root / trunk / libraries / libRaster / src / org / gvsig / raster / driver / datasetproperties / DatasetStatistics.java @ 10894
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2006 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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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*
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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.driver.datasetproperties; |
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import java.io.File; |
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import java.util.Date; |
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import java.util.Hashtable; |
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import org.gvsig.raster.driver.FileNotOpenException; |
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import org.gvsig.raster.driver.IBuffer; |
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import org.gvsig.raster.driver.IStatistics; |
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import org.gvsig.raster.driver.InvalidSetViewException; |
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import org.gvsig.raster.driver.RasterDataset; |
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import org.gvsig.raster.driver.RasterDriverException; |
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/**
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* Estadisticas asociadas a un fichero raster.
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*
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class DatasetStatistics implements IStatistics{ |
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/*
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* Esta a false si las estadisticas no son del fichero completo. Esto es posible porque podemos
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* tener unas estad?sticas calculadas a partir de una petici?n con subsampleo. Hay que tener en
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* cuenta que el raster puede ser muy grande y este calculo muy costoso.
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*/
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protected boolean complete = false; |
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protected double[] max = null; |
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protected double[] min = null; |
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protected double[] secondMax = null; |
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protected double[] secondMin = null; |
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protected double[] mean = null; |
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protected double[] variance = null; |
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protected String fName = null; |
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protected RasterDataset grf = null; |
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protected boolean calculated = false; |
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protected Hashtable tailTrim = new Hashtable(); |
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/**
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* Constructor. Asigna el fichero asociado.
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*/
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public DatasetStatistics(RasterDataset grf){
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this.grf = grf;
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} |
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/**
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* Asigna el valor m?ximo del grid
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* @return Valor m?ximo
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*/
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public void setMax(double[] max) { |
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this.max = max;
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} |
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/**
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* Asigna el valor del segundo m?ximo
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* @return Valor del segundo m?ximo
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*/
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public void setSecondMax(double[] smax) { |
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this.secondMax = smax;
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} |
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/**
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* Asigna el valor m?dio del grid
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* @return Valor medio
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*/
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public void setMean(double[] mean) { |
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this.mean = mean;
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} |
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/**
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* Asigna el valor m?ximo del grid
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* @return Valor m?nimo
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*/
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public void setMin(double[] min) { |
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this.min = min;
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} |
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/**
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* Asigna el valor del segundo m?nimo
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* @return Valor del segundo m?nimo
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*/
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public void setSecondMin(double[] smin) { |
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this.secondMin = smin;
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} |
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/**
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* Asigna la varianza
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* @return Varianza
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*/
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public void setVariance(double[] variance) { |
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this.variance = variance;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getMax()
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*/
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public double[] getMax() { |
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return max;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getSecondMax()
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*/
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public double[] getSecondMax() { |
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return secondMax;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getSecondMin()
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*/
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public double[] getSecondMin() { |
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return secondMin;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getMaximun()
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*/
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public double getMaximun(){ |
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double m = Double.MIN_VALUE; |
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for(int i = 0; i < max.length; i++) |
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m = Math.max(m, max[i]);
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return m;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getMinimun()
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*/
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public double getMinimun(){ |
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double m = Double.MAX_VALUE; |
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for(int i = 0; i < min.length; i++) |
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m = Math.min(m, min[i]);
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return m;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getMean()
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*/
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public double[] getMean() { |
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return mean;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getMin()
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*/
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public double[] getMin() { |
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return min;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getVariance()
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*/
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public double[] getVariance() { |
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return variance;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getBandCount()
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*/
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public int getBandCount(){ |
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return grf.getBandCount();
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#calcFullStatistics()
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*/
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public void calcFullStatistics() throws FileNotOpenException, RasterDriverException{ |
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long t2;
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long t1 = new Date().getTime(); |
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int type = grf.getDataType();
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max = new double[grf.getBandCount()]; |
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min = new double[grf.getBandCount()]; |
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secondMax = new double[grf.getBandCount()]; |
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secondMin = new double[grf.getBandCount()]; |
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mean = new double[grf.getBandCount()]; |
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variance = new double[grf.getBandCount()]; |
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int iValues = 0; |
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byte[] b = null;short[] s = null;int[] i = null;float[] f = null;double[] d = null; |
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for(int iBand = 0; iBand < grf.getBandCount(); iBand ++){ |
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iValues = 0;
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max[iBand] = Double.MIN_VALUE;
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min[iBand] = Double.MAX_VALUE;
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secondMax[iBand] = Double.MIN_VALUE;
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secondMin[iBand] = Double.MAX_VALUE;
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mean[iBand] = variance[iBand] = 0;
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for(int line = 0; line < grf.getHeight(); line ++){ |
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Object buf = null; |
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try {
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buf = grf.readCompleteLine(line, iBand); |
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} catch (InvalidSetViewException e) {
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//La vista se asigna autom?ticamente
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} |
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switch(type){
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case IBuffer.TYPE_BYTE: b = (byte[])buf;break; |
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case IBuffer.TYPE_SHORT: s = (short[])buf;break; |
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case IBuffer.TYPE_INT: i = (int[])buf;break; |
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case IBuffer.TYPE_FLOAT: f = (float[])buf;break; |
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case IBuffer.TYPE_DOUBLE: d = (double[])buf;break; |
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} |
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for(int col = 0; col < grf.getWidth(); col ++){ |
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double z = (b != null) ? (b[col] & 0xff) : ((s != null) ? (s[col] & 0xffff) : ((i != null) ? (i[col] & 0xffffff) : (f != null) ? f[col] : d[col])); |
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if(line == 0 && col == 0){ |
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min[iBand] = z; |
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secondMin[iBand] = z; |
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max[iBand] = z; |
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secondMax[iBand] = z; |
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continue;
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} |
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if( min[iBand] > z ){
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secondMin[iBand] = min[iBand]; |
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min[iBand] = z; |
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} |
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if( secondMin[iBand] == min[iBand] && min[iBand] < z)
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secondMin[iBand] = z; |
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if( max[iBand] < z ){
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secondMax[iBand] = max[iBand]; |
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max[iBand] = z; |
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} |
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if( secondMax[iBand] == max[iBand] && max[iBand] > z)
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secondMax[iBand] = z; |
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mean[iBand] += z; |
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variance[iBand] += z * z; |
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iValues++; |
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} |
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} |
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if( iValues > 0 ){ |
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mean[iBand] /= (double) iValues;
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variance[iBand] = variance[iBand] / (double) iValues - mean[iBand] * mean[iBand];
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} |
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} |
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calculated = true;
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t2 = new Date().getTime(); |
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System.out.println("Estadisticas " + grf.getFName() + ": " + ((t2 - t1) / 1000D) + ", secs."); |
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} |
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/**
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* Carga estadisticas desde el fichero Rmf si las hay.
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* @param fName Nombre del fichero
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*/
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public void loadFromRmf(){ |
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if(grf != null){ |
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File f = new File(grf.getFName()); |
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if(!f.exists())
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return;
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//calculated = true;
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//TODO: FUNCIONALIDAD: Carga de estad?sticas rmf
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} |
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} |
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/**
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* Salva estad?sticas a fichero rmf.
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* @param fName
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*/
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public void saveToRmf(){ |
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//TODO: FUNCIONALIDAD: Salvado de estad?sticas a rmf
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#isCalculated()
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*/
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public boolean isCalculated() { |
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return calculated;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#setTailTrimValue(double, java.lang.Object)
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*/
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public void setTailTrimValue(double percent, Object valueByBand){ |
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String s = new Double(percent).toString(); |
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tailTrim.put(s, valueByBand); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.driver.IStatistics#getTailTrimValue(double)
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*/
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public Object getTailTrimValue(double percent){ |
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String s = new Double(percent).toString(); |
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return tailTrim.get(s);
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} |
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/**
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* Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
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* bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
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*
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* <UL>
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* <LI>m?nimo</LI>
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* <LI>m?ximo</LI>
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* <LI>media</LI>
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* <LI>mediana</LI>
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* <LI>N?mero de pixels</LI>
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* </UL>
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* @param histogram
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* @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
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* estadistica para esa banda y si est? a false no se calcular?.
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* @return
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*/
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public static long[][] getBasicStatsFromHistogram(int[][] histogram, boolean[] bands){ |
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if(histogram == null) |
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return null; |
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return getBasicStatsFromHistogram(histogram, 0, histogram[0].length - 1, bands); |
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} |
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/**
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* Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
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* bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
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*
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* <UL>
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* <LI>m?nimo</LI>
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* <LI>m?ximo</LI>
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* <LI>media</LI>
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* <LI>mediana</LI>
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* <LI>N?mero de pixels</LI>
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* </UL>
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* @param histogram
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* @param beginPos Posici?n de inicio del histograma para contabilizar estadisticas
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* @param endPos Posici?n de fin del histograma para contabilizar estadisticas
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* @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
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* estadistica para esa banda y si est? a false no se calcular?.
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* @return
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*/
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public static long[][] getBasicStatsFromHistogram(int[][] histogram, int beginPos, int endPos, boolean[] bands){ |
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if(histogram == null) |
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return null; |
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//Contamos el n?mero de bandas para las cuales se calcula la estad?stica
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int bandCount = 0; |
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for(int iBand = 0; iBand < bands.length; iBand ++) |
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if(bands[iBand])
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bandCount ++; |
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int values = 5; |
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long[][] res = new long[values][]; |
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long[] min = new long[bandCount];//M?nimo |
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long[] max = new long[bandCount];//M?ximo |
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for(int iBand = 0; iBand < bandCount; iBand ++){ |
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max[iBand] = beginPos; |
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min[iBand] = endPos; |
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} |
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long[] average = new long[bandCount]; //Valor de pixel medio (Media) |
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long[] middle = new long[bandCount]; //Mediana |
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long[] nPixelsBand = new long[bandCount];//N?mero de pixels por banda |
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int showBandCounter = 0; //Contador de bandas de las que hay calcular la estadistica |
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for(int iBand = 0; iBand < histogram.length; iBand ++){ |
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if(bands[iBand]){
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int pixels = 0; //N?mero de valores por banda (entre 0 y 255) |
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for(int i = beginPos; i <= endPos; i ++){ |
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//Calculo del m?nimo
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if(histogram[iBand][i] != 0 && i < min[showBandCounter]) |
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min[showBandCounter] = i; |
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//Calculo del m?ximo
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if(histogram[iBand][i] != 0 && i > max[showBandCounter]) |
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max[showBandCounter] = i; |
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//Calculo del n?mero de pixeles
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nPixelsBand[showBandCounter] += (long)histogram[iBand][i];
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if(histogram[iBand][i] != 0) |
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pixels ++; |
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average[showBandCounter] += histogram[iBand][i] * i; |
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} |
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//Calculo de la media
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try{
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average[showBandCounter] /= nPixelsBand[showBandCounter]; |
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}catch(ArithmeticException exc){ |
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average[showBandCounter] = 0;
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} |
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//Calculo de mediana
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long middlePos = nPixelsBand[showBandCounter] >> 1; |
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int aux = 0; |
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int i = beginPos;
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for(i = beginPos; aux < middlePos; i++)
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aux += histogram[iBand][i]; |
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middle[showBandCounter] = i - 1;
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showBandCounter ++; |
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} |
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} |
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res[0] = min;
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res[1] = max;
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res[2] = average;
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res[3] = middle;
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res[4] = nPixelsBand;
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return res;
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} |
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} |