Package uk.ac.rdg.resc.edal.util

Class LookUpTable

java.lang.Object

uk.ac.rdg.resc.edal.util.LookUpTable

public final class LookUpTable
extends Object

An object that provides an approximate means for mapping from longitude-latitude coordinates to i and j index coordinates in a curvilinear grid.

Author:

Guy Griffiths, Jon

Constructor Summary

Constructors

Constructor	Description
LookUpTable(CurvilinearCoords curvCoords, double minResolution)	Creates an empty look-up table (with all indices set to -1).

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
int[]	getGridCoordinates(double longitude, double latitude)	Returns the nearest coordinates in the original CurvilinearGrid to the given longitude-latitude point, or null if the given longitude-latitude point is not in the domain of this look-up table.
int	getNumLatPoints()	Gets the number of points in this look-up table along its latitude axis
int	getNumLonPoints()	Gets the number of points in this look-up table along its longitude axis
int	hashCode()

Methods inherited from class java.lang.Object

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

Constructor Detail

LookUpTable

public LookUpTable(CurvilinearCoords curvCoords,
                   double minResolution)

Creates an empty look-up table (with all indices set to -1).

Parameters:

curvCoords - The CurvilinearCoords which this LUT will approximate

minResolution - The minimum resolution of the LUT in degrees

Method Detail

getGridCoordinates

public int[] getGridCoordinates(double longitude,
                                double latitude)

Returns the nearest coordinates in the original CurvilinearGrid to the given longitude-latitude point, or null if the given longitude-latitude point is not in the domain of this look-up table.

Parameters:

longitude - The longitude of the point of interest

latitude - The latitude of the point of interest

Returns:

A newly-created integer array with two values: the first value is the i coordinate in the grid, the second is the j coordinate. Returns null if the given longitude-latitude point is not in the domain of this LUT.

getNumLonPoints

public int getNumLonPoints()

Gets the number of points in this look-up table along its longitude axis

getNumLatPoints

public int getNumLatPoints()

Gets the number of points in this look-up table along its latitude axis

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object