Jeff,

why spherical mercator? What is spherical mercator? A mercator

projection on the sphere?

- how about a (Lambert) azimuthal projection with projection center in

the circle center?

http://en.wikipedia.org/wiki/Lambert_azimuthal_equal-area_projectionBtw. if you have only 100mile.. that is not so much. So the question

rather is: What accuracy to you need? [1 m or 100m?] Unfortunately I

forgot how much distortion you would get for 100miles in UTM (which

depends of course on the latitude).

btw. a tip: along the touching meridian and in equator direction one

degree is approximately 111km (derived for a sphere of radius ?6373km?).

This relationship could be helpful for conversions.

stefan

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