root / org.gvsig.toolbox / trunk / org.gvsig.toolbox / org.gvsig.toolbox.algorithm / src / main / java / es / unex / sextante / morphometry / aspect / AspectAlgorithm.java @ 59
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package es.unex.sextante.morphometry.aspect; |
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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 AspectAlgorithm |
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extends
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GeoAlgorithm {
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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 ASPECT = "ASPECT"; |
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public static final String METHOD = "METHOD"; |
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public static final String UNITS = "UNITS"; |
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public static final String DEM = "DEM"; |
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public final static int UNITS_RADIANS = 0; |
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public final static int UNITS_DEGREES = 1; |
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public final static int UNITS_PERCENTAGE = 2; |
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public final static int METHOD_MAXIMUM_SLOPE = 0; |
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public final static int METHOD_TARBOTON = 1; |
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public final static int METHOD_BURGESS = 2; |
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public final static int METHOD_BAUER = 3; |
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public final static int METHOD_HEERDEGEN = 4; |
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public final static int METHOD_ZEVENBERGEN = 5; |
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public final static int METHOD_HARALICK = 6; |
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private static final double DEG_45_IN_RAD = Math.toRadians(45); |
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private static final double DEG_90_IN_RAD = Math.toRadians(90); |
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private static final double DEG_180_IN_RAD = Math.toRadians(180); |
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private static final double DEG_270_IN_RAD = Math.toRadians(270); |
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IRasterLayer m_DEM = null;
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IRasterLayer m_Aspect; |
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private double _6DX; |
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private double _2DX; |
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private int m_iUnits; |
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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_iUnits = m_Parameters.getParameterValueAsInt(UNITS); |
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m_DEM = m_Parameters.getParameterValueAsRasterLayer(DEM); |
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m_Aspect = getNewRasterLayer(ASPECT, Sextante.getText("Aspect"), IRasterLayer.RASTER_DATA_TYPE_FLOAT);
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final AnalysisExtent extent = m_Aspect.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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_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_MaximumSlope(x, y); |
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break;
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case 1: |
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Do_Tarboton(x, y); |
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break;
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case 2: |
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Do_LeastSquare(x, y); |
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break;
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case 3: |
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Do_FD_BRM(x, y); |
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break;
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case 4: |
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Do_FD_Heerdegen(x, y); |
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break;
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case 5: |
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Do_FD_Zevenbergen(x, y); |
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break;
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case 6: |
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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("M\u00e1ximum_slope__Travis_et_al_1975"), |
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Sextante.getText("Maximum_Triangle_Slope__Tarboton_1997"),
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Sextante.getText("Plane_fitting__Costa-Cabral_&_Burgess_1996"),
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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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final String[] sUnits = { Sextante.getText("Radians"), Sextante.getText("Degrees") }; |
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setName(Sextante.getText("Aspect"));
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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(UNITS, Sextante.getText("Units"), sUnits);
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m_Parameters.addSelection(METHOD, Sextante.getText("Method"), sMethod);
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addOutputRasterLayer(ASPECT, Sextante.getText("Aspect"));
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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_MaximumSlope(final int x, |
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final int y) { |
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int i, Aspect;
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double z, z2, dSlope, dMaxSlope;
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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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dMaxSlope = 0.0;
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for (Aspect = -1, 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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dSlope = Math.atan((z - z2) / m_DEM.getDistToNeighborInDir(i));
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if (dSlope > dMaxSlope) {
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Aspect = i; |
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dMaxSlope = dSlope; |
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} |
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} |
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} |
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if (Aspect < 0.0) { |
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Set_Parameters_NoData(x, y); |
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} |
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else {
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Set_Parameters(x, y, Aspect * DEG_45_IN_RAD); |
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} |
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} |
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} |
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private void Do_Tarboton(final int x, |
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final int y) { |
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int i, j;
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double z, z2, zm[], iSlope, iAspect, Slope, Aspect, G, H; |
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zm = new double[8]; |
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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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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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zm[i] = z2; |
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} |
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else {
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z2 = m_DEM.getCellValueAsDouble(x + m_iOffsetX[(i + 4) % 8], y + m_iOffsetY[(i + 4) % 8]); |
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if (!m_DEM.isNoDataValue(z2)) {
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zm[i] = z - (z2 - z); |
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} |
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else {
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zm[i] = z; |
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} |
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} |
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} |
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Slope = 0.0;
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Aspect = -1.0;
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for (i = 0, j = 1; i < 8; i++, j = (j + 1) % 8) { |
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if ((i % 2) != 0) // i => diagonal |
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{
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G = (z - zm[j]) / m_DEM.getWindowCellSize(); |
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H = (zm[j] - zm[i]) / m_DEM.getWindowCellSize(); |
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} |
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else // i => orthogonal |
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{
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G = (z - zm[i]) / m_DEM.getWindowCellSize(); |
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H = (zm[i] - zm[j]) / m_DEM.getWindowCellSize(); |
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} |
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if (H < 0.0) { |
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iAspect = 0.0;
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iSlope = G; |
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} |
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else if (H > G) { |
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iAspect = DEG_45_IN_RAD; |
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iSlope = (z - zm[((i % 2) != 0) ? i : j]) / (Math.sqrt(2.0) * m_DEM.getWindowCellSize()); |
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} |
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else {
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iAspect = Math.atan(H / G);
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iSlope = Math.sqrt(G * G + H * H);
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} |
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if (iSlope > Slope) {
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Aspect = i * DEG_45_IN_RAD + (((i % 2) != 0) ? DEG_45_IN_RAD - iAspect : iAspect); |
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Slope = iSlope; |
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} |
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} |
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if (Aspect < 0.0) { |
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Set_Parameters_NoData(x, y); |
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} |
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else {
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Set_Parameters(x, y, Aspect); |
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} |
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} |
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} |
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private void Do_LeastSquare(final int x, |
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final int y) { |
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double zm[], a, b; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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a = ((zm[2] + 2 * zm[5] + zm[8]) - (zm[0] + 2 * zm[3] + zm[6])) / (8 * m_DEM.getWindowCellSize()); |
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b = ((zm[6] + 2 * zm[7] + zm[8]) - (zm[0] + 2 * zm[1] + zm[2])) / (8 * m_DEM.getWindowCellSize()); |
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if (a != 0.0) { |
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Set_Parameters(x, y, DEG_180_IN_RAD + Math.atan2(b, a));
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} |
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else if (b > 0.0) { |
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Set_Parameters(x, y, DEG_270_IN_RAD); |
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} |
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else if (b < 0.0) { |
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Set_Parameters(x, y, DEG_90_IN_RAD); |
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} |
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else {
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Set_Parameters_NoData(x, y); |
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} |
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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[], G, H; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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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, 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[], G, H; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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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, 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[], G, H; |
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zm = new double[9]; |
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if (Get_SubMatrix3x3(x, y, zm)) {
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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, 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[2]; |
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if (Get_SubMatrix5x5(x, y, zm)) {
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for (i = 0; i < 2; 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[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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double dAspect) {
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if (m_iUnits == UNITS_DEGREES) {
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dAspect = Math.toDegrees(dAspect);
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} |
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m_Aspect.setCellValue(x, y, dAspect); |
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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 G, |
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final double H) { |
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if (G != 0.0) { |
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Set_Parameters(x, y, DEG_180_IN_RAD + Math.atan2(H, G));
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} |
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else if (H > 0.0) { |
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Set_Parameters(x, y, DEG_270_IN_RAD); |
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} |
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else if (H < 0.0) { |
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Set_Parameters(x, y, DEG_90_IN_RAD); |
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} |
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else {
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m_Aspect.setNoData(x, y); |
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} |
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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_Aspect.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_iOffsetX[(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++) { |
| 465 |
jx = ix < 0 ? 0 : (ix >= m_DEM.getNX() ? m_DEM.getNY() - 1 : ix); |
| 466 |
z2 = m_DEM.getCellValueAsDouble(jx, jy); |
| 467 |
if (!m_DEM.isNoDataValue(z2)) {
|
| 468 |
SubMatrix[i] = z2 - z; |
| 469 |
} |
| 470 |
else {
|
| 471 |
SubMatrix[i] = 0.0;
|
| 472 |
} |
| 473 |
} |
| 474 |
} |
| 475 |
|
| 476 |
return (true); |
| 477 |
} |
| 478 |
|
| 479 |
return (false); |
| 480 |
} |
| 481 |
|
| 482 |
} |