Converting Latitude/Longitude (decimal degrees) to Bearing?

```Does someone have a formula to convert the lat and lon from two
locations (A and B) to bearings (location B relative to location A)?

```
 0
6/12/2007 8:53:03 PM
comp.soft-sys.sas 140146 articles. 1 followers.

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```Hi,

Here are some posts to get you started:

http://listserv.uga.edu/cgi-bin/wa?A2=ind0605D&L=sas-l&P=R6483

http://listserv.uga.edu/cgi-bin/wa?A2=ind0511C&L=sas-l&P=R32434

Mark Terjeson
Senior Programmer Analyst, IM&R
Russell Investments
253-439-2367

Russell

-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
anderson115@GMAIL.COM
Sent: Tuesday, June 12, 2007 1:53 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Converting Latitude/Longitude (decimal degrees) to Bearing?

Does someone have a formula to convert the lat and lon from two
locations (A and B) to bearings (location B relative to location A)?
```
 0
mterjeson (1913)
6/12/2007 9:01:05 PM
```Hi

Here's a little SAS example to calculate both the bearing and the
distance between two points.  It's a bit long-winded for illustration
purposes.  I got a lot of help from this web site:

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

There are two different distance calculation techniques used and either
works for me.  I don't claim to understand how any of this works; I just
have this in my SAS toolbox.  There are many online discussions out
there if you're interested.  It seems to depend on the degree of
accuracy you need.  And if you need distance in kilometers, change the
earth radius constant to kilometers (see the comment).

Hope this helps; the code follows.

Bob

data SAMPLE_TABLE1(keep=deg_lat1 deg_lon1 deg_lat2 deg_lon2 distance1
distance2
deg_bearing bearing_txt);
if _n_ = 1 then do;
/* Define Pi and the Radius of the Earth as constants */
Pi = constant('pi'); /* Use the SAS function to improve precision
*/
*      REarth = 6367;       /* Kilometers */
REarth = 3956.2704;  /* Miles */
end;
retain Pi REarth;

/* First point */
deg_lon1 = -81.2238;
deg_lat1 =  35.25927;

/* Second point */
deg_lon2 = -81.1492;
deg_lat2 =  35.22143;

/* First convert degrees to radians */
rad_lon1 = deg_lon1 * pi / 180;
rad_lat1 = deg_lat1 * pi / 180;
rad_lon2 = deg_lon2 * pi / 180;
rad_lat2 = deg_lat2 * pi / 180;

/* Law of Cosines for Spherical Trigonometry (uses radius) */
/* Haversine Formula (uses diameter) */
distance2 = (REarth * 2) * atan2(sqrt(A),sqrt(1-A));

/* Calculate bearing */

_lon2)), 2*Pi);

/* Convert bearing to degrees and create display variable as
degrees-minutes-seconds */
deg_Bearing = rad_Bearing * 180 / Pi;

Degrees = Int(abs(deg_Bearing));
Minutes = (abs(deg_Bearing) - Degrees) * 60;
Seconds = round((Minutes - Int(Minutes)) * 60);
Bearing_txt = put(degrees,3.) || 'B0'x || put(minutes,2.) || "'" ||
put(seconds,2.) || '"';
run;

-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
anderson115@GMAIL.COM
Sent: Tuesday, June 12, 2007 1:53 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Converting Latitude/Longitude (decimal degrees) to Bearing?

Does someone have a formula to convert the lat and lon from two
locations (A and B) to bearings (location B relative to location A)?
```
 0
BD9439 (92)
6/13/2007 9:28:40 PM

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Hi, Here are some posts to get you started: http://listserv.uga.edu/cgi-bin/wa?A2=ind0605D&L=sas-l&P=R6483 http://listserv.uga.edu/cgi-bin/wa?A2=ind0511C&L=sas-l&P=R32434 Mark Terjeson Senior Programmer Analyst, IM&R Russell Investments 253-439-2367 Russell Global Leaders in Multi-Manager Investing -----Original Message----- From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of anderson115@GMAIL.COM Sent: Tuesday, June 12, 2007 1:53 PM To: SAS-L@LISTSERV.UGA.EDU Subject: Converting Latitude/Longitude (decimal degrees) to Bearing? Does someone h...

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