public class GeohashPrefixTree extends SpatialPrefixTree
| Modifier and Type | Class and Description |
|---|---|
static class |
GeohashPrefixTree.Factory
Factory for creating
GeohashPrefixTree instances with useful defaults |
ctx, maxLevels| Constructor and Description |
|---|
GeohashPrefixTree(org.locationtech.spatial4j.context.SpatialContext ctx,
int maxLevels) |
| Modifier and Type | Method and Description |
|---|---|
protected Cell |
getCell(org.locationtech.spatial4j.shape.Point p,
int level)
Returns the cell containing point
p at the specified level. |
double |
getDistanceForLevel(int level)
Given a cell having the specified level, returns the distance from opposite
corners.
|
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).
|
static int |
getMaxLevelsPossible()
Any more than this and there's no point (double lat and lon are the same).
|
CellIterator |
getTreeCellIterator(org.locationtech.spatial4j.shape.Shape shape,
int detailLevel)
Gets the intersecting cells for the specified shape, without exceeding
detail level.
|
Cell |
getWorldCell()
Returns the level 0 cell which encompasses all spatial data.
|
Cell |
readCell(BytesRef term,
Cell scratch)
This creates a new Cell (or re-using
scratch if provided), initialized to the state as read
by the bytes. |
getMaxLevels, getSpatialContext, toStringpublic GeohashPrefixTree(org.locationtech.spatial4j.context.SpatialContext ctx,
int maxLevels)
public static int getMaxLevelsPossible()
public Cell getWorldCell()
SpatialPrefixTreeSpatialPrefixTree.readCell(BytesRef,Cell)
with no bytes.getWorldCell in class SpatialPrefixTreepublic int getLevelForDistance(double dist)
SpatialPrefixTreedist 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.getLevelForDistance in class SpatialPrefixTreedist - >= 0protected Cell getCell(org.locationtech.spatial4j.shape.Point p, int level)
p at the specified level.public double getDistanceForLevel(int level)
SpatialPrefixTreegetDistanceForLevel in class SpatialPrefixTreelevel - [1 to maxLevels]> 0public Cell readCell(BytesRef term, Cell scratch)
SpatialPrefixTreescratch if provided), initialized to the state as read
by the bytes.
Warning: An implementation may refer to the same byte array (no copy). If Cell.setLeaf() is
subsequently called, it would then modify these bytes.readCell in class SpatialPrefixTreepublic CellIterator getTreeCellIterator(org.locationtech.spatial4j.shape.Shape shape, int detailLevel)
SpatialPrefixTreeIMPORTANT: Cells returned from the iterator can be re-used for cells at the same level. So you can't simply iterate to subsequent cells and still refer to the former cell nor the bytes returned from the former cell, unless you know the former cell is a parent.
getTreeCellIterator in class SpatialPrefixTreeshape - the shape; possibly null but the caller should liberally call
remove() if so.detailLevel - the maximum detail level to get cells forCopyright © 2000-2024 Apache Software Foundation. All Rights Reserved.