Does anyone here have the formula for calculating distance give two pairs of
Longitude/Latitude coordinates? Please share this with me if you would.

--
Greg

Convert the latitudes and longitudes to radians, observing that latitude is
positive in the northern hemisphere, and negative in the southern
hemisphere, and by convention among astronomers east longitude is positive
and west longitude is negative (why? No one knows).

Let's call one point the 'start point' and the other one the 'end point.

Let L be the start point latitude in radians, and D be the end point
latitude in radians.

Let LHA be the difference between the two longitudes, in radians.

Then the sine of the distance angle between the two points, measured from
the center of the earth, is:

sin(distance angle) = sin(L) * sin(D) + cos(L) * cos(D) * cos(LHA)

and the angle in radians of the distance angle is:

da = asin(distance angle).

Convert this angle to degrees.

On a theoretically spherical earth, an angle of one degree subtends 60
nautical miles. So multiply the distance angle in degrees by sixty, and you
have what's called the "Great Circle Distance" between the points in
nautical miles of 6000 feet. To convert to land miles, multiply by
6000/5280.

Regards,
Tom Dacon
Dacon Software Consulting


"DellaCroce" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Does anyone here have the formula for calculating distance give two pairs
of
> Longitude/Latitude coordinates? Please share this with me if you would.
>
> --
> Greg
>
>

WOW!! That is exactly what I needed! Thanks, Tom.

"Tom Dacon" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Convert the latitudes and longitudes to radians, observing that latitude
is
> positive in the northern hemisphere, and negative in the southern
> hemisphere, and by convention among astronomers east longitude is positive
> and west longitude is negative (why? No one knows).
>
> Let's call one point the 'start point' and the other one the 'end point.
>
> Let L be the start point latitude in radians, and D be the end point
> latitude in radians.
>
> Let LHA be the difference between the two longitudes, in radians.
>
> Then the sine of the distance angle between the two points, measured from
> the center of the earth, is:
>
> sin(distance angle) = sin(L) * sin(D) + cos(L) * cos(D) * cos(LHA)
>
> and the angle in radians of the distance angle is:
>
> da = asin(distance angle).
>
> Convert this angle to degrees.
>
> On a theoretically spherical earth, an angle of one degree subtends 60
> nautical miles. So multiply the distance angle in degrees by sixty, and
you
> have what's called the "Great Circle Distance" between the points in
> nautical miles of 6000 feet. To convert to land miles, multiply by
> 6000/5280.
>
> Regards,
> Tom Dacon
> Dacon Software Consulting
>
>
> "DellaCroce" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > Does anyone here have the formula for calculating distance give two
pairs
> of
> > Longitude/Latitude coordinates? Please share this with me if you would.
> >
> > --
> > Greg
> >
> >
>
>

Dim AdjLatDist, dif, xdist As Double

DegLatDist = 111.13295-0.55982*Cos(2*lat1)+0.00012*Cos(5*lat1)

dif = Abs(lon1 - lon2)

xdist = Acos(Sin(lat1)*Sin(lat2)+Cos(lat1)*Cos(lat2)*Cos(dif))

return xdist * (180/pi) * DegLatDist

' Result in KM - for mile multiply by .6214

Denis


DellaCroce wrote:
> Does anyone here have the formula for calculating distance give two pairs of
> Longitude/Latitude coordinates? Please share this with me if you would.
>

Google is just great isnt it ?

--

OHM ( Terry Burns )
. . . One-Handed-Man . . .

Time flies when you don't know what you're doing

"DellaCroce" <(E-Mail Removed)> wrote in message
news:%23V$(E-Mail Removed)...
> WOW!! That is exactly what I needed! Thanks, Tom.
>
> "Tom Dacon" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
> > Convert the latitudes and longitudes to radians, observing that latitude
> is
> > positive in the northern hemisphere, and negative in the southern
> > hemisphere, and by convention among astronomers east longitude is
positive
> > and west longitude is negative (why? No one knows).
> >
> > Let's call one point the 'start point' and the other one the 'end point.
> >
> > Let L be the start point latitude in radians, and D be the end point
> > latitude in radians.
> >
> > Let LHA be the difference between the two longitudes, in radians.
> >
> > Then the sine of the distance angle between the two points, measured
from
> > the center of the earth, is:
> >
> > sin(distance angle) = sin(L) * sin(D) + cos(L) * cos(D) * cos(LHA)
> >
> > and the angle in radians of the distance angle is:
> >
> > da = asin(distance angle).
> >
> > Convert this angle to degrees.
> >
> > On a theoretically spherical earth, an angle of one degree subtends 60
> > nautical miles. So multiply the distance angle in degrees by sixty, and
> you
> > have what's called the "Great Circle Distance" between the points in
> > nautical miles of 6000 feet. To convert to land miles, multiply by
> > 6000/5280.
> >
> > Regards,
> > Tom Dacon
> > Dacon Software Consulting
> >
> >
> > "DellaCroce" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > Does anyone here have the formula for calculating distance give two
> pairs
> > of
> > > Longitude/Latitude coordinates? Please share this with me if you
would.
> > >
> > > --
> > > Greg
> > >
> > >
> >
> >
>
>