Re: [mkgmap-dev] [PATCH v1] garmin_area() style function

Am 10.08.2013 13:21, schrieb WanMil:

I think results for lat=x° should equal lat=-x°?

This is what I would expect too. See attached ods-worksheet. $ro = 6371.0 //[km] $a = (90.0 - $lat1) * M_PI / 180.0; $b = (90.0 - $lat2) * M_PI / 180.0; $gamma = (abs($lon2 - $lon1)) * M_PI / 180.0; $c = $r0 * acos(cos($a)*cos($b) + sin($a)*sin($b)*cos($gamma)); //length [km] Henning