ST_PolyFromText takes a string column and returns a polygon column.
The string column must contain the well-known text (WKT)
representation of polygon geometries.
You can optionally specify a spatial reference ID for the result polygon column.
The sr parameter value must be a valid SRID or WKT string.
| Function | Syntax |
|---|---|
| Python | poly |
| SQL | ST |
| Scala | poly |
For more details, go to the GeoAnalytics Engine API reference for poly_from_text.
This function implements the OpenGIS Simple Features Implementation Specification for SQL 1.2.1.
Examples
from geoanalytics.sql import functions as ST
polygon_text = 'POLYGON ((-117.271 34.059, -117.225 33.919, -116.963 33.662, -116.668 33.712))'
df = spark.createDataFrame([(polygon_text,)], ["wkt"])
df.select(ST.poly_from_text("wkt", srid=4326).alias("poly_from_text")).show(truncate=False)Result
+-------------------------------------------------------------------------------------------------------+
|poly_from_text |
+-------------------------------------------------------------------------------------------------------+
|{"rings":[[[-117.271,34.059],[-116.668,33.712],[-116.963,33.662],[-117.225,33.919],[-117.271,34.059]]]}|
+-------------------------------------------------------------------------------------------------------+Version table
| Release | Notes |
|---|---|
1.0.0 | Python and SQL functions introduced |
1.5.0 | Scala function introduced |