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IOS-WGS84 与百度坐标转换

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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