Main Content


Interactively modify map parallels


Command Line



parallelui on

parallelui off

Tools > Parallels (menu)


parallelui toggles the parallel tool on and off.

parallelui on activates the parallel tool

parallelui off deactivates the parallel tool

The parallelui GUI provides a tool to modify the standard parallels of a displayed map projection. One or two red lines are displayed where the standard parallels are currently located. The parallel lines can be dragged to new locations, and the map reprojected with the locations of the parallel lines as the new standard parallels.


Mouse Interaction

A single-click-and-drag moves the parallel lines. A double-click on one of the standard parallels reprojects the map using the new parallel locations.

Version History

Introduced before R2006a

See Also