Provides access to members that control additional properties and methods for all geographic coordinate systems.
When To Use
Use IGeographicCoordinateSystem2 when you need to work with map projection horizons or transform between two geographic coordinate systems.
Members
| Name | Description | |
|---|---|---|
 |
Abbreviation | The abbreviated name of this spatial reference component. |
|
Alias | The alias of this spatial reference component. |
|
AngularConversionFactor | A factor to convert angular units from current GCS to destination GCS. |
 |
Changed | Notify this object that some of its parts have changed (parameter values, z unit, etc.). |
|
CoordinateUnit | The angular unit of this geographic coordinate system. |
|
Datum | The horizontal datum of this geographic coordinate system. |
 |
ExtentHint | Calculates a 360 degree longitude range from information in the specified envelope and the domain extent of the GCS. |
|
FactoryCode | The factory code (WKID) of the spatial reference. |
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GetDomain | The XY domain extent. |
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GetFalseOriginAndUnits | Get the false origin and units. |
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GetGCSParams | Returns the 180 degrees equivalent and horizon delta in proper GCS units. |
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GetHorizon | Returns a standard horizon polygon, its envelope and whether it is inclusive or exclusive; the horizon polygon may be 0. |
|
GetMDomain | The measure domain extent. |
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GetMFalseOriginAndUnits | Get the measure false origin and units. |
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GetZDomain | The Z domain extent. |
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GetZFalseOriginAndUnits | Get the Z false origin and units. |
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HasMPrecision | Returns true when m-value precision information has been defined. |
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HasXYPrecision | Returns true when (x,y) precision information has been defined. |
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HasZPrecision | Returns true when z-value precision information has been defined. |
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IsPrecisionEqual | Returns TRUE when the precision information for the two spatial references is the same. |
 |
LeftLongitude | The least (left) longitude bounding a 360 degree range. |
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Name | The name of this spatial reference component. |
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PrecisionExImpl | An opaque reference to the precision information (including z/m awareness) implementation for this spatial reference. |
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PrecisionImpl | An opaque reference to the precision information implementation for this spatial reference. |
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PrimeMeridian | The prime meridian of this geographic coordinate system. |
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Remarks | The comment string of this spatial reference component. |
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RightLongitude | The greatest (right) longitude bounding a 360 degree range. |
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SetDomain | The XY domain extent. |
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SetFalseOriginAndUnits | Set the false origin and units. |
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SetMDomain | The measure domain extent. |
|
SetMFalseOriginAndUnits | Set the measure false origin and units. |
|
SetZDomain | The Z domain extent. |
|
SetZFalseOriginAndUnits | Set the Z false origin and units. |
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SpatialReferenceImpl | SpatialReferenceImpl. |
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Usage | The usage notes of this geographic coordinate system. |
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ZCoordinateUnit | The unit for the Z coordinate. |
IGeographicCoordinateSystem2.AngularConversionFactor Property
A factor to convert angular units from current GCS to destination GCS.
Public Function get_AngularConversionFactor ( _
ByVal pDstGCS As IGeographicCoordinateSystem2 _
) As Double
public double get_AngularConversionFactor (
IGeographicCoordinateSystem2 pDstGCS
);
Description
AngularConversionFactorcalculates the value to convert the unit of measure in the current geographic coordinate system to the destination or target geographic coordinate system.
IGeographicCoordinateSystem2.ExtentHint Property
Calculates a 360 degree longitude range from information in the specified envelope and the domain extent of the GCS.
Public WriteOnly Property ExtentHint
public void ExtentHint {set;}
Description
The ExtentHint, LeftLongitude, and RightLongitude properties are interrelated. Usually, data in a geographic coordinate system has longitude values between -180 and 180 if the unit of measure is degrees. Some datasets are designed to use a minimum longitude value of 0 or -360. The LeftLongitude property controls whether the data is considered as -360 to 0, -180 to 180, or 0 to 360. If two datasets have spatial references with different LeftLongitude values, one needs to be converted to match the other one. You can do this with the GeoNormalize method on IGeometry. ExtentHint is calculated internally by looking at the extent of the data. If the results used to set the LeftLongitude property are incorrect, you can use an envelope to set ExtentHint.
IGeographicCoordinateSystem2.GetGCSParams Method
Returns the 180 degrees equivalent and horizon delta in proper GCS units.
Public Sub GetGCSParams ( _
ByRef p_180 As Double, _
ByRef pDelta As Double _
)
public void GetGCSParams (
ref double p_180,
ref double pDelta
);
Description
GetGCSParamscalculates the edge of the horizon for a geographic coordinate system. For example, if your coordinate system is in decimal degrees, 180 is returned. If the units are in grads, 200 is returned. It also returns a delta, a small offset value, in the correct unit of measure.
IGeographicCoordinateSystem2.GetHorizon Method
Returns a standard horizon polygon, its envelope and whether it is inclusive or exclusive; the horizon polygon may be 0.
Public Sub GetHorizon ( _
ByRef horizonEnvelope As WKSEnvelope _
)
public void GetHorizon (
ref WKSEnvelope horizonEnvelope
);
Description
GetHorizonreturns an envelope. See also the IProjectedCoordinateSystem2::GetHorizonmethod.
IGeographicCoordinateSystem2.LeftLongitude Property
The least (left) longitude bounding a 360 degree range.
Public Function get_LeftLongitude ( _
ByVal inDegrees As Boolean _
) As Double
Public Sub set_LeftLongitude ( _
ByVal inDegrees As Boolean, _
ByVal LeftLongitude As Double _
)
public double get_LeftLongitude (
bool inDegrees
);
public void set_LeftLongitude (
bool inDegrees,
double LeftLongitude
);
Description
Returns or sets the minimum longitude value for a particular geographic coordinate system.
The ExtentHint, LeftLongitude, and RightLongitude properties are interrelated. Usually, data in a geographic coordinate system has longitude values between -180 and 180 if the unit of measure is degrees. Some datasets are designed to use a minimum longitude value of 0 or -360. The LeftLongitude property controls whether the data is considered as -360 to 0, -180 to 180, or 0 to 360. If two datasets have spatial references with different LeftLongitude values, one needs to be converted to match the other one. You can do this with the GeoNormalize method on IGeometry. ExtentHint is calculated internally by looking at the extent of the data. If the results used to set the LeftLongitude property are incorrect, you can use an envelope to set ExtentHint.
IGeographicCoordinateSystem2.RightLongitude Property
The greatest (right) longitude bounding a 360 degree range.
Public Function get_RightLongitude ( _
ByVal inDegrees As Boolean _
) As Double
Public Sub set_RightLongitude ( _
ByVal inDegrees As Boolean, _
ByVal RightLongitude As Double _
)
public double get_RightLongitude (
bool inDegrees
);
public void set_RightLongitude (
bool inDegrees,
double RightLongitude
);
Description
Returns or sets the maximum longitude value for a particular geographic coordinate system.
The ExtentHint, LeftLongitude, and RightLongitude properties are interrelated. Usually, data in a geographic coordinate system has longitude values between -180 and 180 if the unit of measure is degrees. Some datasets are designed to use a minimum longitude value of 0 or -360. The LeftLongitude property controls whether the data is considered as -360 to 0, -180 to 180, or 0 to 360. If two datasets have spatial references with different LeftLongitude values, one needs to be converted to match the other one. You can do this with the GeoNormalize method on IGeometry. ExtentHint is calculated internally by looking at the extent of the data. If the results used to set the LeftLongitude property are incorrect, you can use an envelope to set ExtentHint.
Inherited Interfaces
| Interfaces | Description |
|---|---|
| IGeographicCoordinateSystem | Provides access to members that control access to all properties of geographic coordinate systems. |
| ISpatialReference | Provides access to members that control a SpatialReference. |
| ISpatialReferenceInfo | Provides access to members that control the properties common to all components of a spatial reference system. |
Classes that implement IGeographicCoordinateSystem2
| Classes | Description |
|---|---|
| GeographicCoordinateSystem | Creates a geographic coordinate system. |