LookUpTableGrid (Environmental Data Abstraction Library 1.5.2 API)

java.lang.Object
- uk.ac.rdg.resc.edal.grid.AbstractTransformedGrid
- - uk.ac.rdg.resc.edal.grid.AbstractCurvilinearGrid
  - - uk.ac.rdg.resc.edal.grid.LookUpTableGrid

All Implemented Interfaces:

Serializable, DiscreteDomain<HorizontalPosition,GridCell2D>, DiscreteHorizontalDomain<GridCell2D>, Domain<HorizontalPosition>, HorizontalDomain, HorizontalGrid
```
public final class LookUpTableGrid
extends AbstractCurvilinearGrid
```
A HorizontalGrid that is created from a "curvilinear" coordinate system, i.e. one in which the latitude/longitude coordinates of each grid point are specified using two-dimensional coordinate axes, which explicitly give the lat/lon of each point in the horizontal plane. In these coordinate systems, finding the nearest grid point to a given lat/lon point is complex. Therefore we pre-calculate a "look-up table" of the nearest i-j indices to a set of lat-lon points. Coordinate conversions using such a look-up table are not precise but may suffice for many applications.

Author:

Guy Griffiths, Jon Blower

See Also:

Serialized Form

Field Summary
- Fields inherited from class uk.ac.rdg.resc.edal.grid.AbstractCurvilinearGrid
  curvCoords

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`clearCache()`
`boolean`	`equals(Object obj)`
`GridCoordinates2D`	`findIndexOf(HorizontalPosition position)`	Finds the index of the specified position within this domain
`static LookUpTableGrid`	`generate(Array2D<Number> lonVals, Array2D<Number> latVals)`	The passed-in coordSys must have 2D horizontal coordinate axes.
`int`	`hashCode()`

Methods inherited from class uk.ac.rdg.resc.edal.grid.AbstractCurvilinearGrid
contains, getBoundingBox, getDomainObjects, getGeographicBoundingBox, getXSize, getYSize, size, transformNativeHeadingToWgs84

Methods inherited from class uk.ac.rdg.resc.edal.grid.AbstractTransformedGrid
getCoordinateReferenceSystem

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

- Method Detail
  - generate
```
public static LookUpTableGrid generate(Array2D<Number> lonVals,
                                       Array2D<Number> latVals)
```
    The passed-in coordSys must have 2D horizontal coordinate axes.
  - clearCache
```
public static void clearCache()
```
  - findIndexOf
```
public GridCoordinates2D findIndexOf(HorizontalPosition position)
```
    Description copied from interface: HorizontalGrid
    
    Finds the index of the specified position within this domain
    
    Parameters:
    
    position - The position to find the index of
    
    Returns:
    
    A GridCoordinates2D object representing the index of the position within the domain, or null if the position is outside the domain.
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface HorizontalGrid
    
    Overrides:
    
    hashCode in class AbstractCurvilinearGrid
  - equals
```
public boolean equals(Object obj)
```
    Specified by:
    
    equals in interface HorizontalGrid
    
    Overrides:
    
    equals in class AbstractCurvilinearGrid