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centralize the earth radius

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Sven Czarnian
2022-10-25 08:27:49 +02:00
parent abe73cdd8b
commit 6378630027
1 changed files with 3 additions and 2 deletions
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5
src/math/wgs84.ts
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@@ -1,5 +1,7 @@
import { Angle } from './angle'; import { Angle } from './angle';
const EarthRadius = 6371000;
export class WGS84 { export class WGS84 {
/// @brief Calculates the Haversine distance /// @brief Calculates the Haversine distance
/// @param coordinate0 The first coordinate /// @param coordinate0 The first coordinate
@@ -13,13 +15,12 @@ export class WGS84 {
const lon0 = Angle.deg2rad(coordinate0.lon); const lon0 = Angle.deg2rad(coordinate0.lon);
const lat1 = Angle.deg2rad(coordinate1.lat); const lat1 = Angle.deg2rad(coordinate1.lat);
const lon1 = Angle.deg2rad(coordinate1.lon); const lon1 = Angle.deg2rad(coordinate1.lon);
const earthRadius = 6371000;
const a = const a =
0.5 - 0.5 -
Math.cos(lat1 - lat0) * 0.5 + Math.cos(lat1 - lat0) * 0.5 +
Math.cos(lat0) * Math.cos(lat1) * (1 - Math.cos(lon1 - lon0) * 0.5); Math.cos(lat0) * Math.cos(lat1) * (1 - Math.cos(lon1 - lon0) * 0.5);
return 2 * earthRadius * Math.asin(Math.sqrt(a)); return 2 * EarthRadius * Math.asin(Math.sqrt(a));
} }
} }