On Fri, 15 Sep 2000 09:14:47 -0700, Jerry wrote:
>And what do "1 degree", "30 minute", "10 minute", and "5 minute" mean? 
>Can they be directly translated into feet/meters/kilometers?

That's the size of the square represented by the map.  1 degree of latitude
is about 70 miles or so.  1 degree of longitude depends on your latitude;
multiply 70 miles by the cosine of the latitude.  For most of the continental
US, a degree of longitude is about 50 miles, so a 1-degree map is about
50 miles wide by 70 miles tall.

30 minutes is half a degree, 10 minutes is one-sixth of a degree, and 
5 minutes is one-twelfth of a degree.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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