Activity for Gary E. Miller
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Gary E. Miller posted a comment on discussion Open Discussion
Ah, never mind. I just dre myself a map, maybe I get it now. Sorry for the confusion.
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"GeographicLib does not ignore the longitude at the poles." Agreed. Clearly obvious from the results. But it computes wrong. The magnetic variation can not be all those different values at the exact same location. What do you think the magnetic variation is at the Poles? 1.05, -88.95, -178.95, 91.05, or -178.95? I want to use this to create a 5x5 degree table for bilinear interpolation. The same way geoid separation is done in most GNSS receivers. I can't do that when cells that should contain identical...
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I tried using your MagneticField, but I get bizzare results. For example. If I am at the North Pole (90N), then the longitude does not affect my location. Yet the calcualtor gives me wildly different results based on the longitude? $ MagneticField now 90N 0W 1.05 88.08 1893.9 1893.6 34.7 56588.6 56620.3 now 90N 90W -88.95 88.08 1893.9 34.7 -1893.6 56588.6 56620.3 now 90N 180W -178.95 88.08 1893.9 -1893.6 -34.7 56588.6 56620.3 now 90N 90E 91.05 88.08 1893.9 -34.7 1893.6 56588.6 56620.3 now 90N 180E...
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