Manifold Community Site: Plotting great circles

RE: Plotting great circles

woneil — Sat, 23 Aug 2008 14:32:33 GMT

Is there a convenient and direct way to plot a great circle segment between two given points in Manifold? I recognize that I could calculate waypoints exterally and enter them as a table from which to plot a drawing line, or make a great circle drawing in a mapping program such as Versamap and import it, but I wonder whether Manifold offers a less cumbersome approach.

Will O'Neil

RE: Plotting great circles

geo — Sat, 23 Aug 2008 18:06:06 GMT

If I recall it correctly the azimuthal equidistant projection applied to spheres plots as straight lines all great circles passing through the projection central point .

RE: Plotting great circles

Lorne — Sun, 24 Aug 2008 02:43:10 GMT

There was a dicussion wrt to this topic awhile back which you might find interesting. See t64225.

RE: Plotting great circles

woneil — Sun, 24 Aug 2008 19:54:19 GMT

There was a dicussion wrt to this topic awhile back which you might find interesting.

Thanks for the reference. It seems to confirm that this is a need Manifold does not meet gracefully.

If I recall it correctly the azimuthal equidistant projection applied to spheres plots as straight lines all great circles passing through the projection central point

Indeed, this is characteristic of all azimuthial projections of the sphere.

Will O'Neil