Re: [OpenMap Users] Rhumb line distance calculation

>>
>>There is Geo class and GreatCircle class. I don't understand fully what
>>those classes do and sometimes I find it difficult to choose which method to call.
>
>Geo does calculations based on the ellipsoid, GreatCircle does great circle computations based on a sphere. Geo has slightly different queries that you can make, too. In some ways, you can get an answer using either.

Yes, this is confusing. The intent was for Geo to be the source of geographic computation. Unfortunately, we can't deprecate GreatCircle because it does some computations that aren't in Geo yet.

>>I wonder if there is similar class for Rhumb line calculations.
>
>There isn't.

We haven't needed rhumb line distance before. Are you navigating by compass?

See:
http://www.ams.org/new-in-math/cover/navigation5.html for an explaination and an example.

Here's a Javascript page that will does the calcuation:
http://www.geocities.com/CapeCanaveral/2265/msail.htm

k

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