Objective-C 通过经纬度计算两点的距离及坐标系转换

通过经纬度计算两点的距离

-(double)distanceBetweenOrderBy:(double) latitude1 :(double) latitude2 :(double) longitude1 :(double) longitude2{
    
    CLLocation *curLocation = [[CLLocation alloc] initWithLatitude:latitude1 longitude:longitude1];
    
    CLLocation *otherLocation = [[CLLocation alloc] initWithLatitude:latitude2 longitude:longitude2];
    
    
    double  distance  = [curLocation distanceFromLocation:otherLocation];
    
    return  distance;
    
}

坐标系转换

iOS开发中三大坐标系：

地球坐标(WGS84) —— 国际标准，GPS标准从 GPS 设备中取出的原始数据。国际地图提供商一般此坐标系。
火星坐标(GCJ-02) —— 中国标准，是由中国国家测绘局制订的地理信息系统的坐标系统。它是一种对经纬度数据的加密算法，即加入随机的偏差。国内出版的各种地图系统（包括电子形式），出于国家安全考虑，必须至少采用GCJ-02对地理位置进行首次加密。
百度坐标(BD-09) —— 百度坐标，在GCJ02基础上，进行了BD-09二次加密措施，API支持从WGS/GCJ转换成百度坐标，不支持反转。

//  JZLocationConverter.h

#import 
#import 

@interface JZLocationConverter : NSObject

 /**
  *    @brief    世界标准地理坐标(WGS-84) 转换成 中国国测局地理坐标（GCJ-02）<火星坐标>
  *    ##只在中国大陆的范围的坐标有效，以外直接返回世界标准坐标
  *    @param     location     世界标准地理坐标(WGS-84)
  *    @return    中国国测局地理坐标（GCJ-02）<火星坐标>
  */
+ (CLLocationCoordinate2D)wgs84ToGcj02:(CLLocationCoordinate2D)location;

 /**
  *    @brief    中国国测局地理坐标（GCJ-02） 转换成 世界标准地理坐标（WGS-84）
  *    ##此接口有1－2米左右的误差，需要精确定位情景慎用
  *    @param     location     中国国测局地理坐标（GCJ-02）
  *    @return    世界标准地理坐标（WGS-84）
  */
+ (CLLocationCoordinate2D)gcj02ToWgs84:(CLLocationCoordinate2D)location;

 /**
  *    @brief    世界标准地理坐标(WGS-84) 转换成 百度地理坐标（BD-09)
  *    @param     location     世界标准地理坐标(WGS-84)
  *    @return    百度地理坐标（BD-09)
  */
+ (CLLocationCoordinate2D)wgs84ToBd09:(CLLocationCoordinate2D)location;

 /**
  *    @brief    中国国测局地理坐标（GCJ-02）<火星坐标> 转换成 百度地理坐标（BD-09)
  *    @param     location     中国国测局地理坐标（GCJ-02）<火星坐标>
  *    @return    百度地理坐标（BD-09)
  */
+ (CLLocationCoordinate2D)gcj02ToBd09:(CLLocationCoordinate2D)location;

 /**
  *    @brief    百度地理坐标（BD-09) 转换成 中国国测局地理坐标（GCJ-02）<火星坐标>
  *    @param     location     百度地理坐标（BD-09)
  *    @return    中国国测局地理坐标（GCJ-02）<火星坐标>
  */
+ (CLLocationCoordinate2D)bd09ToGcj02:(CLLocationCoordinate2D)location;

 /**
  *    @brief    百度地理坐标（BD-09) 转换成 世界标准地理坐标（WGS-84）
  *    ##此接口有1－2米左右的误差，需要精确定位情景慎用
  *    @param     location     百度地理坐标（BD-09)
  *    @return    世界标准地理坐标（WGS-84）
  */
 + (CLLocationCoordinate2D)bd09ToWgs84:(CLLocationCoordinate2D)location;

@end

//  JZLocationConverter.m

#import "JZLocationConverter.h"
#import 

#define LAT_OFFSET_0(x,y) -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * sqrt(fabs(x))
#define LAT_OFFSET_1 (20.0 * sin(6.0 * x * M_PI) + 20.0 * sin(2.0 * x * M_PI)) * 2.0 / 3.0
#define LAT_OFFSET_2 (20.0 * sin(y * M_PI) + 40.0 * sin(y / 3.0 * M_PI)) * 2.0 / 3.0
#define LAT_OFFSET_3 (160.0 * sin(y / 12.0 * M_PI) + 320 * sin(y * M_PI / 30.0)) * 2.0 / 3.0

#define LON_OFFSET_0(x,y) 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(fabs(x))
#define LON_OFFSET_1 (20.0 * sin(6.0 * x * M_PI) + 20.0 * sin(2.0 * x * M_PI)) * 2.0 / 3.0
#define LON_OFFSET_2 (20.0 * sin(x * M_PI) + 40.0 * sin(x / 3.0 * M_PI)) * 2.0 / 3.0
#define LON_OFFSET_3 (150.0 * sin(x / 12.0 * M_PI) + 300.0 * sin(x / 30.0 * M_PI)) * 2.0 / 3.0

#define RANGE_LON_MAX 137.8347
#define RANGE_LON_MIN 72.004
#define RANGE_LAT_MAX 55.8271
#define RANGE_LAT_MIN 0.8293

#define jzA 6378245.0
#define jzEE 0.00669342162296594323


@implementation JZLocationConverter

+ (double)transformLat:(double)x bdLon:(double)y
{
     double ret = LAT_OFFSET_0(x, y);
     ret += LAT_OFFSET_1;
     ret += LAT_OFFSET_2;
     ret += LAT_OFFSET_3;
     return ret;
 }

+ (double)transformLon:(double)x bdLon:(double)y
 {
     double ret = LON_OFFSET_0(x, y);
     ret += LON_OFFSET_1;
     ret += LON_OFFSET_2;
     ret += LON_OFFSET_3;
     return ret;
 }

+ (BOOL)outOfChina:(double)lat bdLon:(double)lon
 {
     if (lon < RANGE_LON_MIN || lon > RANGE_LON_MAX)
         return true;
     if (lat < RANGE_LAT_MIN || lat > RANGE_LAT_MAX)
         return true;
     return false;
 }

+ (CLLocationCoordinate2D)gcj02Encrypt:(double)ggLat bdLon:(double)ggLon
 {
     CLLocationCoordinate2D resPoint;
     double mgLat;
     double mgLon;
     if ([self outOfChina:ggLat bdLon:ggLon]) {
         resPoint.latitude = ggLat;
         resPoint.longitude = ggLon;
         return resPoint;
     }
     double dLat = [self transformLat:(ggLon - 105.0)bdLon:(ggLat - 35.0)];
     double dLon = [self transformLon:(ggLon - 105.0) bdLon:(ggLat - 35.0)];
     double radLat = ggLat / 180.0 * M_PI;
     double magic = sin(radLat);
     magic = 1 - jzEE * magic * magic;
     double sqrtMagic = sqrt(magic);
     dLat = (dLat * 180.0) / ((jzA * (1 - jzEE)) / (magic * sqrtMagic) * M_PI);
     dLon = (dLon * 180.0) / (jzA / sqrtMagic * cos(radLat) * M_PI);
     mgLat = ggLat + dLat;
     mgLon = ggLon + dLon;

     resPoint.latitude = mgLat;
     resPoint.longitude = mgLon;
     return resPoint;
 }

+ (CLLocationCoordinate2D)gcj02Decrypt:(double)gjLat gjLon:(double)gjLon {
     CLLocationCoordinate2D  gPt = [self gcj02Encrypt:gjLat bdLon:gjLon];
     double dLon = gPt.longitude - gjLon;
     double dLat = gPt.latitude - gjLat;
     CLLocationCoordinate2D pt;
     pt.latitude = gjLat - dLat;
     pt.longitude = gjLon - dLon;
     return pt;
 }

+ (CLLocationCoordinate2D)bd09Decrypt:(double)bdLat bdLon:(double)bdLon
 {
     CLLocationCoordinate2D gcjPt;
     double x = bdLon - 0.0065, y = bdLat - 0.006;
     double z = sqrt(x * x + y * y) - 0.00002 * sin(y * M_PI);
     double theta = atan2(y, x) - 0.000003 * cos(x * M_PI);
     gcjPt.longitude = z * cos(theta);
     gcjPt.latitude = z * sin(theta);
     return gcjPt;
 }

+(CLLocationCoordinate2D)bd09Encrypt:(double)ggLat bdLon:(double)ggLon
 {
     CLLocationCoordinate2D bdPt;
     double x = ggLon, y = ggLat;
     double z = sqrt(x * x + y * y) + 0.00002 * sin(y * M_PI);
     double theta = atan2(y, x) + 0.000003 * cos(x * M_PI);
     bdPt.longitude = z * cos(theta) + 0.0065;
     bdPt.latitude = z * sin(theta) + 0.006;
     return bdPt;
 }


+ (CLLocationCoordinate2D)wgs84ToGcj02:(CLLocationCoordinate2D)location
 {
     return [self gcj02Encrypt:location.latitude bdLon:location.longitude];
 }

+ (CLLocationCoordinate2D)gcj02ToWgs84:(CLLocationCoordinate2D)location
 {
     return [self gcj02Decrypt:location.latitude gjLon:location.longitude];
 }


+ (CLLocationCoordinate2D)wgs84ToBd09:(CLLocationCoordinate2D)location
 {
     CLLocationCoordinate2D gcj02Pt = [self gcj02Encrypt:location.latitude
                                                   bdLon:location.longitude];
     return [self bd09Encrypt:gcj02Pt.latitude bdLon:gcj02Pt.longitude] ;
 }

+ (CLLocationCoordinate2D)gcj02ToBd09:(CLLocationCoordinate2D)location
 {
     return  [self bd09Encrypt:location.latitude bdLon:location.longitude];
 }

+ (CLLocationCoordinate2D)bd09ToGcj02:(CLLocationCoordinate2D)location
 {
     return [self bd09Decrypt:location.latitude bdLon:location.longitude];
 }

+ (CLLocationCoordinate2D)bd09ToWgs84:(CLLocationCoordinate2D)location
 {
     CLLocationCoordinate2D gcj02 = [self bd09ToGcj02:location];
     return [self gcj02Decrypt:gcj02.latitude gjLon:gcj02.longitude];
 }
@end

Objective-C 通过经纬度计算两点的距离及坐标系转换

通过经纬度计算两点的距离

坐标系转换

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