Android的：如何获得准确的海拔高度？ [英] Android: How to get accurate altitude?

问题描述

我需要得到高度利用GPS的精确测量只。

I need to get an accurate measurement of altitude using GPS only.

我试过Location.getAltitude（），但是这是非常不准确的。 有什么建议？

I tried Location.getAltitude(), but that is terribly inaccurate. Any advice?

推荐答案

有两个问题与使用智能手机/平板电脑的GPS海拔高度：

There are two issues with using altitude of a smartphone / tablet GPS:

1. 在海拔的WGS84参考椭球以上的高度。它不是地面水平以上或海平面的高度。下面是关于它的更多细节：<一href="http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=10915">http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=10915.这个误差可以被校正;这里是一本介绍如何做到这一点的手：<一href="http://www.unavco.org/edu_outreach/tutorial/geoidcorr.html">http://www.unavco.org/edu_outreach/tutorial/geoidcorr.html.该网站的文章链接到一个计算器，以获得大地水准面的修正;我不知道是否还有一个Web服务可用于该计算。
2. 的GPS海拔高度是非常不准确相对便宜的GPS接收机。这是上一篇文章： http://gpsinformation.net/main/altitude.htm 。一种方法来应对这种不精确的是过滤高度数据。我用了一个圆形阵列记住过去的几年（我用4）高度测量并计算平均值。这足以让垂直速度的一个相对准确的读数为我的申请。

1. The altitude is the altitude above the WGS84 reference ellipsoid. It is not the altitude above ground level or sea level. Here is more detail on that: http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=10915. This error can be corrected; here is a description how to do that by hand: http://www.unavco.org/edu_outreach/tutorial/geoidcorr.html. The web article links to a calculator to get the Geoid height for correction; I do not know if there is also a web service available for this computation.
2. The GPS altitude is terribly inaccurate for relatively cheap GPS receivers. Here is an article on that: http://gpsinformation.net/main/altitude.htm. One method to cope with this kind of inaccuracy is to filter the altitude data. I used a circular array data structure to remember the last few (I used 4) altitude readings and compute the average. This sufficed to get a relatively accurate reading of vertical speed for my application.

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