de.alpharogroup.jgeohash

Class GeoHashUtils

java.lang.Object

de.alpharogroup.jgeohash.GeoHashUtils

public class GeoHashUtils
extends Object

GeoHashUtils is based on http://en.wikipedia.org/wiki/Geohash

Constructor Summary

Constructors

Constructor and Description
GeoHashUtils()

Method Summary

Modifier and Type	Method and Description
static double[]	decode(String geohash) Decode the given geohash into a latitude and longitude.
static double[]	decodeAndRound(String geohash) Decodes the given geohash into a latitude and longitude.
static String	encode(double latitude, double longitude) Encodes the given latitude and longitude into a geohash code.
static String	getAdjacent(String geohash, String... directions) Gets the adjacent from the given directions.
static String	getAdjacent(String geohash, String direction) Gets the adjacent from the given direction.
static List<String>	getAllAdjacentAreasList(String geohash) Gets the all adjacent areas list.
static Map<String,String>	getAllAdjacentAreasMap(String geohash) Gets the geohash cells around the given geohash cell.
static FirstAndSecondRingRegion	getFirstAndSecondRingRegion(String geohash)
static FirstRingRegion	getFirstRingRegion(String geohash) Gets the geohash cells around the given geohash cell as a GeoHashRegion object.
static double	getLatitude(String geohash) Gets the latitude from the given geohash value.
static double	getLongitude(String geohash) Gets the longitude from the given geohash value.
static Map<String,String>	getTwentyFiveAreasMap(String geohash) Gets the eight cells around the given geohash cell so the first ring inclusive the given geohash cell and cells from the second ring.
static void	main(String[] args) The main method.

Methods inherited from class java.lang.Object

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

Constructor Detail

GeoHashUtils

public GeoHashUtils()

Method Detail

getAdjacent

public static String getAdjacent(String geohash,
                                 String direction)

Gets the adjacent from the given direction. For instance if direction is 'top' then the top adjacent geohash code will be returned.

Parameters:

geohash - the geohash

direction - the direction

Returns:

the geohash code for the adjacent from the given direction.

getAdjacent

public static String getAdjacent(String geohash,
                                 String... directions)

Gets the adjacent from the given directions. For instance if directions is 'top' and 'feft' then the topleft adjacent geohash code will be returned.

Parameters:

geohash - the geohash

directions - the directions

Returns:

the geohash code for the adjacent from the given directions.

decode

public static double[] decode(String geohash)

Decode the given geohash into a latitude and longitude.

Parameters:

geohash - the geohash

Returns:

the double[]

decodeAndRound

public static double[] decodeAndRound(String geohash)

Decodes the given geohash into a latitude and longitude.

Parameters:

geohash - the geohash

Returns:

the double[]

getLatitude

public static double getLatitude(String geohash)

Gets the latitude from the given geohash value.

Parameters:

geohash - the geohash

Returns:

the latitude

getLongitude

public static double getLongitude(String geohash)

Gets the longitude from the given geohash value.

Parameters:

geohash - the geohash

Returns:

the longitude

encode

public static String encode(double latitude,
                            double longitude)

Encodes the given latitude and longitude into a geohash code.

Parameters:

latitude - the latitude

longitude - the longitude

Returns:

The generated geohash from the given latitude and longitude.

main

public static void main(String[] args)

The main method.

Parameters:

args - the arguments

getFirstRingRegion

public static FirstRingRegion getFirstRingRegion(String geohash)

Gets the geohash cells around the given geohash cell as a GeoHashRegion object.

Parameters:

geohash - the geohash

Returns:

a GeoHashRegion object calculated from the given geohash value.

getFirstAndSecondRingRegion

public static FirstAndSecondRingRegion getFirstAndSecondRingRegion(String geohash)

getAllAdjacentAreasMap

public static Map<String,String> getAllAdjacentAreasMap(String geohash)

Gets the geohash cells around the given geohash cell. With other words it gets eight cells around the given geohash cell so the first ring inclusive the given geohash cell.

Parameters:

geohash - the geohash

Returns:

all geohash cells around the given geohash cell.

getTwentyFiveAreasMap

public static Map<String,String> getTwentyFiveAreasMap(String geohash)

Gets the eight cells around the given geohash cell so the first ring inclusive the given geohash cell and cells from the second ring. The result is 24 cells plus the given geohash cell.

Parameters:

geohash - the geohash

Returns:

the eight cells around the given geohash cell so the first ring inclusive the given geohash cell and cells from the second ring.

getAllAdjacentAreasList

public static List<String> getAllAdjacentAreasList(String geohash)

Gets the all adjacent areas list.

Parameters:

geohash - the geohash

Returns:

the all adjacent areas list