PolynomialProjection Class
A map projection defined via ground control points (rubber-sheeting).
NuGet/Assembly: Carmenta.Engine.5.16.2.nupkg (in the CECore assembly)
Syntax
public class PolynomialProjection : ProjectionRemarks
With a PolynomialProjection, you can specify ground control points to georeference data (normally an image) that lacks ordinary georeferencing.
You have to identify some distinct points in the image and figure out their coordinates, expressed both as image pixel coordinates and georeferenced coordinates (map coordinates of a known Crs).
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The list of pixel coordinates is then given as the ImagePoints, while the list of georeferenced coordinates is given as the GeoreferencedPoints. The map projection used for the georeferenced coordinates is given as the Projection property.
From this information, the PolynomialProjection creates a polynomial function that morphs between the known map projection of the GeoreferencedPoints into the pixel coordinate system of the image, so that the ground control points are morphed to their (approximately) correct position.
Inheritance Hierarchy
System.Object (not available in C#)
EngineObject
ResourceObject
Projection
PolynomialProjection
Platforms
Windows, Linux, Android
PolynomialProjection Members
The PolynomialProjection type has the following members.
Constructors
| Name | Description |
|---|---|
| PolynomialProjection | Initializes a new instance of the PolynomialProjection class. |
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 |
| GeoreferencedPoints | Gets the collection of ground control points, expressed in the Projection projection. |
| ImagePoints | Gets the collection of ground control points, expressed in image pixel coordinates. |
| IsDisposed | Gets a value that tells whether the current PolynomialProjection has been disposed. Inherited from EngineObject |
 LongLat | Gets a pre-defined LongLatProjection instance. Inherited from Projection |
| Name | Gets or sets the name of the PolynomialProjection. Inherited from ResourceObject |
| NativeHandle | Gets the native Carmenta Engine kernel object the current PolynomialProjection represents. Inherited from EngineObject |
| PolynomialDegree | Gets the degree of the polynomial (1, 2 or 3). |
| Projection | Gets the map projection used for the GeoreferencedPoints. |
| 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 |
| GetErrorEstimation | Estimates the error, expressed in image pixels. |
| Utm | Returns one of the 120 predefined instances of Universal Transverse Mercator. Inherited from Projection |