CODEWITHSUNDEEP
java
lampardchelsea
lampardchelsea

Reputation: 11

I want to calculate distance in a gps

I am currently working on a gps project. I have read an xml file, I can print out the longitude and latitude bounds in the form of minLat, maxLat, minLon, maxLon. Way,Relation and Node properties like, id, user, uid, version, visible, changeset and timestamp . I can also print out the tag key and value and the reference. My problem now is that I want to calculate the distance between two points with the use of latitude and longitude, it is unclear to me on how do it and which of the properties that I printed out to console I really need to do it. So please I need some help!

Upvotes: 1

Views: 939

Answers (2)

Matt R. Wilson
Matt R. Wilson

Reputation: 7575

Calculate distance in meters when you know longitude and latitude in java

This one was marked as answered, and there is an example function.

Upvotes: 0

tskulbru
tskulbru

Reputation: 2346

You need to calculate this using the Haversine formula. Here is a snippet of a perl script which does exactly this, I'd suggest taking a look at it for some better explanation: http://jan.ucc.nau.edu/~cvm/latlon_formula.html

And here is a deeper explanation of the problem: http://www.movable-type.co.uk/scripts/latlong.html

Haversine formula:

 a = sin²(Δlat/2) + cos(lat1).cos(lat2).sin²(Δlong/2) 
 c = 2.atan2(√a, √(1−a)) 
 d = R.c

where R is earth’s radius (mean radius = 6,371km); note that angles need to be in radians to pass to trig functions!

(source is the link above)

Upvotes: 1

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