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Use rigorous Swiss grid / EPSG:4326 transforms

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This commit is contained in:
Tom Payne
2013-06-12 16:01:31 +02:00
parent 826556775c
commit 941432af75
2 changed files with 247 additions and 25 deletions
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60
test/spec/ol/proj/chprojection.test.js
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@@ -9,6 +9,17 @@ describe('ol.proj.CH', function() {
ol.proj.CH.add();
});
it('has the correct constants', function() {
expect(ol.proj.CH.ELLIPSOID.eSquared).to.roughlyEqual(
0.006674372230614, 1e-13);
expect(ol.proj.CH.R).to.roughlyEqual(6378815.90365, 1e-5);
expect(ol.proj.CH.ALPHA).to.roughlyEqual(1.00072913843038, 1e-14);
expect(ol.proj.CH.B0).to.roughlyEqual(
goog.math.toRadians((3600 * 46 + 60 * 54 + 27.83324844) / 3600),
1e-13);
expect(ol.proj.CH.K).to.roughlyEqual(0.0030667323772751, 1e-13);
});
it('can transform from EPSG:2056 to EPSG:21781', function() {
var output = ol.proj.transform(
[2660389.515487, 1185731.630396], 'EPSG:2056', 'EPSG:21781');
@@ -41,19 +52,24 @@ describe('ol.proj.EPSG2056', function() {
it('transforms from EPSG:2056 to EPSG:4326', function() {
var wgs84 = ol.proj.transform(
[2660389.515487, 1185731.630396], 'EPSG:2056', 'EPSG:4326');
[2679520.05, 1212273.44], 'EPSG:2056', 'EPSG:4326');
expect(wgs84).to.be.an(Array);
expect(wgs84).to.have.length(2);
expect(wgs84[0]).to.roughlyEqual(8.23, 1e-3);
expect(wgs84[1]).to.roughlyEqual(46.82, 1e-3);
expect(wgs84[0]).to.roughlyEqual(
(3600 * 8 + 60 * 29 + 11.111272) / 3600, 1e-8);
expect(wgs84[1]).to.roughlyEqual(
(3600 * 47 + 60 * 3 + 28.956592) / 3600, 1e-8);
});
it('transforms from EPSG:4326 to EPSG:2056', function() {
var ch1903 = ol.proj.transform([8.23, 46.82], 'EPSG:4326', 'EPSG:2056');
expect(ch1903).to.be.an(Array);
expect(ch1903).to.have.length(2);
expect(ch1903[0]).to.roughlyEqual(2660389.515487, 1);
expect(ch1903[1]).to.roughlyEqual(1185731.630396, 1);
var lv95 = ol.proj.transform([
(3600 * 8 + 60 * 29 + 11.11127154) / 3600,
(3600 * 47 + 60 * 3 + 28.95659233) / 3600
], 'EPSG:4326', 'EPSG:2056');
expect(lv95).to.be.an(Array);
expect(lv95).to.have.length(2);
expect(lv95[0]).to.roughlyEqual(2679520.05, 1e-3);
expect(lv95[1]).to.roughlyEqual(1212273.44, 1e-3);
});
});
@@ -69,7 +85,7 @@ describe('ol.proj.EPSG21781', function() {
expect(epsg21781).to.be.an(ol.Projection);
});
it('does not lose too much accuracy when round-tripping', function() {
it('maintains accuracy when round-tripping', function() {
var extent = epsg21781.getExtent();
var fromEPSG4326 = ol.proj.getTransform('EPSG:4326', 'EPSG:21781');
var toEPSG4326 = ol.proj.getTransform('EPSG:21781', 'EPSG:4326');
@@ -79,32 +95,38 @@ describe('ol.proj.EPSG21781', function() {
roundTripped = fromEPSG4326(toEPSG4326([x, y]));
expect(roundTripped).to.be.an(Array);
expect(roundTripped).to.have.length(2);
expect(roundTripped[0]).to.roughlyEqual(x, 1e1);
expect(roundTripped[1]).to.roughlyEqual(y, 1e1);
expect(roundTripped[0]).to.roughlyEqual(x, 1e-3);
expect(roundTripped[1]).to.roughlyEqual(y, 1e-3);
}
}
});
it('transforms from EPSG:21781 to EPSG:4326', function() {
var wgs84 = ol.proj.transform(
[660389.515487, 185731.630396], 'EPSG:21781', 'EPSG:4326');
[679520.05, 212273.44], 'EPSG:21781', 'EPSG:4326');
expect(wgs84).to.be.an(Array);
expect(wgs84).to.have.length(2);
expect(wgs84[0]).to.roughlyEqual(8.23, 1e-3);
expect(wgs84[1]).to.roughlyEqual(46.82, 1e-3);
expect(wgs84[0]).to.roughlyEqual(
(3600 * 8 + 60 * 29 + 11.111272) / 3600, 1e-8);
expect(wgs84[1]).to.roughlyEqual(
(3600 * 47 + 60 * 3 + 28.956592) / 3600, 1e-8);
});
it('transforms from EPSG:4326 to EPSG:21781', function() {
var ch1903 = ol.proj.transform([8.23, 46.82], 'EPSG:4326', 'EPSG:21781');
expect(ch1903).to.be.an(Array);
expect(ch1903).to.have.length(2);
expect(ch1903[0]).to.roughlyEqual(660389.515487, 1);
expect(ch1903[1]).to.roughlyEqual(185731.630396, 1);
var lv03 = ol.proj.transform([
(3600 * 8 + 60 * 29 + 11.11127154) / 3600,
(3600 * 47 + 60 * 3 + 28.95659233) / 3600
], 'EPSG:4326', 'EPSG:21781');
expect(lv03).to.be.an(Array);
expect(lv03).to.have.length(2);
expect(lv03[0]).to.roughlyEqual(679520.05, 1e-3);
expect(lv03[1]).to.roughlyEqual(212273.44, 1e-3);
});
});
goog.require('goog.math');
goog.require('ol.Projection');
goog.require('ol.proj');
goog.require('ol.proj.CH');