geos::index::strtree::SimpleSTRtree Class Reference

A query-only R-tree created using the Sort-Tile-Recursive (STR) algorithm. For two-dimensional spatial data. More...

#include <SimpleSTRtree.h>

Inheritance diagram for geos::index::strtree::SimpleSTRtree:

Public Member Functions
	SimpleSTRtree (std::size_t capacity=10)
std::size_t	getNodeCapacity () const
std::size_t	getNumLeafNodes () const
bool	getBuilt () const
SimpleSTRnode *	getRoot ()
void	insert (geom::Geometry *geom)
void	insert (const geom::Envelope *itemEnv, void *item) override
	Adds a spatial item with an extent specified by the given Envelope to the index.
void	iterate (ItemVisitor &visitor)
void	query (const geom::Envelope *searchEnv, std::vector< void * > &matches) override
	Queries the index for all items whose extents intersect the given search Envelope.
void	query (const geom::Envelope *searchEnv, ItemVisitor &visitor) override
	Queries the index for all items whose extents intersect the given search Envelope and applies an ItemVisitor to them.
bool	remove (const geom::Envelope *searchBounds, void *item) override
	Removes a single item from the tree.
std::pair< const void *, const void * >	nearestNeighbour (ItemDistance *itemDist)
const void *	nearestNeighbour (const geom::Envelope *env, const void *item, ItemDistance *itemDist)
std::pair< const void *, const void * >	nearestNeighbour (SimpleSTRtree &tree, ItemDistance *itemDist)
bool	isWithinDistance (SimpleSTRtree &tree, ItemDistance *itemDist, double maxDistance)

Public Attributes
SimpleSTRnode *	root

Friends
std::ostream &	operator<< (std::ostream &os, const SimpleSTRtree &tree)

Detailed Description

A query-only R-tree created using the Sort-Tile-Recursive (STR) algorithm. For two-dimensional spatial data.

The STR packed R-tree is simple to implement and maximizes space utilization; that is, as many leaves as possible are filled to capacity. Overlap between nodes is far less than in a basic R-tree. However, once the tree has been built (explicitly or on the first call to query), items may not be added or removed.

Described in: P. Rigaux, Michel Scholl and Agnes Voisard. Spatial Databases With Application To GIS. Morgan Kaufmann, San Francisco, 2002.

Constructor & Destructor Documentation

SimpleSTRtree()

geos::index::strtree::SimpleSTRtree::SimpleSTRtree ( std::size_t  capacity = 10 )

inline

Constructs an STRtree with the given maximum number of child nodes that a node may have

Member Function Documentation

insert()

void geos::index::strtree::SimpleSTRtree::insert ( const geom::Envelope *  itemEnv, void *  item  )

overridevirtual

Adds a spatial item with an extent specified by the given Envelope to the index.

Parameters

itemEnv	Envelope of the item, ownership left to caller. TODO: Reference hold by this class ?
item	Opaque item, ownership left to caller. Reference hold by this class.

Implements geos::index::SpatialIndex.

query() [1/2]

void geos::index::strtree::SimpleSTRtree::query ( const geom::Envelope *  searchEnv, ItemVisitor &  visitor  )

overridevirtual

Queries the index for all items whose extents intersect the given search Envelope and applies an ItemVisitor to them.

Note that some kinds of indexes may also return objects which do not in fact intersect the query envelope.

Parameters

searchEnv	the envelope to query for
visitor	a visitor object to apply to the items found

Implements geos::index::SpatialIndex.

query() [2/2]

void geos::index::strtree::SimpleSTRtree::query ( const geom::Envelope *  searchEnv, std::vector< void * > &    )

overridevirtual

Queries the index for all items whose extents intersect the given search Envelope.

Note that some kinds of indexes may also return objects which do not in fact intersect the query envelope.

Parameters

searchEnv

the envelope to query for

Implements geos::index::SpatialIndex.

remove()

bool geos::index::strtree::SimpleSTRtree::remove ( const geom::Envelope *  itemEnv, void *  item  )

overridevirtual

Removes a single item from the tree.

Parameters

itemEnv	the Envelope of the item to remove
item	the item to remove

Returns

true if the item was found

Implements geos::index::SpatialIndex.

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The documentation for this class was generated from the following file:

• SimpleSTRtree.h