AreaCalculator (SNAP Engine API)

java.lang.Object
- org.esa.snap.core.util.AreaCalculator

```
public class AreaCalculator
extends Object
```
Calculates the size of an specified area in square meter. The size is computed considering the latitudinal area correction.

Constructor Summary

Constructors
Constructor Description

AreaCalculator(GeoCoding gc)
Initialise the calculator with an GeoCoding.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`calculatePixelSize(int x, int y)`	Calculates the size of the pixel specified by the given x,y coordinates.
`double`	`calculateRectangleSize(Rectangle2D rectangle)`	Calculates the size of the area of the rectangle specified.
`double`	`getEarthRadius()`	The earth radius used for the calculation

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AreaCalculator
```
public AreaCalculator(GeoCoding gc)
```
    Initialise the calculator with an GeoCoding. The earth radius ist retrieved from the ellipsoid from the underlying map crs of the geo-coding. If this is not possible a default mean earth radius us used.
    
    Parameters:
    
    gc - the geo-coding
- Method Detail
  - getEarthRadius
```
public double getEarthRadius()
```
    The earth radius used for the calculation
    
    Returns:
    
    the earth radius in meter
  - calculatePixelSize
```
public double calculatePixelSize(int x,
                                 int y)
```
    Calculates the size of the pixel specified by the given x,y coordinates. The unit of the size is always meter.
    
    Parameters:
    
    x - the x location of the pixel
    
    y - the y location of the pixel
    
    Returns:
    
    the size in square meters
  - calculateRectangleSize
```
public double calculateRectangleSize(Rectangle2D rectangle)
```
    Calculates the size of the area of the rectangle specified. The rectangle needs to be specified in geo-graphical latitude/longitude coordinates The unit of the size is always meter.
    
    Parameters:
    
    rectangle - rectangle of the area in latitude/longitude coordinates
    
    Returns:
    
    the size in square meters