问题描述

我正在使用 GPS 计算两点之间的距离，即我使用 windows phone 作为卷尺，但是当我开始时，即使我站着不动，我也没有得到正确的值，实际上它给了我数百米

i am using GPS to calculate distance between two points i.e. i am using windows phone as a tape measure but when i start i dont get the correct value infact even if i am standing still it gives me hundreds of meter

这是我的代码

      myWatcher.StatusChanged += new EventHandler<GeoPositionStatusChangedEventArgs>(myWatcher_StatusChanged);
        myWatcher.PositionChanged += new EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>(myWatcher_PositionChanged);
        myWatcher.MovementThreshold = 1;   

void myWatcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
    {
        double tempf = e.Position.Location.Latitude;
        double temps = e.Position.Location.Longitude;
        if (count2 == 0)
        {
            FirstLocation = new GeoCoordinate(tempf, temps);
            count2++;
        }
        else
        {
             double distanceInMeter;
            GeoCoordinate currentLocation;
                currentLocation = new GeoCoordinate(tempf, temps);
                distanceInMeter = currentLocation.GetDistanceTo(FirstLocation);                   

                if (App.flag == 0)
                {
                    textBlock1.Text = distanceInMeter.ToString() + " m";
                    double distanceInCm = distanceInMeter * 100;
                    textBlock2.Text = distanceInCm .ToString() + " cm";
                }
                else if (App.flag == 1)
                {
                    double distanceInInch = distanceInMeter * 39.3701;
                    textBlock1.Text = distanceInInch.ToString() + " in";
                    double distanceInFoot = distanceInMeter * 3.28084;
                    textBlock2.Text = distanceInFoot.ToString() + " ft";
                }
        }

    }

推荐答案

到目前为止，准确性不是问题.我运行这个应用程序，当前位置的读数不断变化，而我将移动阈值设置为 1 意味着需要覆盖 1 米的距离才能调用 PositionChanged 事件，但即使我还在，读数也会不断变化

so far accuracy is not an issue. i run this app and the reading at current location changes continuously while i have set movementthreshold to 1 means 1 meter of distance needs to be covered to call PositionChanged event but reading keeps on changing even though i am still

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