EGM96 (NASA WorldWind)

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	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 Description

EGM96(java.lang.String offsetsFilePath)
Construct an instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

offsetsFilePath

protected java.lang.String offsetsFilePath

deltas
```
protected BufferWrapper deltas
```

INTERVAL
```
protected static Angle INTERVAL
```

NUM_ROWS
```
protected static int NUM_ROWS
```

NUM_COLS
```
protected static int NUM_COLS
```

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 - if there's a problem reading the file.

Method Detail

loadOffsetFile

protected void loadOffsetFile()
                       throws java.io.IOException

Throws:: java.io.IOException

getOffset

public double getOffset(Angle latitude,
                        Angle longitude)

gePostOffset

protected double gePostOffset(int row,
                              int col)