I have several lat/long readings from a GPS device in excel.

I need to calculate the distance between points. How?

For Latitude, I'm thinking
Pi*7900/360*(lat1-lat2)

Longitude must need some sort of correction for latitude, not sure
how.

Once i get lat distance and long distance
sqrt(lat**2 +long**2)

I need to write this all into excel.

Extra credit question.
Is there some way to make this into a excel function so you just give
it the the two pairs of readings?

Karl

On Mon, 17 Dec 2012 18:43:52 -0500, Karl Townsend
wrote:

I have several lat/long readings from a GPS device in excel.

I need to calculate the distance between points. How?

For Latitude, I'm thinking
Pi*7900/360*(lat1-lat2)

Longitude must need some sort of correction for latitude, not sure
how.

Once i get lat distance and long distance
sqrt(lat**2 +long**2)

I need to write this all into excel.

Extra credit question.
Is there some way to make this into a excel function so you just give
it the the two pairs of readings?

Karl

I cheat by using the line drawing tool in Google Earth. Can also be
used to illustrate LOS between two points. (change line altitude
parameters) Very cool.

On Mon, 17 Dec 2012 18:43:52 -0500, Karl Townsend
wrote:

I have several lat/long readings from a GPS device in excel.

I need to calculate the distance between points. How?

For Latitude, I'm thinking
Pi*7900/360*(lat1-lat2)

Longitude must need some sort of correction for latitude, not sure
how.

Once i get lat distance and long distance
sqrt(lat**2 +long**2)

I need to write this all into excel.

Extra credit question.
Is there some way to make this into a excel function so you just give
it the the two pairs of readings?

Karl

Try http://www.movable-type.co.uk/scripts/latlong.html

--
Cheers,
John B.

On 12/17/2012 6:43 PM, Karl Townsend wrote:
I have several lat/long readings from a GPS device in excel.

I need to calculate the distance between points. How?

For Latitude, I'm thinking
Pi*7900/360*(lat1-lat2)

Longitude must need some sort of correction for latitude, not sure
how.

Once i get lat distance and long distance
sqrt(lat**2 +long**2)

I need to write this all into excel.

Extra credit question.
Is there some way to make this into a excel function so you just give
it the the two pairs of readings?

Karl


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On Dec 17, 4:43*pm, Karl Townsend
wrote:
I have several lat/long readings from a GPS device in excel.

I need to calculate the distance between points. How?

For Latitude, I'm thinking
Pi*7900/360*(lat1-lat2)

Longitude must need some sort of correction for latitude, not sure
how.

Once i get lat distance and long distance
sqrt(lat**2 +long**2)

I need to write this all into excel.

Extra credit question.
Is there some way to make this into a excel function so you just give
it the the two pairs of readings?

Karl

I've programmed this for checking distances between zip codes using a
converison table, there are three formulas depending on what you need
for accuracy. Acroos town, the difference between the formulas is
like less than a tenth of a mile, it's more significant at longer
distances.

El cheapo formula:
miles1 = Sqr((69.1 * (lat2 - lat1)) ^ 2 + (53# * (long2 - long1)) ^ 2)

Second best:
miles2 = Sqr((69.1 * (lat2 - lat1)) ^ 2 + (69.1 * (long2 - long1) *
Cos(lat1 / 57.3)) ^ 2)

What I use:
If lat1 lat2 And long1 long2 Then
X = (Sin(lat1 / 57.2958) * Sin(lat2 / 57.2958)) + (Cos(lat1 /
57.2958) * Cos(lat2 / 57.2958) * Cos(long2 / 57.2958 - long1 /
57.2958))
Y = Sqr(1 - X ^ 2)
miles3 = 3963# * Atn(Y / X)
Else
miles3 = 0
End If
Sensitive to where Lattitude and longitude are equal(same zip codes),
hence the check. Also runs a lot longer if you've got thousands of
entries to check.

From a tutorial out on the web from about 10 years back. HTH

Stan