org.genesys.worldclim

Class WorldClimUtil

java.lang.Object

org.genesys.worldclim.WorldClimUtil

public final class WorldClimUtil
extends Object

Constructor Summary

Constructors

Constructor and Description
WorldClimUtil()

Method Summary

Modifier and Type	Method and Description
static float	getFactor(String variableName) Gets the factor for Worldclim variable
static Long	getWorldclim25Tile(Number longitude, Number latitude) Gets the Worldclim.org compatible tile index.
static double[]	reverseWorldclim25Tile(Long tileIndex) Convert our tileIndex back to (latitude, longitude) pair
static Long	tileIndexToDataIndex(Long tileIndex) Worldclim data is available for entire longitude range (-180:180), but latitude range is limited (90:-60) (missing Antarctica).

Methods inherited from class java.lang.Object

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

Constructor Detail

WorldClimUtil

public WorldClimUtil()

Method Detail

getWorldclim25Tile

public static final Long getWorldclim25Tile(Number longitude,
                                            Number latitude)

Gets the Worldclim.org compatible tile index. Worldclim splits longitude into 8640 columns (360/8640 = 0.041666666666667 xDim). Using the same yDim it splits latitude into 4320 rows (180/4320 = yDim). Worldclim data is available for entire longitude range (-180:180), but latitude range is limited (90:-60) (missing Antarctica). This code generates a tile index on the 8640x4320 grid. Tile index 0 at row 0, col 0 is bottom left (South West -90,-180). The South West (-90,-180) has column index 0, row index 0 The North West (90,-180) corner has column index 0, row index 4320-1, tile index 4320-1. The North East (90,180) corner is at 8640x4320-1.

Parameters:

longitude - the longitude

latitude - the latitude

Returns:

the index for data in .bil

tileIndexToDataIndex

public static final Long tileIndexToDataIndex(Long tileIndex)

Worldclim data is available for entire longitude range (-180:180), but latitude range is limited (90:-60) (missing Antarctica). The .bil file has 8640 columns and 3600 rows, with north west (90,-180) at row 0, index 0. This function converts tile index generated by getWorldclim25Tile(Number, Number) to the data index by stripping the row indexes missing in the file.

Parameters:

tileIndex - tile index generated by getWorldclim25Tile(Number, Number)

Returns:

data index

getFactor

public static float getFactor(String variableName)

Gets the factor for Worldclim variable

Parameters:

variableName - the variable name

Returns:

the factor

reverseWorldclim25Tile

public static double[] reverseWorldclim25Tile(Long tileIndex)

Convert our tileIndex back to (latitude, longitude) pair

Parameters:

tileIndex - the tile index

Returns:

the double[] (latitude, longitude)