gov.nasa.worldwind.util

Class EGM96

java.lang.Object

gov.nasa.worldwind.util.EGM96

public class EGM96
extends java.lang.Object

Computes EGM96 geoid offsets.

A file with the offset grid must be passed to the constructor. This file must have 721 rows of 1440 2-byte integer values. Each row corresponding to a latitude, with the first row corresponding to +90 degrees (90 North). The integer values must be in centimeters.

Once constructed, the instance can be passed to EllipsoidalGlobe.applyEGMA96Offsets(String) to apply the offets to elevations produced by the globe.

Field Summary

Fields

Modifier and Type	Field and Description
protected BufferWrapper	deltas
protected static Angle	INTERVAL
protected static int	NUM_COLS
protected static int	NUM_ROWS
protected java.lang.String	offsetsFilePath

Constructor Summary

Constructors

Constructor and Description
EGM96(java.lang.String offsetsFilePath) Construct an instance.

Method Summary

Modifier and Type	Method and Description
protected double	gePostOffset(int row, int col)
double	getOffset(Angle latitude, Angle longitude)
protected void	loadOffsetFile()

Methods inherited from class java.lang.Object

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

Field Detail

deltas

protected BufferWrapper deltas

INTERVAL

protected static Angle INTERVAL

NUM_COLS

protected static int NUM_COLS

NUM_ROWS

protected static int NUM_ROWS

offsetsFilePath

protected java.lang.String offsetsFilePath

Constructor Detail

EGM96

public EGM96(java.lang.String offsetsFilePath)
      throws java.io.IOException

Construct an instance.

Parameters:

offsetsFilePath - a path pointing to a file with the geoid offsets. See the class description above for a description of the file.

Throws:

java.io.IOException - on error.

Method Detail

gePostOffset

protected double gePostOffset(int row,
                              int col)

getOffset

public double getOffset(Angle latitude,
                        Angle longitude)

loadOffsetFile

protected void loadOffsetFile()
                       throws java.io.IOException

Throws:

java.io.IOException