great-circle-apex v1.0.0

great-circle-apex

calculate the apex (point of minimum or maximum latitude) of a great circle arc

example

var gcApex = require('great-circle-apex')
var seattle = [-122.33,47.61]
var frankfurt = [8.68,50.12]

var p = gcApex([],seattle,frankfurt)
console.log(p) // [ -55.671430455011475, 70.11685763086712 ]

or if you only want the latitude, you can save some calculations:

var gcApexLat = require('great-circle-apex/latitude')
var seattle = [-122.33,47.61]
var frankfurt = [8.68,50.12]

var lat = gcApexLat(seattle,frankfurt)
console.log(lat) // 70.11685763086712

api

var gcApex = require('great-circle-apex')
var gcApexLat = require('great-circle-apex/latitude')

gcApex(out, A, B)

Calculate the apex of the great circle between points A and B, each of which are 2-element [lon,lat] arrays in decimal degrees, storing the result in out.

Returns out.

var latitude = gcApexLat(A, B)

Return the latitude of the apex of the great circle between points A and B without calculating the apex longitude.

install

npm install great-circle-apex

license

bsd