root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / GridInterpolated.java @ 11076
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/*******************************************************************************
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GridWrapperInterpolated
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Copyright (C) Victor Olaya
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*******************************************************************************/
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package org.gvsig.raster.grid; |
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import org.gvsig.raster.buffer.BufferFactory; |
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import org.gvsig.raster.buffer.IQueryableRaster; |
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import org.gvsig.raster.buffer.RasterBuffer; |
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/**
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* A grid wrapper that performs interpolation to calculate
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* cell values. This should be used when the window extent
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* does not 'fit' into the structure (coordinates and cellsize)
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* of the grid.
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*
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* @author Victor Olaya
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*/
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public class GridInterpolated extends GridReader{ |
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public static final int INTERPOLATION_NearestNeighbour = IQueryableRaster.INTERPOLATION_NearestNeighbour; |
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public static final int INTERPOLATION_Bilinear = IQueryableRaster.INTERPOLATION_Bilinear; |
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public static final int INTERPOLATION_InverseDistance = IQueryableRaster.INTERPOLATION_InverseDistance; |
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public static final int INTERPOLATION_BicubicSpline = IQueryableRaster.INTERPOLATION_BicubicSpline; |
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public static final int INTERPOLATION_BSpline = IQueryableRaster.INTERPOLATION_BSpline; |
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double m_dXMin , m_dYMax; //coordinates of the layer, not the window |
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double m_dCellSize; //cellsize of the layer, not the window |
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int m_iInterpolationMethod = INTERPOLATION_BSpline;
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/**
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* Crea un objeto lector a partir de un buffer de datos y el extent de la extensi?n
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* completa y de la ventana accedida.
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* @param rb Buffer de datos
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* @param layerExtent extent de la capa completa
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* @param windowExtent Extent
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* @param bands N?mero de bandas del origen
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*/
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public GridInterpolated( RasterBuffer rb,
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GridExtent layerExtent, |
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GridExtent windowExtent, |
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int[] bands){ |
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super(rb, layerExtent, windowExtent, bands);
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m_dXMin = layerExtent.minX(); |
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m_dYMax = layerExtent.maxY(); |
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m_dCellSize = layerExtent.getCellSize(); |
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} |
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/**
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* Crea un objeto lector a partir de una fuente de datos y el extent de la extensi?n
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* completa y de la ventana accedida.
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* @param ds Fuente de datos
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* @param layerExtent extent de la capa completa
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* @param windowExtent Extent
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* @param bands N?mero de bandas del origen
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*/
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public GridInterpolated( BufferFactory ds,
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GridExtent layerExtent, |
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GridExtent windowExtent, |
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int[] bands){ |
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super(ds, layerExtent, windowExtent, bands);
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init(); |
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} |
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/**
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* Inicializaci?n de la fuente de datos y carga del buffer.
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*/
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private void init(){ |
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m_dXMin = dataSource.getExtent().minX(); |
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m_dYMax = dataSource.getExtent().maxY(); |
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m_dCellSize = dataSource.getXCellSize(); |
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dataSource.addDrawableBands(bands); |
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} |
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/**
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* Asigna el m?todo de interpolaci?n
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* @param iMethod
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*/
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public void setInterpolationMethod(int iMethod){ |
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m_iInterpolationMethod = iMethod; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsByte(int, int)
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*/
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public byte getCellValueAsByte(int x, int y) { |
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return (byte) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsShort(int, int)
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*/
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public short getCellValueAsShort(int x, int y) { |
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return (short) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsInt(int, int)
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*/
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public int getCellValueAsInt(int x, int y) { |
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return (int) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsFloat(int, int)
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*/
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public float getCellValueAsFloat(int x, int y) { |
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return (float) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsDouble(int, int)
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*/
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public double getCellValueAsDouble(int x, int y) { |
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return _getValueAt(x, y);
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} |
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private double _getValueAt(int x, int y){ |
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double dX = windowExtent.minX() + windowExtent.getCellSize() * (x + 0.5); |
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double dY = windowExtent.maxY() - windowExtent.getCellSize() * (y + 0.5); |
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return getValueAt(dX, dY);
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} |
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private double getValueAt(double xPosition, double yPosition){ |
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int x, y;
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double dx, dy;
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double dValue;
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x = (int) Math.floor(xPosition = (xPosition - m_dXMin) / m_dCellSize); |
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y = (int)Math.floor(yPosition = (m_dYMax - yPosition ) / m_dCellSize); |
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dValue = _getCellValueInLayerCoords(x,y); |
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if( !isNoDataValue(dValue) ){
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dx = xPosition - x; |
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dy = yPosition - y; |
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switch( m_iInterpolationMethod ){
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case INTERPOLATION_NearestNeighbour:
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dValue = _getValueNearestNeighbour (x, y, dx, dy); |
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break;
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case INTERPOLATION_Bilinear:
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dValue = _getValueBiLinear (x, y, dx, dy); |
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break;
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case INTERPOLATION_InverseDistance:
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dValue = _getValueInverseDistance(x, y, dx, dy); |
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break;
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case INTERPOLATION_BicubicSpline:
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dValue = _getValueBiCubicSpline (x, y, dx, dy); |
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break;
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case INTERPOLATION_BSpline:
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dValue = _getValueBSpline (x, y, dx, dy); |
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break;
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} |
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} |
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else{
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dValue = getNoDataValue(); |
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} |
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return dValue;
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} |
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private double _getValueNearestNeighbour(int x, int y, double dx, double dy){ |
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x += (int)(0.5 + dx); |
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y += (int)(0.5 + dy); |
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return _getCellValueInLayerCoords(x, y);
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} |
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private double _getValueBiLinear(int x, int y, double dx, double dy){ |
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double z = 0.0, n = 0.0, d; |
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double dValue;
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dValue = _getCellValueInLayerCoords(x, y); |
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if (!isNoDataValue(dValue)){
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d = (1.0 - dx) * (1.0 - dy); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y);
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if (!isNoDataValue(dValue)){
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d = (dx) * (1.0 - dy);
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x, y + 1);
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if (!isNoDataValue(dValue)){
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d = (1.0 - dx) * (dy);
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y + 1); |
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if (!isNoDataValue(dValue)){
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d = (dx) * (dy); |
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z += d * dValue; |
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n += d; |
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} |
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if( n > 0.0 ){ |
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return( z / n );
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} |
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return( getNoDataValue() );
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} |
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private double _getValueInverseDistance(int x, int y, double dx, double dy){ |
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double z = 0.0, n = 0.0, d; |
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double dValue;
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if( dx > 0.0 || dy > 0.0 ){ |
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dValue = _getCellValueInLayerCoords(x, y); |
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt(dx*dx + dy*dy); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y);
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt((1.0-dx)*(1.0-dx) + dy*dy); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x, y + 1);
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt(dx*dx + (1.0-dy)*(1.0-dy)); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y + 1); |
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt((1.0-dx)*(1.0-dx) + (1.0-dy)*(1.0-dy)); |
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z += d * dValue; |
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n += d; |
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} |
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if( n > 0.0 ){ |
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return( z / n );
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} |
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}else
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return( _getCellValueInLayerCoords(x, y) );
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return( getNoDataValue());
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} |
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private double _getValueBiCubicSpline(int x, int y, double dx, double dy){ |
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int i;
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double a0, a2, a3, b1, b2, b3, c[], z_xy[][]; |
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c = new double[4]; |
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z_xy = new double[4][4]; |
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if( _get4x4Submatrix(x, y, z_xy) ){
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for(i=0; i<4; i++){ |
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a0 = z_xy[0][i] - z_xy[1][i]; |
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a2 = z_xy[2][i] - z_xy[1][i]; |
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a3 = z_xy[3][i] - z_xy[1][i]; |
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b1 = -a0 / 3.0 + a2 - a3 / 6.0; |
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b2 = a0 / 2.0 + a2 / 2.0; |
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b3 = -a0 / 6.0 - a2 / 2.0 + a3 / 6.0; |
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c[i] = z_xy[1][i] + b1 * dx + b2 * dx*dx + b3 * dx*dx*dx;
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} |
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a0 = c[0] - c[1]; |
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a2 = c[2] - c[1]; |
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a3 = c[3] - c[1]; |
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b1 = -a0 / 3.0 + a2 - a3 / 6.0; |
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b2 = a0 / 2.0 + a2 / 2.0; |
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b3 = -a0 / 6.0 - a2 / 2.0 + a3 / 6.0; |
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return( c[1] + b1 * dy + b2 * dy*dy + b3 * dy*dy*dy ); |
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} |
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return( _getValueBiLinear(x, y, dx, dy) );
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} |
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private double _getValueBSpline(int x, int y, double dx, double dy){ |
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int i, ix, iy;
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double z, px, py, Rx[], Ry[], z_xy[][]; |
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Rx = new double[4]; |
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Ry = new double[4]; |
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z_xy = new double [4][4]; |
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if( _get4x4Submatrix(x, y, z_xy) ){
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for(i=0, px=-1.0-dx, py=-1.0-dy; i<4; i++, px++, py++){ |
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Rx[i] = 0.0;
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Ry[i] = 0.0;
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if( (z = px + 2.0) > 0.0 ) |
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Rx[i] += z*z*z; |
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if( (z = px + 1.0) > 0.0 ) |
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Rx[i] += -4.0 * z*z*z;
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if( (z = px + 0.0) > 0.0 ) |
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Rx[i] += 6.0 * z*z*z;
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if( (z = px - 1.0) > 0.0 ) |
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Rx[i] += -4.0 * z*z*z;
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if( (z = py + 2.0) > 0.0 ) |
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Ry[i] += z*z*z; |
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if( (z = py + 1.0) > 0.0 ) |
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Ry[i] += -4.0 * z*z*z;
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if( (z = py + 0.0) > 0.0 ) |
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Ry[i] += 6.0 * z*z*z;
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if( (z = py - 1.0) > 0.0 ) |
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Ry[i] += -4.0 * z*z*z;
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Rx[i] /= 6.0;
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Ry[i] /= 6.0;
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} |
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for(iy=0, z=0.0; iy<4; iy++){ |
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for(ix=0; ix<4; ix++){ |
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z += z_xy[ix][iy] * Rx[ix] * Ry[iy]; |
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} |
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} |
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return( z );
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} |
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return( _getValueBiLinear(x, y, dx, dy) );
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} |
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private boolean _get4x4Submatrix(int x, int y, double z_xy[][]){ |
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int ix, iy, px, py;
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double dValue;
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for(iy=0, py=y-1; iy<4; iy++, py++){ |
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for(ix=0, px=x-1; ix<4; ix++, px++){ |
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dValue = _getCellValueInLayerCoords(px, py); |
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if (isNoDataValue(dValue)){
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return false; |
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} |
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else{
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z_xy[ix][iy] = dValue; |
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} |
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} |
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} |
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return( true ); |
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} |
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private double _getCellValueInLayerCoords(int x, int y){ |
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int w = 0, h = 0; |
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int pX = 0, pY = 0; |
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if(dataSource != null){ |
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w = dataSource.getWidth(); |
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h = dataSource.getHeight(); |
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dataSource.setAreaOfInterest(x, y, 1, 1); |
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pX = 1;
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pY = 1;
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}else{
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w = rasterBuf.getWidth(); |
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h = rasterBuf.getHeight(); |
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pX = x; |
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pY = y; |
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} |
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if ( x >= 0 && y >= 0 && x < w && y < h){ |
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if (dataType == RasterBuffer.TYPE_DOUBLE) {
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return rasterBuf.getElemDouble(pY, pX, bandToOperate);
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} else if (dataType == RasterBuffer.TYPE_INT) { |
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return (double) rasterBuf.getElemInt(pY, pX, bandToOperate); |
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} else if (dataType == RasterBuffer.TYPE_FLOAT) { |
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return (double) rasterBuf.getElemFloat(pY, pX, bandToOperate); |
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} else if (dataType == RasterBuffer.TYPE_BYTE) { |
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return (double) rasterBuf.getElemByte(pY, pX, bandToOperate); |
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} else if ((dataType == RasterBuffer.TYPE_SHORT) | (dataType == RasterBuffer.TYPE_USHORT)) { |
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return (double) rasterBuf.getElemShort(pY, pX, bandToOperate); |
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} |
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} |
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return getNoDataValue();
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} |
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public byte[] getBandsValuesAsByte(int x, int y) { |
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//TODO: FUNCIONALIDAD: getBandsValuesAsByte:Obtener los valores interpolados en todas las bandas
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return null; |
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} |
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public short[] getBandsValuesAsShort(int x, int y) { |
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//TODO: FUNCIONALIDAD: getBandsValuesAsShort:Obtener los valores interpolados en todas las bandas
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return null; |
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} |
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public int[] getBandsValuesAsInt(int x, int y) { |
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//TODO: FUNCIONALIDAD: getBandsValuesAsInt:Obtener los valores interpolados en todas las bandas
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return null; |
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} |
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public float[] getBandsValuesAsFloat(int x, int y) { |
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//TODO: FUNCIONALIDAD: getBandsValuesAsFloat:Obtener los valores interpolados en todas las bandas
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return null; |
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} |
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public double[] getBandsValuesAsDouble(int x, int y) { |
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//TODO: FUNCIONALIDAD: getBandsValuesAsDouble:Obtener los valores interpolados en todas las bandas
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return null; |
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} |
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} |