ST_InteriorRingN

ST_InteriorRingN
Input polygon and the resulting interior ring.

ST_InteriorRingN takes a polygon column and a numeric value (n) and returns a linestring column. The output is the nth interior ring of the input polygon as a linestring. If there is more than one interior ring, the order of the interior rings is defined by the order in the input polygon. When n=0, the first interior ring is returned. If the index exceeds the number of interior rings in the polygon, null is returned. If the input is a multipolygon null is returned.

FunctionSyntax
Pythoninterior_ring_n(polygon, n)
SQLST_InteriorRingN(polygon, n)
ScalainteriorRingN(polygon, n)

For more details, go to the GeoAnalytics for Microsoft Fabric API reference for interior_ring_n.

This function implements the OpenGIS Simple Features Implementation Specification for SQL 1.2.1.

Examples

PythonPythonSQLScala
1
2
3
4
5
6
7
8
9
10
11

from geoanalytics_fabric.sql import functions as ST, Polygon

data =[("POLYGON ((10 10, 40 10, 40 40, 10 40, 10 10),"+\
        "(15 15, 20 15, 20 30, 15 30, 15 15), (30 15, 35 15, 35 30, 30 30, 30 15))",),
       ("POLYGON ((20 0, 30 20, 40 0, 20 0))",)]

df = spark.createDataFrame(data, ["wkt"]) \
    .withColumn("polygon", ST.poly_from_text("wkt"))

df.select(ST.interior_ring_n("polygon", 1).alias("interior_ring_n")).show(truncate=False)
Result
1
2
3
4
5
6
+-----------------------------------------------------+
|interior_ring_n                                      |
+-----------------------------------------------------+
|{"paths":[[[30,15],[30,30],[35,30],[35,15],[30,15]]]}|
|NULL                                                 |
+-----------------------------------------------------+

Version table

ReleaseNotes

1.0.0-beta

Python, SQL, and Scala functions introduced

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.

You can no longer sign into this site. Go to your ArcGIS portal or the ArcGIS Location Platform dashboard to perform management tasks.

Your ArcGIS portal

Create, manage, and access API keys and OAuth 2.0 developer credentials, hosted layers, and data services.

Your ArcGIS Location Platform dashboard

Manage billing, monitor service usage, and access additional resources.

Learn more about these changes in the What's new in Esri Developers June 2024 blog post.

Close