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| How do I create a map of the Pacific Ocean? The problem is the International Date Line where the longitude goes from -180 to +180 degrees. |
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Surfer, MapViewer, and Didger all use coordinates that increase in the X and Y directions. There is not a way to center on 180°/-180°.
To work around the problem, you can either:
1. 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 Arrange | Align Objects commands to arrange them so they line up. You should not overlay them, since that will move them back.
2. You can add 360 to the X coordinate, especially in the range from -180 to -30. Use a file like Pacificp.gsb (attached, or from our Web Site) to display the base map with positive coordinates from -180 to -30.
 Pacificp.gsb base map in Surfer.
 Pacificp.gsb base map in MapViewer converted to Mercator projection. |
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