5 9,10 10,9 5,10 0,5 1,0 0))')]