ray-earth-intersection

find the intersection of an ECEF point in space with the wgs84 oblate sphereoid that approximates the earth

example

var intersect = require('ray-earth-intersection')
var ecef = require('geodetic-to-ecef')
 
var pt = ecef(64.50, -121.32, 5000)
var ray = [-0.1,-0.5,-1]
var ipt = intersect([], pt, ray)
if (!ipt) return console.log('no intersection')
 
console.log('point:        [', pt.join(', '), ']')
console.log('intersection: [', ipt.join(', '), ']')

output:

point:        [ -1432372.0459134346, -2353986.7031978564, 5738444.021020929 ]
intersection: [ -1433090.557842638, -2357579.2628438743, 5731258.901728894 ]

api

var intersect = require('ray-earth-intersection')

var res = intersect(out, point, ray)

Compute the nearest intersection between point, an array [x,y,z] in ECEF coordinates and the earth along ray, an array [x,y,z].

ray does not need to be normalized in this implementation.

When there is no intersection, res will be null.

The result is written to the 3-element array vector out and returned as res.

install

npm install ray-earth-intersection

license

BSD