Graham,
This my distance calculation for what it's worth.
Function distance lat1, lon1, lat2, lon2, unit
-- Calculate Distance between to points
--
--lat1, lon1, lat2, lon2 are in deg.fractionalDegrees
-- Unit
-- if empty then miles
-- K = kilometers
-- N = nautical miles
local theta
local dist
Put lon1 - lon2 into theta
put Sin(deg2rad(lat1)) * Sin(deg2rad(lat2)) + Cos(deg2rad(lat1)) *
Cos(deg2rad(lat2)) * Cos(deg2rad(theta)) into dist
put Acos(dist) into dist
put rad2deg(dist) into dist
put dist * 60 * 1.1515 into dist
switch unit
case "K"
put dist * 1.609344 into dist
case "N"
put dist * 0.8684 into dist
end switch
Return dist
End distance
Function rad2deg rad
Return rad / PI * 180.0
end rad2deg
Ralph DiMola
IT Director
Evergreen Information Services
rdim...@evergreeninfo.net
-----Original Message-----
From: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] On Behalf Of
Graham Samuel via use-livecode
Sent: Friday, April 03, 2020 3:49 PM
To: How to use LiveCode
Cc: Graham Samuel
Subject: Re: Getting started with geographical coordinates
This is cheeky but I can’t run up my mobile simulation today - can someone tell
me the format of the geographical coordinates produced by mobileSensorReading
et al. I mean, is say latitude just one integer showing seconds, or is it deg,
min, sec - and are fractional seconds returned (so, floating point)? I shall
find out for myself eventually but it would help a little to know now. AFAIKS
there’s nothing in the LC documentation about it.
Graham
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