Graham, I would want to be verifying the coordinates with another gps device. I’d also check it against apps that give lat/Lon.
Bill William Prothero https://earthlearningsolutions.org > On May 4, 2020, at 5:07 AM, Graham Samuel via use-livecode > <use-livecode@lists.runrev.com> wrote: > > I’m using GPS on iPhone using the various commands and functions available > in LC. Most of this works, but I am having difficulty with the quantity > “horizontal accuracy”. This can be queried via an array which is returned > when mobileCurrentLocation() is executed. > > Looking at other iOS apps that use GPS and allow one to examine their data, I > find that in my part of the world, accuracy for them is of the order of 5 > metres: but when I query it using LC I get much higher numbers, indeed some > of them look like nonsense, being hundreds of metres! > > I am aware that it takes time for a GPS signal to settle down after > mobileStartTrackingSensor “location” has been called, but even if I script > the examination of accuracy to wait for it to settle down (I look for a run > of similar or identical readings against a ‘reasonable’ criterion, such as 5 > metres), it still sometimes settles on very large numbers comparatively > speaking, for example it might stabilise at 65 metres. With that level of > inaccuracy any cumulative use, as in working out the number of kilometres in > a trip, would not be reliable. > > I wonder if my expectation is wrong, or if there is something different about > LC’s encapsulation of these iOS outputs, or if there is some other > explanation. > > In the short term, I’m simply going to have to relax my search for a > reasonable accuracy of the order of 5 metres, and just go for the first run > of stable readings. But I would love to hear any further insight from anyone > who’s already tried it. > > Graham > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
