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发表于 2015-4-29 10:45:34
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- //
- // Copyright (C) 1000 - 9999 Somebody Anonymous
- // NO WARRANTY OR GUARANTEE
- //
- using System;
- namespace Navi
- {
- class EvilTransform
- {
- const double pi = 3.14159265358979324;
- //
- // Krasovsky 1940
- //
- // a = 6378245.0, 1/f = 298.3
- // b = a * (1 - f)
- // ee = (a^2 - b^2) / a^2;
- const double a = 6378245.0;
- const double ee = 0.00669342162296594323;
- //
- // World Geodetic System ==> Mars Geodetic System
- public static void transform(double wgLat, double wgLon, out double mgLat, out double mgLon)
- {
- if (outOfChina(wgLat, wgLon))
- {
- mgLat = wgLat;
- mgLon = wgLon;
- return;
- }
- double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
- double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
- double radLat = wgLat / 180.0 * pi;
- double magic = Math.Sin(radLat);
- magic = 1 - ee * magic * magic;
- double sqrtMagic = Math.Sqrt(magic);
- dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
- dLon = (dLon * 180.0) / (a / sqrtMagic * Math.Cos(radLat) * pi);
- mgLat = wgLat + dLat;
- mgLon = wgLon + dLon;
- }
- static bool outOfChina(double lat, double lon)
- {
- if (lon < 72.004 || lon > 137.8347)
- return true;
- if (lat < 0.8293 || lat > 55.8271)
- return true;
- return false;
- }
- static double transformLat(double x, double y)
- {
- double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.Sqrt(Math.Abs(x));
- ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;
- ret += (20.0 * Math.Sin(y * pi) + 40.0 * Math.Sin(y / 3.0 * pi)) * 2.0 / 3.0;
- ret += (160.0 * Math.Sin(y / 12.0 * pi) + 320 * Math.Sin(y * pi / 30.0)) * 2.0 / 3.0;
- return ret;
- }
- static double transformLon(double x, double y)
- {
- double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.Sqrt(Math.Abs(x));
- ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;
- ret += (20.0 * Math.Sin(x * pi) + 40.0 * Math.Sin(x / 3.0 * pi)) * 2.0 / 3.0;
- ret += (150.0 * Math.Sin(x / 12.0 * pi) + 300.0 * Math.Sin(x / 30.0 * pi)) * 2.0 / 3.0;
- return ret;
- }
- }
- }
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出处:https://on4wp7.codeplex.com/Sour ... 83#EvilTransform.cs |
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