root / org.gvsig.toolbox / trunk / org.gvsig.toolbox / org.gvsig.toolbox.algorithm / src / main / java / es / unex / sextante / vegetationIndices / base / SlopeBasedAlgorithm.java @ 59
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1 | 59 | nbrodin | package es.unex.sextante.vegetationIndices.base; |
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2 | |||
3 | import es.unex.sextante.core.GeoAlgorithm; |
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4 | import es.unex.sextante.core.AnalysisExtent; |
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5 | import es.unex.sextante.core.Sextante; |
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6 | import es.unex.sextante.dataObjects.IRasterLayer; |
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7 | import es.unex.sextante.exceptions.GeoAlgorithmExecutionException; |
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8 | import es.unex.sextante.exceptions.OptionalParentParameterException; |
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9 | import es.unex.sextante.exceptions.RepeatedParameterNameException; |
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10 | import es.unex.sextante.exceptions.UndefinedParentParameterNameException; |
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11 | |||
12 | public abstract class SlopeBasedAlgorithm |
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13 | extends
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14 | GeoAlgorithm { |
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15 | |||
16 | public static final String LAYERRED = "LAYERRED"; |
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17 | public static final String BANDRED = "BANDRED"; |
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18 | public static final String BANDNIR = "BANDNIR"; |
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19 | public static final String LAYERNIR = "LAYERNIR"; |
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20 | public static final String RESULT = "RESULT"; |
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21 | |||
22 | private IRasterLayer m_LayerRed, m_LayerNIR;
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23 | protected double m_dNoData; |
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24 | |||
25 | |||
26 | @Override
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27 | public void defineCharacteristics() { |
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28 | |||
29 | setUserCanDefineAnalysisExtent(true);
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30 | setGroup(Sextante.getText("Vegetation_indices"));
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31 | this.setGroup(Sextante.getText("Vegetation_indices")); |
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32 | try {
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33 | m_Parameters.addInputRasterLayer(LAYERRED, Sextante.getText("Red_layer"), true); |
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34 | m_Parameters.addBand(BANDRED, Sextante.getText("Red_band"), LAYERRED);
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35 | m_Parameters.addInputRasterLayer(LAYERNIR, Sextante.getText("Near_infrared_layer"), true); |
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36 | m_Parameters.addBand(BANDNIR, Sextante.getText("Near_infrared_band"), LAYERNIR);
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37 | addOutputRasterLayer(RESULT, Sextante.getText("Result"));
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38 | } |
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39 | catch (final RepeatedParameterNameException e) { |
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40 | Sextante.addErrorToLog(e); |
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41 | } |
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42 | catch (final UndefinedParentParameterNameException e) { |
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43 | Sextante.addErrorToLog(e); |
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44 | } |
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45 | catch (final OptionalParentParameterException e) { |
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46 | Sextante.addErrorToLog(e); |
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47 | } |
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48 | |||
49 | } |
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50 | |||
51 | |||
52 | @Override
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53 | public boolean processAlgorithm() throws GeoAlgorithmExecutionException { |
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54 | |||
55 | int x, y;
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56 | int iNX, iNY;
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57 | double dRed;
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58 | double dNIR;
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59 | double dIndex;
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60 | AnalysisExtent extent; |
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61 | |||
62 | m_LayerRed = m_Parameters.getParameterValueAsRasterLayer(LAYERRED); |
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63 | final int iBandRed = m_Parameters.getParameterValueAsInt(BANDRED); |
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64 | m_LayerNIR = m_Parameters.getParameterValueAsRasterLayer(LAYERNIR); |
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65 | final int iBandNIR = m_Parameters.getParameterValueAsInt(BANDNIR); |
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66 | |||
67 | final IRasterLayer result = getNewRasterLayer(RESULT, getName(), IRasterLayer.RASTER_DATA_TYPE_DOUBLE);
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68 | |||
69 | extent = result.getWindowGridExtent(); |
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70 | |||
71 | m_LayerRed.setWindowExtent(extent); |
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72 | m_LayerNIR.setWindowExtent(extent); |
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73 | m_LayerRed.setInterpolationMethod(IRasterLayer.INTERPOLATION_NearestNeighbour); |
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74 | m_LayerNIR.setInterpolationMethod(IRasterLayer.INTERPOLATION_NearestNeighbour); |
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75 | |||
76 | iNX = m_LayerRed.getNX(); |
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77 | iNY = m_LayerRed.getNY(); |
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78 | |||
79 | m_dNoData = result.getNoDataValue(); |
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80 | |||
81 | for (y = 0; (y < iNY) && setProgress(y, iNY); y++) { |
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82 | for (x = 0; x < iNX; x++) { |
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83 | dRed = m_LayerRed.getCellValueAsDouble(x, y, iBandRed); |
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84 | dNIR = m_LayerNIR.getCellValueAsDouble(x, y, iBandNIR); |
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85 | if (!m_LayerRed.isNoDataValue(dRed) && !m_LayerNIR.isNoDataValue(dNIR)) {
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86 | dIndex = getIndex(dRed, dNIR); |
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87 | result.setCellValue(x, y, dIndex); |
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88 | } |
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89 | else {
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90 | result.setNoData(x, y); |
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91 | } |
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92 | } |
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93 | } |
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94 | |||
95 | return !m_Task.isCanceled();
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96 | |||
97 | } |
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98 | |||
99 | |||
100 | protected double getNDVI(final double dRed, |
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101 | final double dNIR) { |
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102 | |||
103 | return (dNIR - dRed) / (dNIR + dRed);
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104 | |||
105 | } |
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106 | |||
107 | |||
108 | protected abstract double getIndex(double dRed, |
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109 | double dNIR);
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110 | |||
111 | } |