How do I create a map of the Pacific Ocean in Surfer? The problem is the International Date Line where the longitude goes from -180 to +180 degrees.

Surfer uses coordinates that increase in the X and Y directions.  There is not a way to center a map on 180°/-180°. 


To work around this, you can :

  • Create two maps. One for the left side, from 0° to 180°, and another for the right side from -180° to 0. Then use the Layout | Arrange | Align commands to arrange them so they line up. You should not overlay them, since that will move them back.
  • Add 360 to the X coordinate.
  • Use a file like Pacificp.gsb (attached) to display the base map with positive coordinates from -30 to 360.

Pacificp.gsb base map in Surfer.

Pacificp.gsb base map converted to Mercator projection.


Updated February 10, 2017

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