Package org.apache.sedona.core.spatialPartitioning

Class FlatGridPartitioner

java.lang.Object

org.apache.spark.Partitioner

org.apache.sedona.core.spatialPartitioning.SpatialPartitioner

org.apache.sedona.core.spatialPartitioning.FlatGridPartitioner

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

IndexedGridPartitioner

public class FlatGridPartitioner
extends SpatialPartitioner

The FlatGridPartitioner is used when there is already a set of grids which the data should be partitioned into. It iterates through all the grids to find the grids to place a geometry into. Unless you have very few objects to place, it may make more sense to use the IndexedGridPartitioner. If you do not have a strict requirement to use a specific set of grids, it may make more sense to use another partitioner that generates its own grids from a space-partitioning tree, e.g. the KDBTreePartitioner or the QuadTreePartitioner.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected final Boolean	preserveUncontainedGeometries

Fields inherited from class org.apache.sedona.core.spatialPartitioning.SpatialPartitioner

grids, gridType

Constructor Summary

Constructors

Constructor	Description
FlatGridPartitioner(List<org.locationtech.jts.geom.Envelope> grids)
FlatGridPartitioner(List<org.locationtech.jts.geom.Envelope> grids, Boolean preserveUncontainedGeometries)
FlatGridPartitioner(GridType gridType, List<org.locationtech.jts.geom.Envelope> grids)
FlatGridPartitioner(GridType gridType, List<org.locationtech.jts.geom.Envelope> grids, Boolean preserveUncontainedGeometries)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
DedupParams	getDedupParams()
int	numPartitions()
Iterator<scala.Tuple2<Integer,org.locationtech.jts.geom.Geometry>>	placeObject(org.locationtech.jts.geom.Geometry spatialObject)	Given a geometry, returns a list of partitions it overlaps.

Methods inherited from class org.apache.sedona.core.spatialPartitioning.SpatialPartitioner

getGrids, getGridType, getPartition

Methods inherited from class org.apache.spark.Partitioner

defaultPartitioner

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

preserveUncontainedGeometries

protected final Boolean preserveUncontainedGeometries

Constructor Details

FlatGridPartitioner

public FlatGridPartitioner(GridType gridType,
 List<org.locationtech.jts.geom.Envelope> grids,
 Boolean preserveUncontainedGeometries)

FlatGridPartitioner

public FlatGridPartitioner(GridType gridType,
 List<org.locationtech.jts.geom.Envelope> grids)

FlatGridPartitioner

public FlatGridPartitioner(List<org.locationtech.jts.geom.Envelope> grids,
 Boolean preserveUncontainedGeometries)

FlatGridPartitioner

public FlatGridPartitioner(List<org.locationtech.jts.geom.Envelope> grids)

Method Details

placeObject

public Iterator<scala.Tuple2<Integer,org.locationtech.jts.geom.Geometry>> placeObject(org.locationtech.jts.geom.Geometry spatialObject)
                                                                               throws Exception

Description copied from class: SpatialPartitioner

Given a geometry, returns a list of partitions it overlaps.

For points, returns exactly one partition as long as grid type is non-overlapping. For other geometry types or for overlapping grid types, may return multiple partitions.

Specified by:

placeObject in class SpatialPartitioner

Throws:

Exception

getDedupParams

@Nullable
public DedupParams getDedupParams()

Specified by:

getDedupParams in class SpatialPartitioner

numPartitions

public int numPartitions()

Specified by:

numPartitions in class org.apache.spark.Partitioner

equals

public boolean equals(Object o)

Overrides:

equals in class Object