org.geotools.process.vector

Class BilinearInterpolator

Object

BilinearInterpolator

public class BilinearInterpolator
extends Object

Interpolates a grid to a grid of different dimensions using bilinear interpolation.

NO_DATA cell values are supported in the source grid. There are two ways of handling the boundary between NO_DATA cells and data cells:

• Truncate - If any source cell is NO_DATA, the dest value is NO_DATA. This is simple and fast, but does make the data boundaries look a bit ragged.
• Smooth - If only one source cell is NO_DATA, the value is interpolated using the 3 valid values, across one-half of the interpolated cells. This smoothes off the boundary. If 2 or more source cells are NO_DATA, then Truncation is used.

Reference: http://en.wikipedia.org/wiki/Bilinear_interpolation.

Author:

Martin Davis - OpenGeo

Constructor Summary

Constructors

Constructor and Description
BilinearInterpolator(float[][] src) Creates a new interpolator on a given source grid.
BilinearInterpolator(float[][] src, float noDataValue) Creates a new interpolator on a given source grid.

Method Summary

Modifier and Type	Method and Description
float[][]	interpolate(int width, int height, boolean smoothBoundary) Interpolates the source grid to a new grid of different dimensions.

Methods inherited from class Object

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

Constructor Detail

BilinearInterpolator

public BilinearInterpolator(float[][] src)

Creates a new interpolator on a given source grid.

Parameters:

src - the source grid

BilinearInterpolator

public BilinearInterpolator(float[][] src,
                            float noDataValue)

Creates a new interpolator on a given source grid.

Parameters:

src - the source grid

noDataValue - the NO_DATA value (if none use Float.NaN)

Method Detail

interpolate

public float[][] interpolate(int width,
                             int height,
                             boolean smoothBoundary)

Interpolates the source grid to a new grid of different dimensions.

Parameters:

width - the width of the destination grid

height - the height of the destination grid

smoothBoundary - true if boundary smoothing should be performed

Returns:

the interpolated grid