oracle.spatial.spark.vector.sql.udf.function

Class STSimplifyVW

java.lang.Object

oracle.spatial.spark.vector.sql.udf.function.STSimplifyVW

public class STSimplifyVW
extends java.lang.Object

Generates a new ST_Geometry object by simplifying the input geometry using the Visvalingham-Whyatt algorithm. Format: ST_SimplifyVW(geometry ST_Geometry, threshold NUMBER) - return a new ST_Geometry object by simplifying the input geometry using the Visvalingham-Whyatt Algorithm This method takes a threshold as the input. The threshold value to be used for the geometry simplification has to be expressed as a percentage value between 0 and 100. As the value is decreased, the returned geometry is likely to be closer to the input geometry, as the value is increased then fewer points are likely to be in the returned geometry. Example: select ST_SimplifyVW(ST_Polygon('{"type": "Polygon","coordinates": [[[1, 2], [1.01, 2.01], [5, 2], [5, 6], [1, 6], [1, 2]]]}', 0), 50) from table LIMIT 1; -- return {"type":"Polygon","coordinates":[[[1,2],[5,6],[1,6],[1,2]]],"crs":{"type":"name","properties":{"name":"EPSG:0"}}}

Constructor Summary

Constructors

Constructor and Description
STSimplifyVW()

Method Summary

Modifier and Type	Method and Description
java.lang.String	call(java.lang.String geometry, java.lang.Integer threshold) Execution call for SimplifyVW UDF

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

STSimplifyVW

public STSimplifyVW()

Method Detail

call

public java.lang.String call(java.lang.String geometry,
                             java.lang.Integer threshold)
                      throws java.lang.Exception

Execution call for SimplifyVW UDF

Parameters:

geometry - Geometry parameter

threshold - for simplification

Returns:

String the simplification for the geometry, null if there is an error

Throws:

java.lang.Exception