IOS-WGS84 与百度坐标转换

作者: 忘词_ | 来源:发表于2016-11-18 15:02 被阅读0次

今早搞了半天的百度地图，发现跟谷歌地图比起来各有优势吧，当初做谷歌的时候文档全是英文的尼玛所以百度地图相对还是比较简单。由于项目需要是WGS84的坐标百度地图SDK采用的是百度自有的地理坐标系（bdll09）但是百度没提供接口这就要我们手动撸码了。。。直接上代码

.h文件

#import<CoreLocation/CoreLocation.h>

/**

* 判断是否在中国

*/

+(BOOL)isLocationOutOfChina:(CLLocationCoordinate2D)location;

/**

* 将WGS-84转为GCJ-02(火星坐标):

*/

+(CLLocationCoordinate2D)transformFromWGSToGCJ:(CLLocationCoordinate2D)wgsLoc;

/**

* 将GCJ-02(火星坐标)转为百度坐标:

*/

+(CLLocationCoordinate2D)transformFromGCJToBaidu:(CLLocationCoordinate2D)p;

/**

* 将百度坐标转为GCJ-02(火星坐标):

*/

+(CLLocationCoordinate2D)transformFromBaiduToGCJ:(CLLocationCoordinate2D)p;

/**

* 将GCJ-02(火星坐标)转为WGS-84:

*/

+(CLLocationCoordinate2D)transformFromGCJToWGS:(CLLocationCoordinate2D)p;

.m文件以下是实现方法

首先包含

#import<math.h>

#import<UIKit/UIGeometry.h>

定义

static const double a = 6378245.0;

static const double ee = 0.00669342162296594323;

static const double pi = 3.14159265358979324;

static const double xPi = M_PI * 3000.0 / 180.0;

+(CLLocationCoordinate2D)transformFromWGSToGCJ:(CLLocationCoordinate2D)wgsLoc

{

CLLocationCoordinate2D adjustLoc;

double adjustLat = [self transformLatWithX:wgsLoc.longitude - 105.0 withY:wgsLoc.latitude - 35.0];

double adjustLon = [self transformLonWithX:wgsLoc.longitude - 105.0 withY:wgsLoc.latitude - 35.0];

long double radLat = wgsLoc.latitude / 180.0 * pi;

long double magic = sin(radLat);

magic = 1 - ee * magic * magic;

long double sqrtMagic = sqrt(magic);

adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);

adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * cos(radLat) * pi);

adjustLoc.latitude = wgsLoc.latitude + adjustLat;

adjustLoc.longitude = wgsLoc.longitude + adjustLon;

return adjustLoc;

}

+ (double)transformLatWithX:(double)x withY:(double)y

{

double lat = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * sqrt(fabs(x));

lat += (20.0 * sin(6.0 * x * pi) + 20.0 *sin(2.0 * x * pi)) * 2.0 / 3.0;

lat += (20.0 * sin(y * pi) + 40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0;

lat += (160.0 * sin(y / 12.0 * pi) + 320 * sin(y * pi / 30.0)) * 2.0 / 3.0;

return lat;

}

+ (double)transformLonWithX:(double)x withY:(double)y

{

double lon = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(fabs(x));

lon += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;

lon += (20.0 * sin(x * pi) + 40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0;

lon += (150.0 * sin(x / 12.0 * pi) + 300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0;

return lon;

}

+(CLLocationCoordinate2D)transformFromGCJToBaidu:(CLLocationCoordinate2D)p

{

long double z = sqrt(p.longitude * p.longitude + p.latitude * p.latitude) + 0.00002 * sin(p.latitude * xPi);

long double theta = atan2(p.latitude, p.longitude) + 0.000003 * cos(p.longitude * xPi);

CLLocationCoordinate2D geoPoint;

geoPoint.latitude = (z * sin(theta) + 0.006);

geoPoint.longitude = (z * cos(theta) + 0.0065);

return geoPoint;

}

+(CLLocationCoordinate2D)transformFromBaiduToGCJ:(CLLocationCoordinate2D)p

{

double x = p.longitude - 0.0065, y = p.latitude - 0.006;

double z = sqrt(x * x + y * y) - 0.00002 * sin(y * xPi);

double theta = atan2(y, x) - 0.000003 * cos(x * xPi);

CLLocationCoordinate2D geoPoint;

geoPoint.latitude = z * sin(theta);

geoPoint.longitude = z * cos(theta);

return geoPoint;

}

+(CLLocationCoordinate2D)transformFromGCJToWGS:(CLLocationCoordinate2D)p

{

double threshold = 0.00001;

// The boundary

double minLat = p.latitude - 0.5;

double maxLat = p.latitude + 0.5;

double minLng = p.longitude - 0.5;

double maxLng = p.longitude + 0.5;

double delta = 1;

int maxIteration = 30;

// Binary search

while(true)

{

CLLocationCoordinate2D leftBottom = [[self class] transformFromWGSToGCJ:(CLLocationCoordinate2D){.latitude = minLat,.longitude = minLng}];

CLLocationCoordinate2D rightBottom = [[self class] transformFromWGSToGCJ:(CLLocationCoordinate2D){.latitude = minLat,.longitude = maxLng}];

CLLocationCoordinate2D leftUp = [[self class] transformFromWGSToGCJ:(CLLocationCoordinate2D){.latitude = maxLat,.longitude = minLng}];

CLLocationCoordinate2D midPoint = [[self class] transformFromWGSToGCJ:(CLLocationCoordinate2D){.latitude = ((minLat + maxLat) / 2),.longitude = ((minLng + maxLng) / 2)}];

delta = fabs(midPoint.latitude - p.latitude) + fabs(midPoint.longitude - p.longitude);

if(maxIteration-- <= 0 || delta <= threshold)

{

return (CLLocationCoordinate2D){.latitude = ((minLat + maxLat) / 2),.longitude = ((minLng + maxLng) / 2)};

}

if(isContains(p, leftBottom, midPoint))

{

maxLat = (minLat + maxLat) / 2;

maxLng = (minLng + maxLng) / 2;

}

else if(isContains(p, rightBottom, midPoint))

{

maxLat = (minLat + maxLat) / 2;

minLng = (minLng + maxLng) / 2;

}

else if(isContains(p, leftUp, midPoint))

{

minLat = (minLat + maxLat) / 2;

maxLng = (minLng + maxLng) / 2;

}

else

{

minLat = (minLat + maxLat) / 2;

minLng = (minLng + maxLng) / 2;

}

static bool isContains(CLLocationCoordinate2D point, CLLocationCoordinate2D p1, CLLocationCoordinate2D p2)

{

return (point.latitude >= MIN(p1.latitude, p2.latitude) && point.latitude <= MAX(p1.latitude, p2.latitude)) && (point.longitude >= MIN(p1.longitude,p2.longitude) && point.longitude <= MAX(p1.longitude, p2.longitude));

}

/**

* 判断是不是在中国

* 用引射线法判断点是否在多边形内部

* 算法参考：http://www.cnblogs.com/luxiaoxun/p/3722358.html

*/

+ (BOOL)isLocationOutOfChina:(CLLocationCoordinate2D)location {

CGPoint point = CGPointMake(location.latitude, location.longitude);

BOOL oddFlag = NO;

NSInteger j = [self polygonOfChina].count - 1;

for (NSInteger i = 0; i < [self polygonOfChina].count; i++) {

CGPoint polygonPointi = [[self polygonOfChina][i] CGPointValue];

CGPoint polygonPointj = [[self polygonOfChina][j] CGPointValue];

if (((polygonPointi.y < point.y && polygonPointj.y >= point.y) ||

(polygonPointj.y < point.y && polygonPointi.y >= point.y)) &&

(polygonPointi.x <= point.x || polygonPointj.x <= point.x)) {

oddFlag ^= (polygonPointi.x +

(point.y - polygonPointi.y) /

(polygonPointj.y - polygonPointi.y) *

(polygonPointj.x - polygonPointi.x) <

point.x);

}

j = i;

}

return !oddFlag;

}

// 中国大陆多边形，用于判断坐标是否在中国

// 因为港澳台地区使用WGS坐标，所以多边形不包含港澳台地区

+ (NSMutableArray *)polygonOfChina {

static NSMutableArray *polygonOfChina = nil;

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

polygonOfChina = [[NSMutableArray alloc] init];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(49.1506690000,

87.4150810000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(48.3664501790,

85.7527085300)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(47.0253058185,

85.3847443554)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(45.2406550000,

82.5214000000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(44.8957121295,

79.9392351487)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(43.1166843846,

80.6751253982)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(41.8701690000,

79.6882160000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(39.2896190000,

73.6171080000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(34.2303430000,

78.9155300000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(31.0238860000,

79.0627080000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(27.9989800000,

88.7028920000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(27.1793590000,

88.9972480000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(28.0969170000,

89.7331400000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(26.9157800000,

92.1615830000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(28.1947640000,

96.0986050000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(27.4094760000,

98.6742270000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(23.9085500000,

97.5703890000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(24.0775830000,

98.7846100000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.1375640000,

99.1893510000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(21.1398950000,

101.7649720000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.2746220000,

101.7281780000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(23.2641940000,

105.3708430000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.7191200000,

106.6954480000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(21.9945711661,

106.7256731791)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(21.4847050000,

108.0200530000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(20.4478440000,

109.3814530000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(18.6689850000,

108.2408210000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(17.4017340000,

109.9333720000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(19.5085670000,

111.4051560000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(21.2716775175,

111.2514995205)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(21.9936323233,

113.4625292629)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.1818312942,

113.4258358111)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.2249729295,

113.5913115000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.4501912753,

113.8946844490)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.5959159322,

114.3623797842)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.4334610000,

114.5194740000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(22.9680954377,

116.8326939975)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(25.3788220000,

119.9667980000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(28.3261276204,

121.7724402562)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(31.9883610000,

123.8808230000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(39.8759700000,

124.4695370000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(41.7350890000,

126.9531720000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(41.5142160000,

128.3145720000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(42.9842081790,

131.0676468344)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(45.2690810000,

131.8468530000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(45.0608370000,

133.0610740000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(48.4480260000,

135.0111880000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(48.0054800000,

131.6628800000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(50.2270740000,

127.6890640000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(53.3516070000,

125.3710040000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(53.4176040000,

119.9254040000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(47.5590810000,

115.1421070000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(47.1339370000,

119.1159230000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(44.8256460000,

111.2786750000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(42.5293560000,

109.2549720000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(43.2598160000,

97.2967290000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(45.4247620000,

90.9680590000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(47.8075570000,

90.6737020000)]];

[polygonOfChina

addObject:[NSValue valueWithCGPoint:CGPointMake(49.1506690000,

87.4150810000)]];

});

return polygonOfChina;

}

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