com.bbn.openmap.proj.coords
Class EnuFrame

java.lang.Object
  com.bbn.openmap.proj.coords.EnuFrame

public class EnuFrame
extends java.lang.Object

Encapsulates the ENU (East-North-Up) coordinate system.

I like the idea of hiding the detail of the transformation from the user. The user needs no detailed knowledge of mathematics and if we change the algorithm, nobody will be affected.

Author: Robert Hayes

Field Summary

protected float	x The x component of the coordinate (EAST).
protected float	y The y component of the coordinate (NORTH).
protected float	z The z component of the coordinate (UP).

Constructor Summary

EnuFrame()
Construct a default EnuFrame.

EnuFrame(double[] ecefv, LatLonPoint llpt)
Construct a EnuFrame from a ECEF vector and a LatLonPoint.

Method Summary

void	ecef2enu(double[] ecefVector, double latitude, double longitude, double[] enuVector) Internal conversion routine.
protected void	enu2ecef(double[] ecefVector, double latitude, double longitude, double[] enuVector) Internal conversion routine.
float	getX() Get x.
float	getY() Get Y.
float	getZ() Get Z.
void	setX(float pX) Set x.
void	setXYZ(float v1, float v2, float v3) Set x,y,z.
void	setY(float pY) Set y.
void	setZ(float pZ) Set z.
void	toDirectionVector(double degrees, double latitude, double longitude, double[] ecefVector) To get the direction as a vector.
double[]	toGeocentricFrame(LatLonPoint llpt) Convert to geocentric frame using a LatLonPoint.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

x

protected float x

The x component of the coordinate (EAST).

y

protected float y

The y component of the coordinate (NORTH).

z

protected float z

The z component of the coordinate (UP).

Constructor Detail

EnuFrame

public EnuFrame()

Construct a default EnuFrame. x,y,z are all set to zero.

EnuFrame

public EnuFrame(double[] ecefv,
                LatLonPoint llpt)

Construct a EnuFrame from a ECEF vector and a LatLonPoint.

Parameters:

llpt - LatLonPoint.

ecefv - representing an ecef vector.

Method Detail

toGeocentricFrame

public double[] toGeocentricFrame(LatLonPoint llpt)

Convert to geocentric frame using a LatLonPoint.

Parameters:

llpt -

Returns:

a double of ecef values

ecef2enu

public void ecef2enu(double[] ecefVector,
                     double latitude,
                     double longitude,
                     double[] enuVector)

Internal conversion routine.

Parameters:

ecefVector - vector

latitude - in radians.

longitude - in radians

enuVector - vector

enu2ecef

protected void enu2ecef(double[] ecefVector,
                        double latitude,
                        double longitude,
                        double[] enuVector)

Internal conversion routine.

Parameters:

ecefVector - vector

latitude - in radians.

longitude - in radians

enuVector - vector

setX

public void setX(float pX)

Set x.

Parameters:

pX - in meters.

setY

public void setY(float pY)

Set y.

Parameters:

pY - in meters.

setZ

public void setZ(float pZ)

Set z.

Parameters:

pZ - in meters.

setXYZ

public void setXYZ(float v1,
                   float v2,
                   float v3)

Set x,y,z.

Parameters:

v1 - East.

v2 - North.

v3 - Up.

getX

public float getX()

Get x.

Returns:

float x.

getY

public float getY()

Get Y.

Returns:

float y.

getZ

public float getZ()

Get Z.

Returns:

float z.

toDirectionVector

public void toDirectionVector(double degrees,
                              double latitude,
                              double longitude,
                              double[] ecefVector)

To get the direction as a vector.

Parameters:

degrees - is heading 0-360

latitude - in degrees.

longitude - in degrees.

ecefVector - vector