It displays the window used to create a new transformation model or to edit the properties of an existing one.

Description

Transformation model name

Introduce the name of the transformation model.

Transformation description

Introduce the description of the transformation, informative text.

Initial / Final Coordinate Reference System (CRS)

The initial coordinate reference system (CRS) represents the system of coordinates in which the points to be transformed are introduced. The first coordinate operation of the transformation model must have as input data the type of coordinates chosen for this coordinate reference system.

The final coordinate reference system (CRS) represents the coordinate system in which the points of the initial system will be transformed. The last coordinate operation of the transformation model must have as output data the type of coordinates chosen for this coordinate reference system.

System name

The name of the initial or final coordinate reference system.

Button Select CRS from the EPSG database ...

By clicking this button you can select the initial or the final coordinate reference system (CRS) from the EPSG database.

Coordinates type

The type of coordinates of the initial or final system. These can be:
• Cartesian (X, Y, Z);
• geographic 2D (φ, λ);
• geographic 3D (φ, λ, h);
• in the 2D projection plane (N, E);
• in the 3D projection plane (N, E, H).

EPSG CRS code

The corresponding CRS code from the EPSG database. The value is used for identification in the EPSG database or in the database on the Internet.

Alternative name for the North axis

In the case of projection systems (N,E) or (N,E,H) you can introduce an alternative name for the North axis. The name appears in the head row of all tables that contain the North coordinate.

Alternative name for the East axis

In the case of projection systems (N,E) or (N,E,H) you can introduce an alternative name for the East axis. The name appears in the head row of all tables that contain the East coordinate.

Button Invert systems ...

By using this button you can invert the coordinate reference systems. Inverting is made only for the written values from the two boxes with coordinate reference systems. This button does not change the direction of the operations with coordinates.

Transformation Accuracy (informative value)

Total Accuracy

Introduce the total accuracy of the transformation. This information is useful to estimate the transformation quality.

In case of models automatically generated from the EPSG database this value is calculated from the accuracies of operations with coordinates that were used (see The window of creating a new transformation model from the EPSG database). Because it is possible that in the EPSG database for some operations with coordinates the accuracy not to be defined (in which case the accuracy is considered 999.0m) you should check this value and if it is necessary enter it manually.

Lock to prevent accidental changes

It sets the model as locked or not. This setting can also be made through the contextual menu that appears with the mouse right click on the transformation model from the list of models by choosing from the menu the Locked command. By locking a model the operations of deleting a model or its coordinate operations, of modifying its coordinate operations or of adding new coordinate operations can no longer be made.

Note: We recommend using the locking option to prevent accidental modifications after verifying the transformation for a newly created model. You could also save the transformation model in a file for when the program is uninstalled or when a newer version is installed such as not to lose the newly created models.