iOS气压计SeaLevel高度

Question

我正在为登山者制作一个iOS应用程序，以获得SeaLevel的高度，目前我被困在这里。我使用iOS气压计获取细节，但它只给出压力，相对高度和时间戳。有没有从海平面中计算出高度的方法？我用下面的方法来得到值。我用的是CMAltimeter

NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init];
formatter.maximumFractionDigits = 2;
formatter.minimumIntegerDigits = 1;

NSNumber *timestamp = [NSNumber numberWithDouble:altitudeData.timestamp];
NSString *timeInterval = [NSString stringWithFormat:@"%@", [formatter stringFromNumber:timestamp]];
NSString *altitude = [NSString stringWithFormat:@"%@", [formatter stringFromNumber:altitudeData.relativeAltitude]];
NSString *pressure = [NSString stringWithFormat:@"%@", [formatter stringFromNumber:altitudeData.pressure]];

self.label1.text = [NSString stringWithFormat:@"Time Interval: \n%@", timeInterval];
self.label2.text = [NSString stringWithFormat:@"Relative Altitude: \n%@", altitude];
self.label3.text = [NSString stringWithFormat:@"Air Pressure: \n%@", pressure];

Answer 1

请记住，这将只适用于iPhone 6及以上，因为只有他们在气压表内安装。你想要的公式叫做催眠公式。

P0 is sea-level pressure in hPa
P is atmospheric pressure in hPa
T is temperature in C
h is altitude in meters

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#include <math.h>
h = ((pow(p0/p,1/5.257)-1)*(t+273.15))/0.0065;