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Mean Location
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Jim Geissman
Jun 5, 1994, 6:58:27 PM6/5/94
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We recently had a question about computing the mean center of several areas.
Well, what is the mean of several points on the surface of a (almost) sphere?
For instance a boundary condition: what is the mean of two points on the equator
180 degrees apart? In the center of the sphere? On the surface but 90 degrees
away (but in which direction?) ?
One supposes that GIS and spatial stats in general are more comfortable with
planes than spheres, but is this a real problem? Where does sphericity begin to
matter, and how does one tell?
Jim
Well, what is the mean of several points on the surface of a (almost) sphere?
For instance a boundary condition: what is the mean of two points on the equator
180 degrees apart? In the center of the sphere? On the surface but 90 degrees
away (but in which direction?) ?
One supposes that GIS and spatial stats in general are more comfortable with
planes than spheres, but is this a real problem? Where does sphericity begin to
matter, and how does one tell?
Jim
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