Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree Class Reference

A SpatialPrefixGrid based on Geohashes. Uses GeohashUtils to do all the geohash work. More...

Inherits Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree.

Classes
class	Factory
	Factory for creating GeohashPrefixTree instances with useful defaults More...
class	GhCell

Public Member Functions
	GeohashPrefixTree (SpatialContext ctx, int maxLevels)
override int	GetLevelForDistance (double dist)
	Returns the level of the largest grid in which its longest side is less than or equal to the provided distance (in degrees). Consequently dist acts as an error epsilon declaring the amount of detail needed in the grid, such that you can get a grid with just the right amount of precision.
override Node	GetNode (string token)
override Node	GetNode (byte[] bytes, int offset, int len)
override IList< Node >	GetNodes (Shape shape, int detailLevel, bool inclParents)
Public Member Functions inherited from Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree
SpatialContext	GetSpatialContext ()
int	GetMaxLevels ()
override String	ToString ()
Node	GetWorldNode ()
abstract Node	GetNode (String token)
Node	GetNode (string token, Node target)

Static Public Member Functions
static int	GetMaxLevelsPossible ()
	Any more than this and there's no point (double lat and lon are the same).
Static Public Member Functions inherited from Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree
static List< String >	NodesToTokenStrings (Collection< Node > nodes)

Protected Member Functions
override Node	GetNode (Point p, int level)
Protected Member Functions inherited from Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree
	SpatialPrefixTree (SpatialContext ctx, int maxLevels)
virtual IList< Node >	GetNodesAltPoint (Point p, int detailLevel, bool inclParents)

Additional Inherited Members
Protected Attributes inherited from Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree
readonly int	maxLevels

Detailed Description

A SpatialPrefixGrid based on Geohashes. Uses GeohashUtils to do all the geohash work.

Definition at line 29 of file GeohashPrefixTree.cs.

Constructor & Destructor Documentation

Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GeohashPrefixTree	(	SpatialContext	ctx,
		int	maxLevels
	)

Definition at line 49 of file GeohashPrefixTree.cs.

Member Function Documentation

override int Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GetLevelForDistance ( double  dist )

virtual

Returns the level of the largest grid in which its longest side is less than or equal to the provided distance (in degrees). Consequently dist acts as an error epsilon declaring the amount of detail needed in the grid, such that you can get a grid with just the right amount of precision.

Parameters

dist

>= 0

Returns

level [1 to maxLevels]

Implements Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree.

Definition at line 70 of file GeohashPrefixTree.cs.

static int Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GetMaxLevelsPossible ( )

static

Any more than this and there's no point (double lat and lon are the same).

Returns

Definition at line 65 of file GeohashPrefixTree.cs.

override Node Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GetNode ( Point  p, int  level  )

protectedvirtual

Reimplemented from Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree.

Definition at line 78 of file GeohashPrefixTree.cs.

override Node Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GetNode

(

string

token

)

Definition at line 83 of file GeohashPrefixTree.cs.

override Node Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GetNode ( byte[]  bytes, int  offset, int  len  )

virtual

Implements Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree.

Definition at line 88 of file GeohashPrefixTree.cs.

override IList<Node> Lucene.Net.Spatial.Prefix.Tree.GeohashPrefixTree.GetNodes ( Shape  shape, int  detailLevel, bool  inclParents  )

virtual

Reimplemented from Lucene.Net.Spatial.Prefix.Tree.SpatialPrefixTree.

Definition at line 93 of file GeohashPrefixTree.cs.

---

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

• contrib/Spatial/Prefix/Tree/GeohashPrefixTree.cs