Datum (MeteoInfoLib 1.9 API)

java.lang.Object
- org.meteoinfo.projection.proj4j.datum.Datum

```
public class Datum
extends Object
```
A class representing a geodetic datum.
A geodetic datum consists of a set of reference points on or in the Earth, and a reference Ellipsoid giving an approximation to the true shape of the geoid.
In order to transform between two geodetic points specified on different datums, it is necessary to transform between the two datums. There are various ways in which this datum conversion may be specified:
- A 3-parameter conversion
- A 7-parameter conversion
- A grid-shift conversion
In order to be able to transform between any two datums, the parameter-based transforms are provided as a transform to the common WGS84 datum. The WGS transforms of two arbitrary datum transforms can be concatenated to provide a transform between the two datums.
Notable datums in common use include NAD83 and WGS84.

字段概要

字段
限定符和类型	字段	说明
`static Datum`	`CARTHAGE`
`static double`	`ELLIPSOID_E2_TOLERANCE`
`static Datum`	`GGRS87`
`static Datum`	`HERMANNSKOGEL`
`static Datum`	`IRE65`
`static Datum`	`NAD27`
`static Datum`	`NAD83`
`static Datum`	`NZGD49`
`static Datum`	`OSEB36`
`static Datum`	`POTSDAM`
`static int`	`TYPE_3PARAM`
`static int`	`TYPE_7PARAM`
`static int`	`TYPE_GRIDSHIFT`
`static int`	`TYPE_UNKNOWN`
`static int`	`TYPE_WGS84`
`static Datum`	`WGS84`

构造器概要

构造器
构造器	说明
`Datum()`
`Datum(String code, double[] transform, Ellipsoid ellipsoid, String name)`
`Datum(String code, double deltaX, double deltaY, double deltaZ, double rx, double ry, double rz, double mbf, Ellipsoid ellipsoid, String name)`
`Datum(String code, double deltaX, double deltaY, double deltaZ, Ellipsoid ellipsoid, String name)`
`Datum(String code, String transformSpec, Ellipsoid ellipsoid, String name)`

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`String`	`getCode()`
`Ellipsoid`	`getEllipsoid()`
`String`	`getName()`
`double[]`	`getTransformToWGS84()`
`int`	`getTransformType()`
`boolean`	`hasTransformToWGS84()`
`boolean`	`isEqual(Datum datum)`	Tests if this is equal to another `Datum`.
`void`	`readEsriString(String esriString)`	Read ESRI projection string
`String`	`toEsriString()`	To Esri string of datum part
`String`	`toString()`
`void`	`transformFromGeocentricToWgs84(ProjCoordinate p)`
`void`	`transformToGeocentricFromWgs84(ProjCoordinate p)`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细资料

TYPE_UNKNOWN
```
public static final int TYPE_UNKNOWN
```
另请参阅:

常量字段值

TYPE_WGS84
```
public static final int TYPE_WGS84
```
另请参阅:

常量字段值

TYPE_3PARAM
```
public static final int TYPE_3PARAM
```
另请参阅:

常量字段值

TYPE_7PARAM
```
public static final int TYPE_7PARAM
```
另请参阅:

常量字段值

TYPE_GRIDSHIFT
```
public static final int TYPE_GRIDSHIFT
```
另请参阅:

常量字段值

WGS84
```
public static final Datum WGS84
```

GGRS87
```
public static final Datum GGRS87
```

NAD83
```
public static final Datum NAD83
```

NAD27
```
public static final Datum NAD27
```

POTSDAM
```
public static final Datum POTSDAM
```

CARTHAGE
```
public static final Datum CARTHAGE
```

HERMANNSKOGEL

public static final Datum HERMANNSKOGEL

IRE65
```
public static final Datum IRE65
```

NZGD49
```
public static final Datum NZGD49
```

OSEB36
```
public static final Datum OSEB36
```

ELLIPSOID_E2_TOLERANCE

public static final double ELLIPSOID_E2_TOLERANCE

另请参阅:: 常量字段值

构造器详细资料

Datum
```
public Datum()
```

Datum

public Datum(String code,
             String transformSpec,
             Ellipsoid ellipsoid,
             String name)

Datum

public Datum(String code,
             double deltaX,
             double deltaY,
             double deltaZ,
             Ellipsoid ellipsoid,
             String name)

Datum

public Datum(String code,
             double deltaX,
             double deltaY,
             double deltaZ,
             double rx,
             double ry,
             double rz,
             double mbf,
             Ellipsoid ellipsoid,
             String name)

Datum

public Datum(String code,
             double[] transform,
             Ellipsoid ellipsoid,
             String name)

方法详细资料
- getCode
```
public String getCode()
```
- getName
```
public String getName()
```
- toString
```
public String toString()
```
  覆盖:
  
  toString 在类中 Object
- getEllipsoid
```
public Ellipsoid getEllipsoid()
```
- getTransformToWGS84
```
public double[] getTransformToWGS84()
```
- getTransformType
```
public int getTransformType()
```
- hasTransformToWGS84
```
public boolean hasTransformToWGS84()
```
- isEqual
```
public boolean isEqual(Datum datum)
```
  Tests if this is equal to another Datum.
  Datums are considered to be equal iff:
  - their transforms are equal
  - OR their ellipsoids are (approximately) equal
  参数:
  
  datum -
  
  返回:
  
  If is equal
- transformFromGeocentricToWgs84
```
public void transformFromGeocentricToWgs84(ProjCoordinate p)
```
- transformToGeocentricFromWgs84
```
public void transformToGeocentricFromWgs84(ProjCoordinate p)
```
- readEsriString
```
public void readEsriString(String esriString)
```
  Read ESRI projection string
  
  参数:
  
  esriString - ESRI projection string
- toEsriString
```
public String toEsriString()
```
  To Esri string of datum part
  
  返回:
  
  Esri string of datum part

类 Datum

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

TYPE_UNKNOWN

TYPE_WGS84

TYPE_3PARAM

TYPE_7PARAM

TYPE_GRIDSHIFT

WGS84

GGRS87

NAD83

NAD27

POTSDAM

CARTHAGE

HERMANNSKOGEL

IRE65

NZGD49

OSEB36

ELLIPSOID_E2_TOLERANCE

构造器详细资料

Datum

Datum

Datum

Datum

Datum

方法详细资料

getCode

getName

toString

getEllipsoid

getTransformToWGS84

getTransformType

hasTransformToWGS84

isEqual

transformFromGeocentricToWgs84

transformToGeocentricFromWgs84

readEsriString

toEsriString