def distance(self, coord1, coord2):
"""Compute the distance using the great circle."""
sinsin_lat = coord1.lat.sin() * coord2.lat.sin()
coscos_lat = coord1.lat.cos() * coord2.lat.cos()
cos_deltalong = coord1.delta_long(coord2).cos()
angle = AngleDeg().acos(sinsin_lat + coscos_lat * cos_deltalong)
return angle.dist_from_radius(EARTH_RADIUS)
def test_degtorad(self): self.assertAlmostEqual(AngleDeg(180.0).rad, math.pi) self.assertAlmostEqual(AngleDeg(450.0).rad, (math.pi / 2))
#!/usr/bin/env python2.7
# Copyright (C) 2013 by Ken Guyton. All Rights Reserved.
"""Illustrate the basic usage of the geodist library."""
__author__ = 'Ken Guyton'
from kmg import geodist
from kmg.angle import AngleDeg
LAT1 = AngleDeg(37.61940)
LONG1 = AngleDeg(-122.37392)
LAT2 = AngleDeg(37.77677)
LONG2 = AngleDeg(-122.41673)
def main():
coord1 = geodist.Coordinate(LAT1, LONG1)
coord2 = geodist.Coordinate(LAT2, LONG2)
dist_obj = geodist.GeoDist()
distance = dist_obj.distance(coord1, coord2)
print '%.2f miles' % distance
if __name__ == '__main__':
main()
def test_equal(self): self.assertEqual(AngleDeg(30.0), AngleDeg(30.0)) self.assertEqual(AngleDeg(90.0), AngleDeg(90.0)) self.assertEqual(AngleDeg(198.0), AngleDeg(198.0))
def test_create(self): angle1 = AngleDeg() self.assertEqual(angle1.deg, 0.0) self.assertEqual(angle1.rad, 0.0)
def test_cos(self): self.assertAlmostEqual(AngleDeg(60.0).cos(), 0.5, delta=4) self.assertAlmostEqual(AngleDeg(0.0).cos(), 1.0, delta=4) self.assertAlmostEqual(AngleDeg(90.0).cos(), 0.0, delta=4)
def test_sin(self): self.assertAlmostEqual(AngleDeg(30.0).sin(), 0.5, delta=4) self.assertAlmostEqual(AngleDeg(90.0).sin(), 1.0, delta=4) self.assertAlmostEqual(AngleDeg(180.0).sin(), 0.0, delta=4)
def test_distfromradius(self):
"""For a radius convert the angle to a distance."""
test_angle = AngleDeg(10.0)
dist = test_angle.dist_from_radius(100.0)
self.assertAlmostEqual(dist, 17.4532, delta=4)
# Copyright (C) 2013 by Ken Guyton. All Rights Reserved. """Test the geodist module.""" __author__ = 'Ken Guyton' import math import unittest from kmg import geodist from kmg.angle import AngleRad from kmg.angle import AngleDeg # In miles. ONE_DEG_OF_LAT = 69.0933 # In degrees. TEST_LAT = AngleDeg(33.0) # In miles. PARALLEL_RADIUS = 3320.0910 ONE_DEG_OF_LONG = 57.9465 LAT1 = AngleDeg(33.77264) LONG1 = AngleDeg(-84.39290) LAT2 = AngleDeg(33.94979) LONG2 = AngleDeg(-83.37332) ONE_DEG = AngleDeg(1.0) # In miles. # From Google maps 59.8288 mi, delta = 25.87 ft.
#!/usr/bin/env python2.7
# Copyright (C) 2013 by Ken Guyton. All Rights Reserved.
"""Compute the distance from SFO to Twitter.
This is a test and example file for using geodist.
"""
__author__ = 'Ken Guyton'
from kmg import geodist
from kmg.angle import AngleDeg
SFO_LAT = AngleDeg(37.61940)
SFO_LONG = AngleDeg(-122.37392)
TW_LAT = AngleDeg(37.77677)
TW_LONG = AngleDeg(-122.41673)
# Distance measured with measurement tool on Google Maps.
GMAP_DIST = 11.1148
def report_error(orig_dist, a_dist):
"""Report the error given an actual dist."""
error = orig_dist - a_dist
error_ft = error * 5280.0
percent_err = error / orig_dist * 100.0
print 'Computed distance SFO to Twitter: %.4f miles.' % a_dist
print 'Original dist: %.4f miles.' % orig_dist