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add dLat/dLon <-> meters tests, narrower limits for distance tests.

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Bryan Housel
2014-06-23 17:12:02 -04:00
parent 2723c65506
commit e34e299fd0
1 changed files with 77 additions and 5 deletions
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82
test/spec/geo.js
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@@ -57,6 +57,78 @@ describe('iD.geo', function() {
});
});
describe('.latToMeters', function() {
it('0 degrees latitude is 0 meters', function() {
expect(iD.geo.latToMeters(0)).to.eql(0);
});
it('1 degree latitude is approx 111 km', function() {
expect(iD.geo.latToMeters(1)).to.be.within(110E3, 112E3);
});
it('-1 degree latitude is approx -111 km', function() {
expect(iD.geo.latToMeters(-1)).to.be.within(-112E3, -110E3);
});
});
describe('.lonToMeters', function() {
it('0 degrees longitude is 0 km', function() {
expect(iD.geo.lonToMeters(0, 0)).to.eql(0);
});
it('distance of 1 degree longitude varies with latitude', function() {
expect(iD.geo.lonToMeters(1, 0)).to.be.within(110E3, 112E3);
expect(iD.geo.lonToMeters(1, 15)).to.be.within(107E3, 108E3);
expect(iD.geo.lonToMeters(1, 30)).to.be.within(96E3, 97E3);
expect(iD.geo.lonToMeters(1, 45)).to.be.within(78E3, 79E3);
expect(iD.geo.lonToMeters(1, 60)).to.be.within(55E3, 56E3);
expect(iD.geo.lonToMeters(1, 75)).to.be.within(28E3, 29E3);
expect(iD.geo.lonToMeters(1, 90)).to.eql(0);
});
it('distance of -1 degree longitude varies with latitude', function() {
expect(iD.geo.lonToMeters(-1, 0)).to.be.within(-112E3, -110E3);
expect(iD.geo.lonToMeters(-1, -15)).to.be.within(-108E3, -107E3);
expect(iD.geo.lonToMeters(-1, -30)).to.be.within(-97E3, -96E3);
expect(iD.geo.lonToMeters(-1, -45)).to.be.within(-79E3, -78E3);
expect(iD.geo.lonToMeters(-1, -60)).to.be.within(-56E3, -55E3);
expect(iD.geo.lonToMeters(-1, -75)).to.be.within(-29E3, -28E3);
expect(iD.geo.lonToMeters(-1, -90)).to.eql(0);
});
});
describe('.metersToLat', function() {
it('0 meters is 0 degrees latitude', function() {
expect(iD.geo.metersToLat(0)).to.eql(0);
});
it('111 km is approx 1 degree latitude', function() {
expect(iD.geo.metersToLat(111E3)).to.be.within(0.995, 1.005);
});
it('-111 km is approx -1 degree latitude', function() {
expect(iD.geo.metersToLat(-111E3)).to.be.within(-1.005, -0.995);
});
});
describe('.metersToLon', function() {
it('0 meters is 0 degrees longitude', function() {
expect(iD.geo.metersToLon(0, 0)).to.eql(0);
});
it('distance of 1 degree longitude varies with latitude', function() {
expect(iD.geo.metersToLon(111320, 0)).to.be.within(0.995, 1.005);
expect(iD.geo.metersToLon(107551, 15)).to.be.within(0.995, 1.005);
expect(iD.geo.metersToLon(96486, 30)).to.be.within(0.995, 1.005);
expect(iD.geo.metersToLon(78847, 45)).to.be.within(0.995, 1.005);
expect(iD.geo.metersToLon(55800, 60)).to.be.within(0.995, 1.005);
expect(iD.geo.metersToLon(28902, 75)).to.be.within(0.995, 1.005);
expect(iD.geo.metersToLon(1, 90)).to.eql(0);
});
it('distance of -1 degree longitude varies with latitude', function() {
expect(iD.geo.metersToLon(-111320, 0)).to.be.within(-1.005, -0.995);
expect(iD.geo.metersToLon(-107551, 15)).to.be.within(-1.005, -0.995);
expect(iD.geo.metersToLon(-96486, 30)).to.be.within(-1.005, -0.995);
expect(iD.geo.metersToLon(-78847, 45)).to.be.within(-1.005, -0.995);
expect(iD.geo.metersToLon(-55800, 60)).to.be.within(-1.005, -0.995);
expect(iD.geo.metersToLon(-28902, 75)).to.be.within(-1.005, -0.995);
expect(iD.geo.metersToLon(-1, 90)).to.eql(0);
});
});
describe('.sphericalDistance', function() {
it('distance between two same points is zero', function() {
var a = [0, 0],
@@ -66,22 +138,22 @@ describe('iD.geo', function() {
it('a straight 1 degree line at the equator is aproximately 111 km', function() {
var a = [0, 0],
b = [1, 0];
expect(iD.geo.sphericalDistance(a, b)).to.be.within(100E3,120E3);
expect(iD.geo.sphericalDistance(a, b)).to.be.within(110E3, 112E3);
});
it('a pythagorean triangle is right', function() {
it('a pythagorean triangle is (nearly) right', function() {
var a = [0, 0],
b = [4, 3];
expect(iD.geo.sphericalDistance(a, b)).to.be.within(500E3,600E3);
expect(iD.geo.sphericalDistance(a, b)).to.be.within(555E3, 556E3);
});
it('east-west distances at high latitude are shorter', function() {
var a = [0, 60],
b = [1, 60];
expect(iD.geo.sphericalDistance(a, b)).to.be.within(50E3,60E3);
expect(iD.geo.sphericalDistance(a, b)).to.be.within(55E3, 56E3);
});
it('north-south distances at high latitude are not shorter', function() {
var a = [0, 60],
b = [0, 61];
expect(iD.geo.sphericalDistance(a, b)).to.be.within(100E3,120E3);
expect(iD.geo.sphericalDistance(a, b)).to.be.within(110E3, 112E3);
});
});