Geobox (net.sf.mardao:mardao-core 2.3.3 API)

java.lang.Object
- net.sf.mardao.core.geo.Geobox

```
public class Geobox
extends Object
```

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`BITS_10_39km` 10 bits gives a box of 39km at the Equator
`static int`	`BITS_12_10km` 12 bits gives a box of 9.8km at the Equator
`static int`	`BITS_15_1224m` 15 bits gives a box of 1224m at the Equator
`static int`	`BITS_17_307m` 17 bits gives a box of 307m at the Equator
`static int`	`BITS_18_154m` 18 bits gives a box of 154m at the Equator
`static int`	`BITS_19_77m` 19 bits gives a box of 77.5m at the Equator
`static int`	`BITS_20_39m` 20 bits gives a box of 39m at the Equator
`static int`	`BITS_21_19m` 21 bits gives a box of 19.1m at the Equator
`static int`	`BITS_22_10m` 22 bits gives a box of 10.6m at the Equator
`static int`	`BITS_23_53dm` 23 bits gives a box of 5.3m at the Equator
`static int`	`BITS_24_32dm` 24 bits gives a box of 3.2m at the Equator
`static int`	`RADIUS`

Constructor Summary

Constructors
Constructor and Description

Geobox()

Constructors
Constructor and Description
`Geobox()`

Method Summary

Methods
Modifier and Type	Method and Description
`static String`	`compute(double lat, double lng, int resolution, int slice)`
`static List<String>`	`computeSet(double lat, double lng, int resolution, double slice)`
`static double`	`distance(DLocation p1, DLocation p2)` Calculates the great circle distance between two points (law of cosines).
`static long`	`getCell(float lat, float lng, int precision)`
`static long`	`getHash(float lat, float lng, int bits)`
`protected static long`	`getHashIterative(float major, float minor, int bits)`
`protected static long`	`getHashRecursive(float major, float minor, int bit, float dMajor, float dMinor)`
`static long`	`getMask(float x, float base, int bits)`
`static Set<Long>`	`getTuple(float lat, float lng, int bits)`
`static double`	`makeDoubleInRange(double d)` This function is used to fix issue 10: GeocellUtils.distance(...) uses Math.acos(arg) method.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - RADIUS
```
public static final int RADIUS
```
    See Also:
    Constant Field Values
  - BITS_10_39km
```
public static final int BITS_10_39km
```
    10 bits gives a box of 39km at the Equator
    
    See Also:
    Constant Field Values
  - BITS_12_10km
```
public static final int BITS_12_10km
```
    12 bits gives a box of 9.8km at the Equator
    
    See Also:
    Constant Field Values
  - BITS_15_1224m
```
public static final int BITS_15_1224m
```
    15 bits gives a box of 1224m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_17_307m
```
public static final int BITS_17_307m
```
    17 bits gives a box of 307m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_18_154m
```
public static final int BITS_18_154m
```
    18 bits gives a box of 154m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_19_77m
```
public static final int BITS_19_77m
```
    19 bits gives a box of 77.5m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_20_39m
```
public static final int BITS_20_39m
```
    20 bits gives a box of 39m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_21_19m
```
public static final int BITS_21_19m
```
    21 bits gives a box of 19.1m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_22_10m
```
public static final int BITS_22_10m
```
    22 bits gives a box of 10.6m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_23_53dm
```
public static final int BITS_23_53dm
```
    23 bits gives a box of 5.3m at the Equator
    
    See Also:
    Constant Field Values
  - BITS_24_32dm
```
public static final int BITS_24_32dm
```
    24 bits gives a box of 3.2m at the Equator
    
    See Also:
    Constant Field Values
- Constructor Detail
  - Geobox
```
public Geobox()
```
- Method Detail
  - getMask
```
public static long getMask(float x,
           float base,
           int bits)
```
  - getHash
```
public static long getHash(float lat,
           float lng,
           int bits)
```
  - getTuple
```
public static Set<Long> getTuple(float lat,
                 float lng,
                 int bits)
```
  - getHashRecursive
```
protected static long getHashRecursive(float major,
                    float minor,
                    int bit,
                    float dMajor,
                    float dMinor)
```
  - getHashIterative
```
protected static long getHashIterative(float major,
                    float minor,
                    int bits)
```
  - getCell
```
public static long getCell(float lat,
           float lng,
           int precision)
```
    Parameters:
    lat -
    lng -
    precision - in nibbles (4 bits per nibble)
    
    Returns:
    the geohash long for specified lat,long,precision
  - compute
```
public static String compute(double lat,
             double lng,
             int resolution,
             int slice)
```
  - computeSet
```
public static List<String> computeSet(double lat,
                      double lng,
                      int resolution,
                      double slice)
```
  - distance
```
public static double distance(DLocation p1,
              DLocation p2)
```
    Calculates the great circle distance between two points (law of cosines).
    
    Parameters:
    p1 - indicating the first point.
    p2 - indicating the second point.
    
    Returns:
    The 2D great-circle distance between the two given points, in meters.
  - makeDoubleInRange
```
public static double makeDoubleInRange(double d)
```
    This function is used to fix issue 10: GeocellUtils.distance(...) uses Math.acos(arg) method. In some cases arg > 1 (i.e 1.0000000002), so acos cannot be calculated and the method returns NaN.
    
    Parameters:
    d -
    
    Returns:
    a double between -1 and 1

Class Geobox

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

RADIUS

BITS_10_39km

BITS_12_10km

BITS_15_1224m

BITS_17_307m

BITS_18_154m

BITS_19_77m

BITS_20_39m

BITS_21_19m

BITS_22_10m

BITS_23_53dm

BITS_24_32dm

Constructor Detail

Geobox

Method Detail

getMask

getHash

getTuple

getHashRecursive

getHashIterative

getCell

compute

computeSet

distance

makeDoubleInRange