ucar.nc2.dt.grid

Class GridCoordinate2D

java.lang.Object

ucar.nc2.dt.grid.GridCoordinate2D

public class GridCoordinate2D
extends Object

2D Coordinate System has lat(x,y) and lon(x,y). This class implements finding the index (i,j) from (lat, lon) coord. This is for "one-off" computation, not a systematic lookup table for all points in a pixel array. Hueristically searches the 2D space for the cell tha contains the point.

Since:

Jul 10, 2009

Author:

caron

Constructor Summary

Constructors

Constructor and Description
GridCoordinate2D(ucar.nc2.dataset.CoordinateAxis2D latCoord, ucar.nc2.dataset.CoordinateAxis2D lonCoord)

Method Summary

Modifier and Type	Method and Description
static void	doOne(GridCoordinate2D g2d, double wantLat, double wantLon)
boolean	findCoordElement(double wantLat, double wantLon, int[] rectIndex)
boolean	findCoordElementForce(double wantLat, double wantLon, int[] rectIndex)
boolean	findCoordElementNoForce(double wantLat, double wantLon, int[] rectIndex) Find the best index for the given lat,lon point.
static void	main(String[] args)
static void	test1()
static void	test2()
static void	test3()

Methods inherited from class java.lang.Object

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

Constructor Detail

GridCoordinate2D

public GridCoordinate2D(ucar.nc2.dataset.CoordinateAxis2D latCoord,
                        ucar.nc2.dataset.CoordinateAxis2D lonCoord)

Method Detail

findCoordElementForce

public boolean findCoordElementForce(double wantLat,
                                     double wantLon,
                                     int[] rectIndex)

findCoordElement

public boolean findCoordElement(double wantLat,
                                double wantLon,
                                int[] rectIndex)

findCoordElementNoForce

public boolean findCoordElementNoForce(double wantLat,
                                       double wantLon,
                                       int[] rectIndex)

Find the best index for the given lat,lon point.

Parameters:

wantLat - lat of point

wantLon - lon of point

rectIndex - return (row,col) index, or best guess here. may not be null

Returns:

false if not in the grid.

doOne

public static void doOne(GridCoordinate2D g2d,
                         double wantLat,
                         double wantLon)

test1

public static void test1()
                  throws IOException

Throws:

IOException

test2

public static void test2()
                  throws IOException

Throws:

IOException

test3

public static void test3()
                  throws IOException

Throws:

IOException

main

public static void main(String[] args)
                 throws IOException

Throws:

IOException