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社区首页 >问答首页 >CMAltimeter奇数数据

问CMAltimeter奇数数据
EN

Stack Overflow用户
提问于 2014-10-03 07:51:40
回答 3查看 565关注 0票数 0

我有一个从CMAltimeter startRelativeAltitudeUpdatesToQueue:块记录数据的应用程序。录音很好，但有些数据很奇怪。下面是我用来录制的非常简单的片段。

代码语言：javascript
复制
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);
        });
    }];

录音是在城市散步时完成的，我得到了一些奇数值。正如你所看到的，就像我从+7米到-225米自由落体一样。如文件中所述，高度相对于第一次高度记录为零。

你能解释一下我对CMAltimeter的理解是否有问题吗？还是这是个窃听器？

谢谢

代码语言：javascript
复制
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
ios
cmaltimeter
EN

回答 3

Stack Overflow用户

回答已采纳

发布于 2014-10-17 17:58:43

您的结果很可能是由于代码中的一个小错误造成的：

代码语言：javascript
复制
NSLog(@"Altitude: %f", altitudeData.relativeAltitude.floatValue);

应：

代码语言：javascript
复制
NSLog(@"Altitude: %f", altitudeData.relativeAltitude.doubleValue);

格式化程序‘'%f’需要一个双值。

票数 0
EN

Stack Overflow用户

发布于 2014-11-10 13:00:09

气压计计算气压变化的相对高度，因此天气的变化会使气压发生变化，从而改变相对高度。

票数 0
EN

Stack Overflow用户

发布于 2014-10-26 15:13:21

我的理解是%f期望浮动。%lf预期加倍

票数 -1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/26175222

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