问题描述
寻找资源或算法来计算在导航应用如下:
如果我当前GPS位置为(0,0),我得走32度?以每小时15哩,我怎么能计算我的位置将在10秒是什么
如: GPSCoordinate predictedCoord = GPSCoordinate.FromLatLong(0 ,0).AddByMovement(32,15,TimeSpan.FromSeconds(10));
修改当前根据下面的答案代码:
公共GPSCoordinate AddMovementMilesPerHour(机车重联,双speedMph,时间跨度长)
{
双X = speedMph * System.Math.Sin(税号* PI / 180)* duration.TotalSeconds / 3600;
双Y = speedMph * System.Math.Cos(税号* PI / 180)* duration.TotalSeconds / 3600;
双newLat = this.Latitude + 180 / PI * Y / earthRadius;
双NEWLONG = this.Longitude + 180 / PI / System.Math.Sin(this.Latitude * PI / 180)* X / earthRadius;
返回GPSCoordinate.FromLatLong(newLat,NEWLONG);
}
下面是完整的参数答案
变量:
-
标题
:标题(从方位角0°即向后的角度,以度) -
速度
:速度(即规范速度矢量,以英里/小时) -
lat0
,lon0
:初始协调度 -
DTIME
:时间间隔从起始位置,以秒为单位 -
经纬度
,LON
:以度预测坐标 -
PI
:在 PI 的常数(3.14159 ...) -
保留时间
:在地球半径的英里的(6378137.0米这使得3964.037911746英里)
在一个(东,北)本地帧,时间间隔后的位置是:
X =速度*罪(税号* PI / 180)* DTIME / 3600;
:Y =速度* COS(税号* PI / 180)* DTIME / 3600;
(在英里坐标)
从那里,你可以计算在WGS84帧中的新位置(即经度和纬度):
经纬度= lat0 + 180 / PI * Y / RT;
LON = lon0 + 180 / PI /罪(lat0 * PI / 180)* X / RT;
编辑:修正的最后一行:*罪(PHI)到/罪(PHI)
Looking for resources or algorithm to calculate the following in a navigation app:
If my current GPS position is (0,0) and I'm heading 32 degrees at 15 miles per hour, how can I calculate what my position will be in 10 seconds?
i.e.: GPSCoordinate predictedCoord = GPSCoordinate.FromLatLong(0, 0).AddByMovement(32, 15, TimeSpan.FromSeconds(10));
Edit: Current code based on answer below:
public GPSCoordinate AddMovementMilesPerHour(double heading, double speedMph, TimeSpan duration)
{
double x = speedMph * System.Math.Sin(heading * pi / 180) * duration.TotalSeconds / 3600;
double y = speedMph * System.Math.Cos(heading * pi / 180) * duration.TotalSeconds / 3600;
double newLat = this.Latitude + 180 / pi * y / earthRadius;
double newLong = this.Longitude + 180 / pi / System.Math.Sin(this.Latitude * pi / 180) * x / earthRadius;
return GPSCoordinate.FromLatLong(newLat, newLong);
}
Here is the complete parametric answer :
variables :
heading
: heading (i.e. backwards angle from azimuth 0°, in degrees)speed
: velocity (i.e. norm of the speed vector, in miles/hour)lat0
,lon0
: initial coordinates in degreesdtime
: time interval from the start position, in secondslat
,lon
: predicted coordinates in degreespi
: the pi constant (3.14159...)Rt
: Earth radius in miles (6378137.0 meters which makes 3964.037911746 miles)
In an (East, North) local frame, the position after the time interval is :
x = speed * sin(heading*pi/180) * dtime / 3600;
y = speed * cos(heading*pi/180) * dtime / 3600;
(with coordinates in miles)
From there you can compute the new position in the WGS84 frame (i.e. latitude and longitude) :
lat = lat0 + 180 / pi * y / Rt;
lon = lon0 + 180 / pi / sin(lat0*pi/180) * x / Rt;
Edit : corrected the last line : *sin(phi) to /sin(phi)
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