org.esa.snap.core.util

Class AreaCalculator

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

Method Summary

Modifier and Type	Method and 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