iPhone核心位置：计算总高程损失/增益

问题描述

我想在记录核心位置数据结束时计算总高程损失和增益。我很难想到这个数学的数学。

I am wanting to calculate total elevation loss and gain at the end of recording Core Location data. I am having a hard time thinking of the math for this one.

如果我在600英尺处开始并且在跟踪期间我上下移动，我将如何计算我的海拔增益和损失？

Say if I started at 600 feet and I go up and down during the tracking, how would I calculate my elevation gain and loss?

想法？

推荐答案

如果你想要分别跟踪收益和损失，保留两个累积成员变量netElevationLoss和netElevationGain，两者都初始化为0.

If you wanted to track gain and loss separately, keep two cumulative member variables, netElevationLoss and netElevationGain, both initialized to 0.

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    if(oldLocation == nil)
        return;

    double elevationChange = oldLocation.altitude - newLocation.altitude;
    if (elevationChange < 0)
    {
        netElevationLoss += fabs(elevationChange);
    }
    else
    {
        netElevationGain += elevationChange;
    }
}

您还可以使用此方法跟踪总变化，因为

You could also track total change using this method since

netElevationChange = netElevationGain - netElevationLoss 

随时。

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