Maybe something from this can help you:

http://www.google.it/search?hl=it&client=firefox-a&rls=org.mozilla:en-US:official&hs=KUY&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=calculate+distance+from+lat+lon&spell=1

Just using an estimated factor will for sure not give you reasonable results 
for distances.

armin


-------- Original-Nachricht --------
Datum: Tue, 6 Mar 2007 17:02:31 +1100
Von: Gabe <[EMAIL PROTECTED]>
An: "pmapper-users list" <[email protected]>
CC: 
Betreff: [pmapper-users] Measurement in DD mapunits

> Hi all
> 
> The map Im using is in digital degrees and I want to use the measure
> function returning kilometres.  When I was using pmapper 1.x I found I
> could fiddle with calcFact in measure.js and get a reasonable
> approximation.  Now I am using pmapper 2.x and it doesnt seem to work
> anymore.
> 
> Has anyone else got a need for this and (hopefully) solved it ?  I
> have some code written in vbscript (ugh) that calculates the great
> circle distances from DD points but I havent had time to adapt it yet.
> 
> Thanks in advance
> 
> Gabriel
> 
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