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

Sat Aug 10 14:23:47 BST 2013

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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: garmin_to_m.ods
Type: application/vnd.oasis.opendocument.spreadsheet
Size: 23498 bytes
Desc: not available
Url : http://lists.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20130810/b5d061d5/attachment-0001.ods 