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Formula help

 
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# 1  
Old 03-27-2008
Data Formula help
The formula below will calculate a distance in miles between 2 points in excel. Can some put it to work in unix?

Lat = 43.335
Lon1 = -70.9884

Lat2 = 43.4829
Lon2 = -71.246

distance =3444*ACOS(COS(RADIANS(90-(Lat)))*COS(RADIANS(90-(Lat2)))+SIN(RADIANS(90-(Lat1)))*SIN(RADIANS(90-(Lat2)))*COS(RADIANS((Lon1-Lon2))))

distance = 14.3376283 miles
# 2  
Old 03-27-2008
Quote:
distance = 14.3376283 miles
I don't quite understand.

2 points in excel and the distance is in miles ... surprising Smilie
# 3  
Old 03-27-2008
not 2 points in excel. It's 2 points at different locations in a city. The result was done in excel spreadsheet.
# 4  
Old 03-27-2008
Tools Not sure of anything built-in to use
Take a look at >bc -l
Quote:
s() c() a()
They should all be defined as sine, cosine, arctan respectively

I will have to think more about radians.

And to the other question... latitude and longitude on a map. Math can determine the miles between points; complicated by the earth's curvature.
Last edited by joeyg; 03-27-2008 at 05:18 PM..
# 5  
Old 03-27-2008
HOME has a utility called gcb which you can download and install. It's probably more exact than your Excel formula, although the web page design (or lack of same) hints that usability might be nearly as bad as Excel.

If you're on Debian or Ubuntu, aptitude install gcb
# 6  
Old 03-27-2008
A quick detour via Google seems to suggest that the constant in the Excel formula is wrong, or at least debatable, it should be something like 3963 for miles, or 6378.8 for kilometers. Another source has 3959.98 for miles or 6372.797 for kilometers. Apparently, it (also) depends on how far from the equator you are.

See also Unit 014 - Latitude and Longitude
# 7  
Old 03-28-2008
Question
This formula will yield the distance between 2 coordinates.
Can this be done in UNIX?? Anyone knows how???

Lat1 = 43.335
Lon1 = -70.9884

Lat2 = 43.4829
Lon2 = -71.246

distance =3444*ACOS(COS(RADIANS(90-(Lat1)))*COS(RADIANS(90-(Lat2)))+SIN(RADIANS(90-(Lat1)))*SIN(RADIANS(90-(Lat2)))*COS(RADIANS((Lon1-Lon2))))

distance = 14.3376283 miles
 
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