ios - CMA高度计奇数数据

Question

我有一个应用程序记录来自 CMAltmeter startRelativeAltitudeUpdatesToQueue: 块的数据。记录很好，但有些数据很奇怪。这是我用于录制的非常简单的片段。

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[self.altitude startRelativeAltitudeUpdatesToQueue:queue withHandler:^(CMAltitudeData *altitudeData, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^ {
            NSLog(@"Altitude: %f", altitudeData.relativeAltitude.floatValue);
        });
    }];

录音是在城市中行走时完成的，我得到了一些奇怪的值。正如你所看到的，就像我从 +7 米自由落体下降到 -225 米一样。如文档中所述，高度是相对于第一个高度记录为零的。

如果我对 CMAltmeter 的工作原理的理解有问题，是否有人解释一下？或者这是一个错误？

谢谢

2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 9.252784729003906
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 9.252784729003906
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 8.666885375976562
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 7.081024169921875
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: -28.24831390380859
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -61.20027160644531
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -28.24831390380859
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -40.86483764648438
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -40.86483764648438
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -40.86483764648438
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -45.53067016601562
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -53.98106384277344
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -64.6231689453125
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -53.98106384277344
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -28.13791656494141
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -28.13791656494141
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -92.41580200195312
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -146.3153533935547
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -160.0170745849609
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -181.5329132080078
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -181.5329132080078
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -181.5329132080078
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -199.3322296142578
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -193.2239837646484
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -199.3322296142578
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -209.9459381103516
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -209.9459381103516
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -187.6910858154297
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -187.6910858154297
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -197.9417877197266
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -201.6117706298828
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -201.6117706298828
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -201.6117706298828
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -225.4467010498047
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -225.4467010498047
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -225.4467010498047
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -190.1396331787109
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -190.1396331787109
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -220.1163177490234
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -220.1163177490234
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -217.6054229736328
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -216.1069793701172
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -216.1069793701172
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -216.1069793701172
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -220.0596771240234
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -208.4894256591797
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -208.4894256591797
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -181.7436370849609
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -120.3368835449219
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -37.50768280029297
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -37.50768280029297
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -37.50768280029297
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -35.98821258544922
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -35.98821258544922
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -33.94368743896484
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -33.94368743896484
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -25.50093841552734
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -25.50093841552734
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -25.50093841552734
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: -51.27220153808594
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: -16.14826202392578
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 2.517410278320312
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 3.932975769042969
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 4.590446472167969
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 6.611000061035156
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 6.611000061035156
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 5.907508850097656

score 0 · Accepted Answer

您的结果很可能是由于代码中的一个小错误：

NSLog(@"Altitude: %f", altitudeData.relativeAltitude.floatValue);

应该：

NSLog(@"Altitude: %f", altitudeData.relativeAltitude.doubleValue);

格式化程序 '%f' 需要一个双精度值。

score 0 · Accepted Answer

气压计通过压力变化计算相对高度，因此天气变化会使压力发生变化，从而改变相对高度。

score -1 · Accepted Answer

-1

我的理解是 %f 期望浮动。%lf 期望双倍

于 2014-10-26T15:13:21.107 回答

ios - CMA高度计奇数数据

3 回答 3

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