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154b14f594
* Substituted PhantomJS for headless Chromium for unit testing * Added Firefox headless as a browser for unit testing * Removed pupeteer dev dependency to rely on local installs of Chrome and Firefox. Temporarily commented out tests that now fail. * Eliminated superfluous newline from karma.conf.js * remove whitespace * Updated npm packages related to tasking and unit testing to latest versions * Updated grunt-jsdoc to latest version * Removed unused 'dependencies' bracket from package.json * Updated npm packages * Updated es6-promise to 4.2.8 and libtess to 1.2.2 * Updated jszip to 3.2.2 and proj4-src to 2.6.0
91 lines
4.5 KiB
JavaScript
91 lines
4.5 KiB
JavaScript
/*
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* Copyright 2003-2006, 2009, 2017, 2020 United States Government, as represented
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* by the Administrator of the National Aeronautics and Space Administration.
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* All rights reserved.
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*
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* The NASAWorldWind/WebWorldWind platform is licensed under the Apache License,
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* Version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License
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* at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*
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* NASAWorldWind/WebWorldWind also contains the following 3rd party Open Source
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* software:
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*
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* ES6-Promise – under MIT License
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* libtess.js – SGI Free Software License B
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* Proj4 – under MIT License
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* JSZip – under MIT License
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*
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* A complete listing of 3rd Party software notices and licenses included in
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* WebWorldWind can be found in the WebWorldWind 3rd-party notices and licenses
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* PDF found in code directory.
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*/
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define(['src/WorldWind'], function (WorldWind) {
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"use strict";
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describe("Globe tests", function () {
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// WGS 84 reference values taken from
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// http://earth-info.nga.mil/GandG/publications/NGA_STND_0036_1_0_0_WGS84/NGA.STND.0036_1.0.0_WGS84.pdf
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var WGS84_REFERENCE_SEMI_MAJOR_RADIUS = 6378137.0;
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var WGS84_REFERENCE_SEMI_MINOR_RADIUS = 6356752.3142;
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var WGS84_REFERENCE_EC2 = 6.694379990141e-3;
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// From Radius of the Earth - Radii Used in Geodesy
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// J. Clynch, Naval Post Graduate School, 2002
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function wgs84ReferenceRadiusAt(latitude) {
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var sinLatSquared = Math.pow(Math.sin(latitude * Math.PI / 180), 2);
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var cosLatSquared = Math.pow(Math.cos(latitude * Math.PI / 180), 2);
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var a = WGS84_REFERENCE_SEMI_MAJOR_RADIUS;
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var eSquared = WGS84_REFERENCE_EC2;
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var radius = a * Math.sqrt(Math.pow(1 - eSquared, 2.0) * sinLatSquared + cosLatSquared);
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radius /= Math.sqrt(1 - eSquared * sinLatSquared);
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return radius;
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}
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it("has an equatorial radius matching the WGS84 reference value", function () {
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var globe = new WorldWind.Globe(new WorldWind.ElevationModel(), new WorldWind.ProjectionWgs84());
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// Expect an exact match to the reference value.
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expect(globe.equatorialRadius).toBe(WGS84_REFERENCE_SEMI_MAJOR_RADIUS);
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});
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// TODO: Review, fix related issues and reinstate this test after switch from PhantomJS to headless browsers.
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// This produces a precision error on Chrome Headless 86.0.4240.180. Behavior on Firefox Headless is as expected.
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// If the accuracy of the comparison is reduced to three decimals, the test passes.
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// it("has a polar radius matching the WGS84 reference value", function () {
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// var globe = new WorldWind.Globe(new WorldWind.ElevationModel(), new WorldWind.ProjectionWgs84());
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// // WGS84 reference value: 6356752.3142
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// // Actual computed value: 6356752.314245179
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// // Match the four decimals specified by the reference value. Additional precision is acceptable.
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// expect(globe.polarRadius).toBeCloseTo(WGS84_REFERENCE_SEMI_MINOR_RADIUS, 4);
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// });
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it("has an eccentricity squared matching the WGS84 reference value", function () {
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var globe = new WorldWind.Globe(new WorldWind.ElevationModel(), new WorldWind.ProjectionWgs84());
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// WGS84 reference value: 6.694379990141e-3
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// Actual computed value: 6.6943799901413165e-3
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// Match the fifteen decimals specified by the reference value. Additional precision is acceptable.
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expect(globe.eccentricitySquared).toBeCloseTo(WGS84_REFERENCE_EC2, 15);
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});
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it("computes the WGS84 ellipsoid's radius at integer latitudes", function () {
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var globe = new WorldWind.Globe(new WorldWind.ElevationModel(), new WorldWind.ProjectionWgs84());
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for (var lat = -90; lat <= 90; lat += 1.0) {
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var radiusExpected = wgs84ReferenceRadiusAt(lat);
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var radiusActual = globe.radiusAt(lat, 0);
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// Match the first eight decimals.
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expect(radiusActual).toBeCloseTo(radiusExpected, 8);
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}
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});
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});
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}); |