RosenmundObliqueMercatorProjection Class
A map projection, also known as Swiss Oblique Cylindrical or Swiss Oblique Mercator. Used in Switzerland and Hungary.
NuGet/Assembly: Carmenta.Engine.5.16.2.nupkg (in the CECore assembly)
Syntax
public class RosenmundObliqueMercatorProjection : ProjectionRemarks
The Rosenmund Oblique Mercator is a kind of oblique Mercator projection, used for conformal mapping.
The Rosenmund is used only for Switzerland, Liechtenstein and Hungary.
Of the various oblique Mercator variants for the ellipsoid, Rosenmund deviates the most from the ideal that the central line should be a great circle (shortest route) with constant scale. But the deviations are small near the northmost point of the central line, which is the area that the Rosenmund is intended for. The azimuth of the central line at the projection center is always 90° (due east) - you cannot specify the azimuth as you can in other oblique Mercator projections.
The Rosenmund projection is suitable for regions that have greater extent west-east than north-south. (But so is the more common LambertConformalConicProjection, and it is not obvious that Rosenmund is better than Lambert for Switzerland and Hungary.)
The RosenmundObliqueMercatorProjection is intended for national mapping, and it is possible to zoom out to show almost a hemisphere. But the projection does not work well as a world map.
Accuracy
The Earth is assumed to be an ellipsoid, and the formulas are highly accurate. However, Hungary really uses a slight variation of the Rosenmund projection. So, when using our (Swiss) implementation for Hungary, there will be errors, but we think they are at most 0.5 centimeter. (And the other kinds of oblique Mercator would be worse than Rosenmund for Hungary.)
Literature
Inheritance Hierarchy
System.Object (not available in C#)
EngineObject
ResourceObject
Projection
RosenmundObliqueMercatorProjection
Platforms
Windows, Linux, Android
RosenmundObliqueMercatorProjection Members
The RosenmundObliqueMercatorProjection type has the following members.
Constructors
| Name | Description |
|---|---|
| RosenmundObliqueMercatorProjection | Initializes a new instance of the RosenmundObliqueMercatorProjection class from parameters. |
Properties
| Name | Description |
|---|---|
| Authority | Gets the name of an authority, which is often "epsg". Inherited from Projection |
| AuthorityCode | Gets the unique code for the projection instance, according to the Authority, for example "19883". Inherited from Projection |
| CentralLatitude | Gets the central latitude, also known as latitude of origin. |
| CentralLongitude | Gets the central longitude, also known as central meridian or longitude of origin. |
| FalseEasting | Gets the offset added to the projected x coordinates (the eastings). |
| FalseNorthing | Gets the offset added to the projected y coordinates (the northings). |
| IsDisposed | Gets a value that tells whether the current RosenmundObliqueMercatorProjection has been disposed. Inherited from EngineObject |
| LengthUnit | Gets the length unit of the projected coordinates. |
 LongLat | Gets a pre-defined LongLatProjection instance. Inherited from Projection |
| Name | Gets or sets the name of the RosenmundObliqueMercatorProjection. Inherited from ResourceObject |
| NativeHandle | Gets the native Carmenta Engine kernel object the current RosenmundObliqueMercatorProjection represents. Inherited from EngineObject |
| ScaleFactor | A scale factor, by which all projected coordinates will be multiplied. |
| 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 |
| Utm | Returns one of the 120 predefined instances of Universal Transverse Mercator. Inherited from Projection |