民用導(dǎo)航設(shè)備衛(wèi)星數(shù)據(jù)格式轉(zhuǎn)化為GPS經(jīng)緯度數(shù)據(jù)

1、民用導(dǎo)航設(shè)備獲取的衛(wèi)星數(shù)據(jù)一般為NMEA協(xié)議源數(shù)據(jù)，它的經(jīng)緯度的數(shù)據(jù)是DDMM.MMMMMM（度分）格式
2、百度地圖或谷歌地圖的經(jīng)緯度的數(shù)據(jù)格式是DD.DDDDD
3、將DDMM.MMMMMM格式轉(zhuǎn)換DD.DDDDD格式

緯度數(shù)據(jù)轉(zhuǎn)換：

//測試數(shù)據(jù)： 廣州一民用導(dǎo)航設(shè)備衛(wèi)星數(shù)據(jù)（遵循NMEA-0183協(xié)議的民用設(shè)備導(dǎo)航衛(wèi)星數(shù)據(jù)）@{@"lat":@"2322.0897",@"lon":@"11315.3628",}

/**
 民用導(dǎo)航設(shè)備衛(wèi)星數(shù)據(jù)格式轉(zhuǎn)化為GPS緯度數(shù)據(jù)
 @param lon 衛(wèi)星數(shù)據(jù)
 @return GPS緯度數(shù)據(jù)
 */
- (double)latitudeFromSatelliteDataFormat:(NSString *)lat {
    if (lat.length <= 0) {// 若無數(shù)據(jù)返回天安門GPS緯度數(shù)據(jù)
        return 39.915119;
    }
    double lat_temp = 0;
    int lat_loc = 0;
    int dd_int = 0;
    long mm_int = 0;
    double lat_loc_double = 0;
    char *lat_str = (char *)[lat UTF8String]; //OC字符串轉(zhuǎn)化為C字符串
    lat_temp = atof(lat_str);  
    lat_loc =lat_temp*100000;   //轉(zhuǎn)換為整數(shù)
    dd_int = lat_loc/10000000;  //取出dd
    mm_int = lat_loc%10000000;  //取出MM部分
    lat_loc_double = dd_int + (double)mm_int/60/100000;//換算為Onenet格式
    return  lat_loc_double;
}

經(jīng)度數(shù)據(jù)轉(zhuǎn)換：

/**
 民用導(dǎo)航設(shè)備衛(wèi)星數(shù)據(jù)格式轉(zhuǎn)化為GPS經(jīng)度數(shù)據(jù)
 @param lon 衛(wèi)星數(shù)據(jù)
 @return GPS經(jīng)度數(shù)據(jù)
 */ 
- (double)longitudeFromSatelliteDataFormat:(NSString *)lon {
    if (lon.length <= 0) {// 若無數(shù)據(jù)返回天安門GPS經(jīng)度數(shù)據(jù)
        return 116.403963;
    }
    double lon_temp = 0;
    int lon_loc = 0;
    int dd_int = 0;
    long mm_int = 0;
    double lon_loc_double = 0;
    char *lon_str = (char *)[lon UTF8String]; //OC字符串轉(zhuǎn)化為C字符串
    lon_temp = atof(lon_str);  
    lon_loc =lon_temp*100000;   //轉(zhuǎn)換為整數(shù)
    dd_int = lon_loc/10000000;  //取出dd
    mm_int = lon_loc%10000000;  //取出MM部分
    lon_loc_double = dd_int + (double)mm_int/60/100000;//換算為Onenet格式
    return  lon_loc_double;
}