root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / GridStatistic.java @ 11200
History | View | Annotate | Download (2.93 KB)
| 1 |
/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
|
|---|---|
| 2 |
*
|
| 3 |
* Copyright (C) 2006 IVER T.I. and Generalitat Valenciana.
|
| 4 |
*
|
| 5 |
* This program is free software; you can redistribute it and/or
|
| 6 |
* modify it under the terms of the GNU General Public License
|
| 7 |
* as published by the Free Software Foundation; either version 2
|
| 8 |
* of the License, or (at your option) any later version.
|
| 9 |
*
|
| 10 |
* This program is distributed in the hope that it will be useful,
|
| 11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 13 |
* GNU General Public License for more details.
|
| 14 |
*
|
| 15 |
* You should have received a copy of the GNU General Public License
|
| 16 |
* along with this program; if not, write to the Free Software
|
| 17 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
|
| 18 |
*/
|
| 19 |
package org.gvsig.raster.grid; |
| 20 |
|
| 21 |
import org.gvsig.raster.buffer.RasterBufferInvalidAccessException; |
| 22 |
|
| 23 |
|
| 24 |
/**
|
| 25 |
* Estadisticas de un grid
|
| 26 |
* @author Victor Olaya (volaya@ya.com)
|
| 27 |
* @author Nacho Brodin (nachobrodin@gmail.com)
|
| 28 |
*/
|
| 29 |
public class GridStatistic { |
| 30 |
private double max; |
| 31 |
private double min; |
| 32 |
private double mean; |
| 33 |
private double variance; |
| 34 |
private boolean statisticsCalculated = false; |
| 35 |
private Grid grid = null; |
| 36 |
|
| 37 |
public GridStatistic(Grid grid){
|
| 38 |
this.grid = grid;
|
| 39 |
} |
| 40 |
|
| 41 |
public void calculateStatistics() throws RasterBufferInvalidAccessException{ |
| 42 |
int x, y;
|
| 43 |
double z;
|
| 44 |
int iValues;
|
| 45 |
|
| 46 |
mean = 0.0;
|
| 47 |
variance = 0.0;
|
| 48 |
iValues = 0;
|
| 49 |
|
| 50 |
statisticsCalculated = true;
|
| 51 |
|
| 52 |
for (y = 0; y < grid.getNY(); y++){ |
| 53 |
for (x = 0; x < grid.getNX(); x++){ |
| 54 |
z = grid.getCellValueAsDouble(x,y); |
| 55 |
if( !grid.isNoDataValue(z)) {
|
| 56 |
if( iValues == 0 ) |
| 57 |
min = max = z; |
| 58 |
else if( min > z ) |
| 59 |
min = z; |
| 60 |
else if( max < z ) |
| 61 |
max = z; |
| 62 |
|
| 63 |
mean += z; |
| 64 |
variance += z * z; |
| 65 |
iValues++; |
| 66 |
} |
| 67 |
} |
| 68 |
} |
| 69 |
|
| 70 |
if( iValues > 0 ){ |
| 71 |
mean /= (double) iValues;
|
| 72 |
variance = variance / (double) iValues - mean * mean;
|
| 73 |
} |
| 74 |
statisticsCalculated = true;
|
| 75 |
} |
| 76 |
|
| 77 |
/**
|
| 78 |
* Obtiene el valor m?ximo del grid
|
| 79 |
* @return Valor m?ximo
|
| 80 |
*/
|
| 81 |
public double getMax() { |
| 82 |
return max;
|
| 83 |
} |
| 84 |
|
| 85 |
/**
|
| 86 |
* Obtiene el valor m?dio del grid
|
| 87 |
* @return Valor medio
|
| 88 |
*/
|
| 89 |
public double getMean() { |
| 90 |
return mean;
|
| 91 |
} |
| 92 |
|
| 93 |
/**
|
| 94 |
* Obtiene el valor m?ximo del grid
|
| 95 |
* @return Valor m?nimo
|
| 96 |
*/
|
| 97 |
public double getMin() { |
| 98 |
return min;
|
| 99 |
} |
| 100 |
|
| 101 |
/**
|
| 102 |
* Consulta si las estadisticas han sido calculadas o no.
|
| 103 |
* @return true si las estadisticas del grid est?n calculadas y false si no lo est?n
|
| 104 |
*/
|
| 105 |
public boolean isStatisticsCalculated() { |
| 106 |
return statisticsCalculated;
|
| 107 |
} |
| 108 |
|
| 109 |
/**
|
| 110 |
* Asigna el flag que informa si las estadisticas est?n calculadas para un grid concreto
|
| 111 |
* @param calc true si est?n calculadas y false si no lo est?n
|
| 112 |
*/
|
| 113 |
public void setStatisticsCalculated(boolean calc){ |
| 114 |
this.statisticsCalculated = calc;
|
| 115 |
} |
| 116 |
|
| 117 |
/**
|
| 118 |
* Obtiene la varianza
|
| 119 |
* @return Varianza
|
| 120 |
*/
|
| 121 |
public double getVariance() { |
| 122 |
return variance;
|
| 123 |
} |
| 124 |
} |