Having equator and meridians on map would be nice.Good evening, Great help in my research. Si j'ai une latitude ou une longitude en lecture au format NMEA standard, existe-t-il un moyen simple de convertir cette lecture en mètres, que je peux ensuite implémenter en Java (J9)?

Both latitude and longitude are measured in degrees, which are in turn divided into minutes and seconds. Enter the specific latitude. The distance then can be converted to any measure you want. You have to live with an approximate model of the earth, and project your coordinates onto it. For pole the formula gives 40075 * cos(90°) / 360 = 0 km.I think this approach is simple especially as the question didn't ask for the exact distance between two points, but rather if they are "reasonably close enough".With these formulas we easily check if the user is within a square centered on the waypoint.

Click on Calculate.
This is applicable for both a marine or aviation application, and the default is for "mid-latitude".

Also remark that 1° of longitude is almost always a different distance than 1° of latitude. For example, the tropical zone which is located to the south and to the north from the Equator is determined by the limits of 23°26'13.7'' S and 23°26'13.7'' N. Or. He asked, "How the HELL did you do that?". site design / logo © 2020 Stack Exchange Inc; user contributions licensed under
As for me, Elliptical Mercator seems very well. However, you will need to get the appropriate The earth is an annoyingly irregular surface, so there is no simple formula to do this exactly. The model I typically see used for this is NOAA has some software you can download to help with this There are quite a few ways to calculate this. In the code below I've left the raw numbers to show their relation to the formula from wikipedia.The wikipedia entry states that the distance calcs are within 0.6m for 100km longitudinally and 1cm for 100km latitudinally but I have not verified this as anywhere near that accuracy is fine for my use.Latitudes and longitudes specify points, not distances, so your question is somewhat nonsensical. !I drove a big time company exec for several years. with a latitude of 90 degrees you'd expect it to show near 111km; but instead it shows 0; similarly, values close to it are also near 0.Latitude is 0° at the equator and 90° at the pole (and not the opposite). Define "reasonable". Hope that more will come up. If its sufficiently close you can get away with treating them as coordinates on a flat plane. Thank you.Thank you, it all works fine now, thanks very much, such a useful site! I used this ALL the time. This script will calculate the length of one degree of both latitude and longitude, for a specific latitude.

Cet outil est dédié à la conversion de coordonnées GPS.Dès que vous modifiez un des champs de saisie, (soit dans les coordonnées décimales, soit dans les coordonnées sexagésimales), tous les autres champs sont automatiquement mis à jour, de même que la position du marqueur sur la carte. Thanks more powerYour web page was recommended by some colleagues as a powerful tool for my professional field, however after trying it several times, it gives me a "bot detected" message every single time.This app save me alot of time. I have been using your site since 2012! I work for a big firm and we really appreciate having this available. All of them use aproximations of spherical trigonometry where the radius is the one of the earth.To convert latitude and longitude in x and y representation you need to decide what type of map projection to use.

I will check out the link you sent, but I can't find any other site that gives us this info and it's so helpful. Are you looking for a way to compute the distance along the surface of the earth from one coordinate to another?Define "waypoint". This tool is incredibly useful but if I'm limited to 30 per day whats the point? There is not a single scaling between longitude and distance; the Earth is not flat.Note that one degree of longitude is 111 km at the equator, but less for other latitudes. This works on say, street or city level if perfect accuracy isnt required and all you need is a rough guess on the distance involved to compare with an arbitrary limit.

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