Predicate (Snowflake)
Note
Please always keep the schema name SEDONA (e.g., SEDONA.ST_GeomFromWKT) when you use Sedona functions to avoid conflicting with Snowflake's built-in functions.
ST_Contains¶
Introduction: Return true if A fully contains B
Format: ST_Contains (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_Contains(ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0), pointdf.arealandmark)
ST_Crosses¶
Introduction: Return true if A crosses B
Format: ST_Crosses (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_Crosses(pointdf.arealandmark, ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0))
ST_Disjoint¶
Introduction: Return true if A and B are disjoint
Format: ST_Disjoint (A:geometry, B:geometry)
SQL example:
SELECT *
FROM geom
WHERE ST_Disjoinnt(geom.geom_a, geom.geom_b)
ST_DWithin¶
Introduction: Returns true if 'leftGeometry' and 'rightGeometry' are within a specified 'distance'. This function essentially checks if the shortest distance between the envelope of the two geometries is <= the provided distance.
Format: ST_DWithin (leftGeometry: Geometry, rightGeometry: Geometry, distance: Double)
SQL Example:
SELECT ST_DWithin(ST_GeomFromWKT('POINT (0 0)'), ST_GeomFromWKT('POINT (1 0)'), 2.5)
Output:
true
ST_Equals¶
Introduction: Return true if A equals to B
Format: ST_Equals (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_Equals(pointdf.arealandmark, ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0))
ST_Intersects¶
Introduction: Return true if A intersects B
Format: ST_Intersects (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_Intersects(ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0), pointdf.arealandmark)
ST_OrderingEquals¶
Introduction: Returns true if the geometries are equal and the coordinates are in the same order
Format: ST_OrderingEquals(A: geometry, B: geometry)
SQL example 1:
SELECT ST_OrderingEquals(ST_GeomFromWKT('POLYGON((2 0, 0 2, -2 0, 2 0))'), ST_GeomFromWKT('POLYGON((2 0, 0 2, -2 0, 2 0))'))
Output: true
SQL example 2:
SELECT ST_OrderingEquals(ST_GeomFromWKT('POLYGON((2 0, 0 2, -2 0, 2 0))'), ST_GeomFromWKT('POLYGON((0 2, -2 0, 2 0, 0 2))'))
Output: false
ST_Overlaps¶
Introduction: Return true if A overlaps B
Format: ST_Overlaps (A:geometry, B:geometry)
SQL example:
SELECT *
FROM geom
WHERE ST_Overlaps(geom.geom_a, geom.geom_b)
ST_Touches¶
Introduction: Return true if A touches B
Format: ST_Touches (A:geometry, B:geometry)
SELECT *
FROM pointdf
WHERE ST_Touches(pointdf.arealandmark, ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0))
ST_Within¶
Introduction: Return true if A is fully contained by B
Format: ST_Within (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_Within(pointdf.arealandmark, ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0))
ST_Covers¶
Introduction: Return true if A covers B
Format: ST_Covers (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_Covers(ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0), pointdf.arealandmark)
ST_CoveredBy¶
Introduction: Return true if A is covered by B
Format: ST_CoveredBy (A:geometry, B:geometry)
SQL example:
SELECT *
FROM pointdf
WHERE ST_CoveredBy(pointdf.arealandmark, ST_PolygonFromEnvelope(1.0,100.0,1000.0,1100.0))