IdentityDatumShift Class
Says that two geodetic datums are identical.
NuGet/Assembly: Carmenta.Engine.5.16.2.nupkg (in the CECore assembly)
Syntax
public class IdentityDatumShift : DatumShiftRemarks
If an IdentityDatumShift is attached to a new GeodeticDatum, the new datum will be regarded as identical to an old one, namely the KnownDatum of the IdentityDatumShift. For example, if you define a new GeodeticDatum for ETRS89, European Terrestrial Reference System 1989, you can attach an IdentityDatumShift that refers to the predefined Wgs84 as the KnownDatum. This tells Carmenta Engine to regard longitude and latitude as identical in ETRS89 and Wgs84. (In reality, this was true on January 1, 1989, but the continental drift has separated the datums by 2.5 centimeters per year since then. Most GIS applications can ignore this difference.)
If a dataset reads its Crs from file, and the DatumShiftChoice of the dataset is Lenient, then the geodetic datum of the Crs will always be assigned some datum shift to Wgs84. If Carmenta does not know any published datum shift (and no datum shift can be read from the dataset files), then the geodetic datum will get an IdentityDatumShift to Wgs84, as a last resort.
Inheritance Hierarchy
System.Object (not available in C#)
EngineObject
ResourceObject
DatumShift
IdentityDatumShift
Platforms
Windows, Linux, Android
IdentityDatumShift Members
The IdentityDatumShift type has the following members.
Constructors
| Name | Description |
|---|---|
| IdentityDatumShift | Creates a new IdentityDatumShift. |
Properties
| Name | Description |
|---|---|
| Authority | Gets the name of an authority, which is often "epsg". Inherited from DatumShift |
| AuthorityCode | Gets the unique code for the datum shift instance, according to the Authority, for example "15978". Inherited from DatumShift |
| Info | Gets documentation like accuracy and area of use. Inherited from DatumShift |
| IsDisposed | Gets a value that tells whether the current IdentityDatumShift has been disposed. Inherited from EngineObject |
| KnownDatum | Gets the known datum, usually WGS84. Inherited from DatumShift |
| Name | Gets or sets the name of the IdentityDatumShift. Inherited from ResourceObject |
| NativeHandle | Gets the native Carmenta Engine kernel object the current IdentityDatumShift represents. Inherited from EngineObject |
| IUserProperties.UserProperties | Gets the AttributeSet that contains the user properties. Inherited from IUserProperties |
Methods
| Name | Description |
|---|---|
| Clone | Creates a copy of an object. Inherited from EngineObject |
| Dispose | Releases the reference to the native Carmenta Engine kernel instance the EngineObject represents. Inherited from EngineObject |
| Equals | Determines whether this instance is equal to another. Inherited from EngineObject |
 FromInfo | Constructs a datum shift from a DatumShiftInfo. Inherited from DatumShift |