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July 7th, 2010, 07:20 AM   #1
Joined: Jul 2010

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Longitude and latitude problem

Hi all,

*main question*:
I have earth point given in longitude and latitude for example (42,22) and I have a new point (42, x) and I have distance between that 2 points for example 20km.
I would like to calculate unknown x for the second point.

Can anybody help me with this?

Thanks to all
enser is offline  
July 13th, 2010, 11:15 AM   #2
Joined: Jun 2010

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Re: Longitude and latitude problem

let distance D=20km

the displacement is N-S, hence along a big circle, and D=r*da (length of arc with r=earth radius, da=angle difference)

then : if distance is in direction S : x=22-D/r, else x=22+D/r
jk22 is offline  
July 14th, 2010, 05:01 PM   #3
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Will the first value (42 in the above example) always be unchanged? You will need the angle in radians for the above method. How large can D be and how accurate do you want the values for x to be?
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