Package noaa.coastwatch.util

Class MixedGridResampler

java.lang.Object

noaa.coastwatch.util.GridResampler

noaa.coastwatch.util.MixedGridResampler

Direct Known Subclasses:

ACSPOMixedGridResampler

public class MixedGridResampler
extends GridResampler

The MixedGridResampler class performs generic data resampling between 2D earth transforms using a mix of forward and inverse resampling methods. The steps are as follows:

1. The source grid is divided into rectangles of a user-specified size.
2. For each rectangle in the source, a polynomial function is derived that maps from destination grid coordinates to source grid coordinates.
3. For each coordinate in each rectangle in the destination grid, a source coordinate is computed and data from the source grid transferred to the destination.

Since:

3.1.9

Author:

Peter Hollemans

Field Summary

Fields

Modifier and Type	Field	Description
static final int	OVERWRITE_ALWAYS	The always overwrite mode.
static final int	OVERWRITE_IF_CLOSER	The closer overwrite mode.
static final int	OVERWRITE_NEVER	The never overwrite mode.
protected int	overwriteMode	The overwrite mode.
protected int	rectHeight	The source coordinate rectangle height.
protected int	rectWidth	The source coordinate rectangle width.
protected LocationFilter	sourceFilter	The source location filter for pixel data.

Fields inherited from class noaa.coastwatch.util.GridResampler

destGrids, destTrans, sourceGrids, sourceTrans

Constructor Summary

Constructors

Constructor	Description
MixedGridResampler(EarthTransform sourceTrans, EarthTransform destTrans, int rectWidth, int rectHeight)	Creates a new grid resampler from the specified source and destination transforms.

Method Summary

Modifier and Type	Method	Description
void	perform(boolean verbose)	Performs the resampling operation on all source / destination pairs.
void	setOverwriteMode(int mode)	Sets the overwrite mode.
void	setSourceFilter(LocationFilter filter)	Sets the source location filter.

Methods inherited from class noaa.coastwatch.util.GridResampler

addGrid

Methods inherited from class java.lang.Object

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

Field Details

OVERWRITE_NEVER

public static final int OVERWRITE_NEVER

The never overwrite mode.

See Also:

• Constant Field Values

OVERWRITE_ALWAYS

public static final int OVERWRITE_ALWAYS

The always overwrite mode.

See Also:

• Constant Field Values

OVERWRITE_IF_CLOSER

public static final int OVERWRITE_IF_CLOSER

The closer overwrite mode.

See Also:

• Constant Field Values

rectWidth

protected int rectWidth

The source coordinate rectangle width.

rectHeight

protected int rectHeight

The source coordinate rectangle height.

overwriteMode

protected int overwriteMode

The overwrite mode.

sourceFilter

protected LocationFilter sourceFilter

The source location filter for pixel data.

Constructor Details

MixedGridResampler

public MixedGridResampler(EarthTransform sourceTrans,
 EarthTransform destTrans,
 int rectWidth,
 int rectHeight)

Creates a new grid resampler from the specified source and destination transforms.

Parameters:

sourceTrans - the source earth transform.

destTrans - the destination earth transform.

rectWidth - the source rectangle width.

rectHeight - the source rectangle height.

Method Details

setSourceFilter

public void setSourceFilter(LocationFilter filter)

Sets the source location filter. When set, the filter is used to determine if a source grid location should be used in the registration. By default, all source grid locations are used if they map to a destination location.

Parameters:

filter - the source location filter, or null for none.

setOverwriteMode

public void setOverwriteMode(int mode)

Sets the overwrite mode. If during the resampling, more than one source pixel is mapped to the same destination pixel, the overwrite mode is used to determine if the old value should be overwritten with the new value:

• OVERWRITE_NEVER - Keep the first data value and never overwrite it.
• OVERWRITE_ALWAYS - Always overwrite the data value with a new value. This is the default.
• OVERWRITE_IF_CLOSER - Only overwrite the data value if the new value is closer in physical location to the destination than the previous value.

Parameters:

mode - the new overwrite mode value.

perform

public void perform(boolean verbose)

Description copied from class: GridResampler

Performs the resampling operation on all source / destination pairs.

Specified by:

perform in class GridResampler

Parameters:

verbose - true for verbose resampling.