通过计算进行GPS坐标代码,ObjC代码库,德仔网

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【ObjC】通过计算进行GPS坐标
作者:伯钊 / 发布于2014/11/17/ 746
通过计算进行GPS坐标、火星坐标与百度坐标间的转换。不需数据库和联网。

	//
	// TransformCorrdinate.h
	// TransformCorrdinateDemo
	//
	// Created by jimple on 14-1-13.
	// Copyright (c) 2014年 Jimple Chen. All rights reserved.
	//
	#import <Foundation/Foundation.h>
	#import <CoreLocation/CoreLocation.h>
	
	@interface TransformCorrdinate : NSObject
	
	// 百度坐标转谷歌坐标
	+ (void)transformatBDLat:(CGFloat)fBDLat BDLng:(CGFloat)fBDLng toGoogleLat:(CGFloat *)pfGoogleLat googleLng:(CGFloat *)pfGoogleLng;
	+ (CLLocationCoordinate2D)getGoogleLocFromBaiduLocLat:(CGFloat)fBaiduLat lng:(CGFloat)fBaiduLng;
	
	//// 谷歌坐标转百度坐标
	+ (CLLocationCoordinate2D)getBaiduLocFromGoogleLocLat:(CGFloat)fGoogleLat lng:(CGFloat)fGoogleLng;
	
	// GPS坐标转谷歌坐标
	+ (CLLocationCoordinate2D)GPSLocToGoogleLoc:(CLLocationCoordinate2D)objGPSLoc;
	
	
	@end
	
	
	
	//
	// TransformCorrdinate.m
	// TransformCorrdinateDemo
	//
	// Created by jimple on 14-1-13.
	// Copyright (c) 2014年 Jimple Chen. All rights reserved.
	//
	#import "TransformCorrdinate.h"
	
	@implementation TransformCorrdinate
	
	
	// 百度坐标转谷歌坐标
	const CGFloat x_pi = 3.14159265358979324 * 3000.0 / 180.0;
	+ (void)transformatBDLat:(CGFloat)fBDLat BDLng:(CGFloat)fBDLng toGoogleLat:(CGFloat *)pfGoogleLat googleLng:(CGFloat *)pfGoogleLng
	{
	 CGFloat x = fBDLng - 0.0065f, y = fBDLat - 0.006f;
	 CGFloat z = sqrt(x * x + y * y) - 0.00002f * sin(y * x_pi);
	 CGFloat theta = atan2(y, x) - 0.000003f * cos(x * x_pi);
	 *pfGoogleLng = z * cos(theta);
	 *pfGoogleLat = z * sin(theta);
	}
	
	+ (CLLocationCoordinate2D)getGoogleLocFromBaiduLocLat:(CGFloat)fBaiduLat lng:(CGFloat)fBaiduLng
	{
	 CGFloat fLat;
	 CGFloat fLng;
	
	 [[self class] transformatBDLat:fBaiduLat BDLng:fBaiduLng toGoogleLat:&fLat; googleLng:&fLng;];
	
	 CLLocationCoordinate2D objLoc;
	 objLoc.latitude = fLat;
	 objLoc.longitude = fLng;
	 return objLoc;
	}
	
	// 谷歌坐标转百度坐标
	+ (CLLocationCoordinate2D)getBaiduLocFromGoogleLocLat:(CGFloat)fGoogleLat lng:(CGFloat)fGoogleLng
	{
	 CLLocationCoordinate2D objLoc;
	
	 CGFloat x = fGoogleLng, y = fGoogleLat;
	 CGFloat z = sqrt(x * x + y * y) + 0.00002f * sin(y * x_pi);
	 CGFloat theta = atan2(y, x) + 0.000003f * cos(x * x_pi);
	 objLoc.longitude = z * cos(theta) + 0.0065;
	 objLoc.latitude = z * sin(theta) + 0.006;
	
	 return objLoc;
	}
	
	/******************* === GPS-Google BEGIN === *******************/
	/* 在网上看到的根据这个 c# 代码改的 GPS坐标转火星坐标 */
	/* https://on4wp7.codeplex.com/SourceControl/changeset/view/21483#353936 */
	/***************************************************************************/
	
	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;
	
	bool outOfChina(double lat, double lon);
	static double transformLat(double x, double y);
	static double transformLon(double x, double y);
	
	// World Geodetic System ==> Mars Geodetic System
	CLLocationCoordinate2D transformFromWGSCoord2MarsCoord(CLLocationCoordinate2D wgsCoordinate)
	{
	 double wgLat = wgsCoordinate.latitude;
	 double wgLon = wgsCoordinate.longitude;
	
	 if (outOfChina(wgLat, wgLon))
	 {
	 return wgsCoordinate;
	 }
	
	 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 = sin(radLat);
	 magic = 1 - ee * magic * magic;
	 double sqrtMagic = sqrt(magic);
	 dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
	 dLon = (dLon * 180.0) / (a / sqrtMagic * cos(radLat) * pi);
	
	 CLLocationCoordinate2D marsCoordinate = {wgLat + dLat, wgLon + dLon};
	 return marsCoordinate;
	}
	
	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;
	}
	
	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 * sqrt(abs(x));
	 ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;
	 ret += (20.0 * sin(y * pi) + 40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0;
	 ret += (160.0 * sin(y / 12.0 * pi) + 320 * sin(y * pi / 30.0)) * 2.0 / 3.0;
	 return ret;
	}
	
	double transformLon(double x, double y)
	{
	 double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(abs(x));
	 ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;
	 ret += (20.0 * sin(x * pi) + 40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0;
	 ret += (150.0 * sin(x / 12.0 * pi) + 300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0;
	 return ret;
	}
	/******************* === GPS-Google END === *******************/
	
	// GPS坐标转谷歌坐标
	+ (CLLocationCoordinate2D)GPSLocToGoogleLoc:(CLLocationCoordinate2D)objGPSLoc
	{
	 return transformFromWGSCoord2MarsCoord(objGPSLoc);
	}
	
	
	@end
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