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Projections and Coordinate Systems

It's recommended to read the VTP website regarding Coordinate Systems and Map Projections.

Technically speaking, what VTBuilder refers to as a "projection" is actually a "coordinate reference system", or CRS for short.  However, since a great may CRS are projected, it is a common colloquial usage to refer to a CRS as a projection.

Projection Dialog

This dialog is displayed on the menu items View: Set or Convert Projection, and also when VTBuilder needs to ask you for a CRS, such as when importing a file which lacks a CRS.

There are several fields which define a CRS, which are displayed in the dialog:

There are also some commands to make specifying projections easier: