root / org.gvsig.toolbox / trunk / org.gvsig.toolbox / org.gvsig.toolbox.algorithm / src / main / java / es / unex / sextante / morphometry / curvatures / CurvaturesAlgorithm.java @ 59
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package es.unex.sextante.morphometry.curvatures; |
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import es.unex.sextante.core.GeoAlgorithm; |
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import es.unex.sextante.core.AnalysisExtent; |
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import es.unex.sextante.core.Sextante; |
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import es.unex.sextante.dataObjects.IRasterLayer; |
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import es.unex.sextante.exceptions.GeoAlgorithmExecutionException; |
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import es.unex.sextante.exceptions.RepeatedParameterNameException; |
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public class CurvaturesAlgorithm |
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extends
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GeoAlgorithm {
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private final static double PLAN_THRESHOLD = 0.00001; |
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private final static int m_iOffsetX[] = { 0, 1, 1, 1, 0, -1, -1, -1 }; |
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private final static int m_iOffsetY[] = { 1, 1, 0, -1, -1, -1, 0, 1 }; |
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public static final String METHOD = "METHOD"; |
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public static final String DEM = "DEM"; |
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public static final String HORZ = "HORZ"; |
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public static final String VERT = "VERT"; |
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public static final String GLOBAL = "GLOBAL"; |
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public static final String CLASS = "CLASS"; |
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IRasterLayer m_DEM = null;
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IRasterLayer m_Curv; |
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IRasterLayer m_hCurv; |
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IRasterLayer m_vCurv; |
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IRasterLayer m_CurvClass; |
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private double _6DX; |
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private double _2DX; |
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private double _4_DX2; |
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private double _DX2; |
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@Override
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public boolean processAlgorithm() throws GeoAlgorithmExecutionException { |
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int x, y;
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int iNX, iNY;
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final int iMethod = m_Parameters.getParameterValueAsInt(METHOD); |
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m_DEM = m_Parameters.getParameterValueAsRasterLayer(DEM); |
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m_hCurv = getNewRasterLayer(HORZ, Sextante.getText("Horizontal_curvature"), IRasterLayer.RASTER_DATA_TYPE_FLOAT);
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m_vCurv = getNewRasterLayer(VERT, Sextante.getText("Vertical_curvature"), IRasterLayer.RASTER_DATA_TYPE_FLOAT);
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m_Curv = getNewRasterLayer(GLOBAL, Sextante.getText("Curvature"), IRasterLayer.RASTER_DATA_TYPE_FLOAT);
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m_CurvClass = getNewRasterLayer(CLASS, Sextante.getText("Classification"), IRasterLayer.RASTER_DATA_TYPE_SHORT);
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final AnalysisExtent extent = m_hCurv.getWindowGridExtent();
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m_DEM.setWindowExtent(extent); |
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iNX = m_DEM.getNX(); |
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iNY = m_DEM.getNY(); |
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_2DX = m_DEM.getWindowCellSize() * 2.;
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_DX2 = m_DEM.getWindowCellSize() * m_DEM.getWindowCellSize(); |
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_4_DX2 = 4 * m_DEM.getWindowCellSize() * m_DEM.getWindowCellSize();
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_6DX = m_DEM.getWindowCellSize() * 6.;
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for (y = 0; (y < iNY) && setProgress(y, iNY); y++) { |
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for (x = 0; x < iNX; x++) { |
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switch (iMethod) {
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case 0: |
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Do_FD_BRM(x, y); |
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break;
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case 1: |
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Do_FD_Heerdegen(x, y); |
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break;
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case 2: |
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Do_FD_Zevenbergen(x, y); |
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break;
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case 3: |
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Do_FD_Haralick(x, y); |
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break;
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} |
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} |
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} |
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return !m_Task.isCanceled();
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} |
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@Override
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public void defineCharacteristics() { |
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final String[] sMethod = { Sextante.getText("Fit_2_Degree_Polynom__Bauer_Rohdenburg_Bork_1985"), |
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Sextante.getText("Fit_2_Degree_Polynom__Heerdegen_&_Beran_1982"),
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Sextante.getText("Fit_2_Degree_Polynom__Zevenbergen_&_Thorne_1987"),
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Sextante.getText("Fit_3_Degree_Polynom__Haralick_1983") };
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setName(Sextante.getText("Curvatures"));
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setGroup(Sextante.getText("Geomorphometry_and_terrain_analysis"));
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setUserCanDefineAnalysisExtent(true);
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try {
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m_Parameters.addInputRasterLayer(DEM, Sextante.getText("Elevation"), true); |
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m_Parameters.addSelection(METHOD, Sextante.getText("Method"), sMethod);
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addOutputRasterLayer(HORZ, Sextante.getText("Horizontal_curvature"));
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addOutputRasterLayer(VERT, Sextante.getText("Vertical_curvature"));
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addOutputRasterLayer(GLOBAL, Sextante.getText("Curvature"));
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addOutputRasterLayer(CLASS, Sextante.getText("Classification"));
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} |
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catch (final RepeatedParameterNameException e) { |
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Sextante.addErrorToLog(e); |
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} |
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} |
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private void Do_FD_BRM(final int x, |
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final int y) { |
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double zm[], D, E, F, G, H; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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D = ((zm[0] + zm[2] + zm[3] + zm[5] + zm[6] + zm[8]) - 2 * (zm[1] + zm[4] + zm[7])) / _DX2; |
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E = ((zm[0] + zm[6] + zm[1] + zm[7] + zm[2] + zm[8]) - 2 * (zm[3] + zm[4] + zm[5])) / _DX2; |
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F = (zm[8] + zm[0] - zm[7]) / _4_DX2; |
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G = ((zm[2] - zm[0]) + (zm[5] - zm[3]) + (zm[8] - zm[6])) / _6DX; |
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H = ((zm[6] - zm[0]) + (zm[7] - zm[1]) + (zm[8] - zm[2])) / _6DX; |
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Set_Parameters_Derive(x, y, D, E, F, G, H); |
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} |
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} |
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private void Do_FD_Heerdegen(final int x, |
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final int y) { |
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double zm[], a, b, D, E, F, G, H; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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a = zm[0] + zm[2] + zm[3] + zm[5] + zm[6] + zm[8]; |
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b = zm[0] + zm[1] + zm[2] + zm[6] + zm[7] + zm[8]; |
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D = (0.3 * a - 0.2 * b) / _DX2; |
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E = (0.3 * b - 0.2 * a) / _DX2; |
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F = (zm[0] - zm[2] - zm[6] + zm[8]) / _4_DX2; |
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G = (-zm[0] + zm[2] - zm[3] + zm[5] - zm[6] + zm[8]) / _6DX; |
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H = (-zm[0] - zm[1] - zm[2] + zm[6] + zm[7] + zm[8]) / _6DX; |
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Set_Parameters_Derive(x, y, D, E, F, G, H); |
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} |
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} |
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private void Do_FD_Zevenbergen(final int x, |
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final int y) { |
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double zm[], D, E, F, G, H; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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D = ((zm[3] + zm[5]) / 2.0 - zm[4]) / _DX2; |
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E = ((zm[1] + zm[7]) / 2.0 - zm[4]) / _DX2; |
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F = (zm[0] - zm[2] - zm[6] + zm[8]) / _4_DX2; |
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G = (zm[5] - zm[3]) / _2DX; |
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H = (zm[7] - zm[1]) / _2DX; |
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Set_Parameters_Derive(x, y, D, E, F, G, H); |
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} |
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} |
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private void Do_FD_Haralick(final int x, |
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final int y) { |
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final int Mtrx[][][] = { |
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{ { 31, -5, -17, -5, 31 }, { -44, -62, -68, -62, -44 }, { 0, 0, 0, 0, 0 }, { 44, 62, 68, 62, 44 },
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{ -31, 5, 17, 5, -31 } },
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{ { 31, -44, 0, 44, -31 }, { -5, -62, 0, 62, 5 }, { -17, -68, 0, 68, 17 }, { -5, -62, 0, 62, 5 },
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{ 31, -44, 0, 44, -31 } },
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{ { 2, 2, 2, 2, 2 }, { -1, -1, -1, -1, -1 }, { -2, -2, -2, -2, -2 }, { -1, -1, -1, -1, -1 }, { 2, 2, 2, 2, 2 } },
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{ { 4, 2, 0, -2, -4 }, { 2, 1, 0, -1, -2 }, { 0, 0, 0, 0, 0 }, { -2, -1, 0, 1, 2 }, { -4, -2, 0, 2, 4 } },
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{ { 2, -1, -2, -1, 2 }, { 2, -1, -2, -1, 2 }, { 2, -1, -2, -1, 2 }, { 2, -1, -2, -1, 2 }, { 2, -1, -2, -1, 2 } } };
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final int QMtrx[] = { 4200, 4200, 700, 1000, 700 }; |
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int i, ix, iy, n;
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double Sum, zm[], k[]; |
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zm = new double[25]; |
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k = new double[5]; |
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if (Get_SubMatrix5x5(x, y, zm)) {
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for (i = 0; i < 5; i++) { |
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for (n = 0, Sum = 0.0, iy = 0; iy < 5; iy++) { |
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for (ix = 0; ix < 5; ix++, n++) { |
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Sum += zm[n] * Mtrx[i][ix][iy]; |
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} |
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} |
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k[i] = Sum / QMtrx[i]; |
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} |
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Set_Parameters_Derive(x, y, k[4], k[2], k[3], k[1], k[0]); |
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} |
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} |
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// additional methods
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private void Set_Parameters(final int x, |
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final int y, |
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final double dCurv, |
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final double dHCurv, |
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final double dVCurv) { |
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int iClass;
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m_Curv.setCellValue(x, y, dCurv); |
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m_hCurv.setCellValue(x, y, dHCurv); |
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m_vCurv.setCellValue(x, y, dVCurv); |
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iClass = dHCurv < -PLAN_THRESHOLD ? 0 : (dHCurv <= PLAN_THRESHOLD ? 3 : 6); |
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iClass += dVCurv < -PLAN_THRESHOLD ? 0 : (dVCurv <= PLAN_THRESHOLD ? 1 : 2); |
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m_CurvClass.setCellValue(x, y, iClass); |
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} |
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private void Set_Parameters_Derive(final int x, |
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final int y, |
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final double D, |
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final double E, |
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final double F, |
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final double G, |
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final double H) { |
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double k1, k2, Curv, vCurv, hCurv;
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k1 = F * G * H; |
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k2 = G * G + H * H; |
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if (k2 != 0) { |
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Curv = -2.0 * (E + D);
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vCurv = -2.0 * (D * G * G + E * H * H + k1) / k2;
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hCurv = -2.0 * (D * H * H + E * G * G - k1) / k2;
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} |
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else {
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Curv = vCurv = hCurv = 0.0;
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} |
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Set_Parameters(x, y, Curv, hCurv, vCurv); |
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} |
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private void Set_Parameters_NoData(final int x, |
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final int y) { |
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m_Curv.setNoData(x, y); |
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m_hCurv.setNoData(x, y); |
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m_vCurv.setNoData(x, y); |
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} |
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// ---------------------------------------------------------
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// Indexing of the Submatrix:
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//
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// +-------+ +-------+
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// | 7 0 1 | | 2 5 8 |
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// | 6 * 2 | => | 1 4 7 |
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// | 5 4 3 | | 0 3 6 |
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// +-------+ +-------+
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//
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// ---------------------------------------------------------
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private boolean Get_SubMatrix3x3(final int x, |
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final int y, |
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final double SubMatrix[]) { |
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final int iSub[] = { 5, 8, 7, 6, 3, 0, 1, 2 }; |
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int i;
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double z, z2;
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z = m_DEM.getCellValueAsDouble(x, y); |
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if (m_DEM.isNoDataValue(z)) {
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Set_Parameters_NoData(x, y); |
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} |
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else {
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SubMatrix[4] = 0.0; |
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for (i = 0; i < 8; i++) { |
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z2 = m_DEM.getCellValueAsDouble(x + m_iOffsetX[i], y + m_iOffsetY[i]); |
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if (!m_DEM.isNoDataValue(z2)) {
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SubMatrix[iSub[i]] = z2 - z; |
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} |
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else {
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z2 = m_DEM.getCellValueAsDouble(x + m_iOffsetY[(i + 4) % 8], y + m_iOffsetY[(i + 4) % 8]); |
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if (!m_DEM.isNoDataValue(z2)) {
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SubMatrix[iSub[i]] = z - z2; |
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} |
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else {
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SubMatrix[iSub[i]] = 0.0;
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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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return (false); |
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} |
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private boolean Get_SubMatrix5x5(final int x, |
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final int y, |
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final double SubMatrix[]) { |
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int i, ix, iy, jx, jy;
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double z, z2;
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z = m_DEM.getCellValueAsDouble(x, y); |
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if (!m_DEM.isNoDataValue(z)) {
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for (i = 0, iy = y - 2; iy <= y + 2; iy++) { |
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jy = iy < 0 ? 0 : (iy >= m_DEM.getNY() ? m_DEM.getNY() - 1 : iy); |
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for (ix = x - 2; ix <= x + 2; ix++, i++) { |
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jx = ix < 0 ? 0 : (ix >= m_DEM.getNX() ? m_DEM.getNY() - 1 : ix); |
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z2 = m_DEM.getCellValueAsDouble(jx, jy); |
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if (!m_DEM.isNoDataValue(z2)) {
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SubMatrix[i] = z2 - z; |
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} |
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else {
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SubMatrix[i] = 0.0;
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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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return (false); |
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} |
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} |