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9ea131ded2
Always calculates the scale at the equator, regardless of the actual visible map extent. This method can be used to provide a consistent, static scale for maps in geographic reference systems, regardless of the latitudes actually visible in the map (permitting consistent appearance of these maps when rendering relies on scale based visibility or calculations). Otherwise a project in eg EPSG:4326 which uses scale based visibility of layers and symbols will see layers and features "randomly" disappear as the map is panned, even though the user has not zoomed in or out of the map. This method is only applicable when calculating scales with a degree based reference system.