root / org.gvsig.toolbox / trunk / org.gvsig.toolbox / org.gvsig.toolbox.algorithm / src / main / java / es / unex / sextante / morphometry / surfaceSpecificPoints / SurfaceSpecificPointsAlgorithm.java @ 59
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package es.unex.sextante.morphometry.surfaceSpecificPoints; |
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import es.unex.sextante.additionalInfo.AdditionalInfoNumericalValue; |
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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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import es.unex.sextante.exceptions.UnsupportedOutputChannelException; |
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public class SurfaceSpecificPointsAlgorithm |
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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 METHOD = "METHOD"; |
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public static final String DEM = "DEM"; |
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public static final String THRESHOLD = "THRESHOLD"; |
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public static final String RESULT = "RESULT"; |
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IRasterLayer m_DEM = null;
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IRasterLayer m_Result; |
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double m_dThreshold;
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int m_iNX, m_iNY;
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@Override
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public boolean processAlgorithm() throws GeoAlgorithmExecutionException { |
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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_dThreshold = m_Parameters.getParameterValueAsDouble(THRESHOLD); |
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m_Result = getNewRasterLayer(RESULT, Sextante.getText("Result"), IRasterLayer.RASTER_DATA_TYPE_INT);
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final AnalysisExtent extent = m_Result.getWindowGridExtent();
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m_DEM.setWindowExtent(extent); |
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m_iNX = m_DEM.getNX(); |
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m_iNY = m_DEM.getNY(); |
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switch (iMethod) {
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case 0: |
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doMarkHighestNB(); |
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break;
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case 1: |
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doOppositeNB(); |
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break;
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case 2: |
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doFlowDirection(); |
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break;
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case 3: |
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doPeuckerDouglas(); |
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break;
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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("Mark_Highest_Neighbour"), Sextante.getText("Opposite_neighbours"), |
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Sextante.getText("Flow_direction"), Sextante.getText("Peucker_&_Douglas") }; |
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setUserCanDefineAnalysisExtent(true);
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setGroup(Sextante.getText("Geomorphometry_and_terrain_analysis"));
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setName(Sextante.getText("Landform_classification"));
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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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m_Parameters.addNumericalValue(THRESHOLD, Sextante.getText("Threshold__Peucker_&_Douglas"), 0.01, |
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AdditionalInfoNumericalValue.NUMERICAL_VALUE_DOUBLE); |
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addOutputRasterLayer(RESULT, Sextante.getText("Result"));
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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 doMarkHighestNB() throws UnsupportedOutputChannelException { |
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int i, x, y, ix, iy, xlo, ylo, xhi, yhi;
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double lo, hi, z;
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IRasterLayer clo, chi; |
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clo = getTempRasterLayer(IRasterLayer.RASTER_DATA_TYPE_BYTE, m_Result.getWindowGridExtent()); |
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chi = getTempRasterLayer(IRasterLayer.RASTER_DATA_TYPE_BYTE, m_Result.getWindowGridExtent()); |
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for (y = 0; (y < m_iNY) && setProgress(y, m_iNY); y++) { |
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for (x = 0; x < m_iNX; x++) { |
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lo = hi = m_DEM.getCellValueAsDouble(x, y); |
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xhi = xlo = x; |
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yhi = ylo = y; |
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for (i = 0; i < 4; i++) { |
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ix = x + m_iOffsetX[i]; |
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iy = y + m_iOffsetY[i]; |
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z = m_DEM.getCellValueAsDouble(ix, iy); |
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if (!m_DEM.isNoDataValue(z)) {
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if (z > hi) {
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hi = z; |
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xhi = ix; |
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yhi = iy; |
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} |
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else if (z < lo) { |
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lo = z; |
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xlo = ix; |
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ylo = iy; |
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} |
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} |
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} |
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this.setProgress(y, m_iNY);
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clo.addToCellValue(xlo, ylo, 1);
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chi.addToCellValue(xhi, yhi, 1);
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} |
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} |
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for (y = 0; (y < m_iNY) && setProgress(y, m_iNY); y++) { |
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for (x = 0; x < m_iNX; x++) { |
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if (chi.getCellValueAsByte(x, y) == 0) { |
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if (clo.getCellValueAsByte(x, y) == 0) { |
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m_Result.setCellValue(x, y, 2);
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} |
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else {
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m_Result.setCellValue(x, y, 1);
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} |
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} |
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else if (clo.getCellValueAsByte(x, y) == 0) { |
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m_Result.setCellValue(x, y, -1);
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} |
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else {
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m_Result.setCellValue(x, y, 0);
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} |
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} |
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} |
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} |
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private void doOppositeNB() throws UnsupportedOutputChannelException { |
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int i, x, y, ix, iy, jx, jy;
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double z, iz, jz;
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IRasterLayer clo, chi; |
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clo = getTempRasterLayer(IRasterLayer.RASTER_DATA_TYPE_BYTE, m_Result.getWindowGridExtent()); |
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chi = getTempRasterLayer(IRasterLayer.RASTER_DATA_TYPE_BYTE, m_Result.getWindowGridExtent()); |
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for (y = 0; (y < m_iNY) && setProgress(y, m_iNY); y++) { |
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for (x = 0; x < m_iNX; x++) { |
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z = m_DEM.getCellValueAsDouble(x, y); |
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for (i = 0; i < 4; i++) { |
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ix = x + m_iOffsetX[i]; |
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iy = y + m_iOffsetY[i]; |
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iz = m_DEM.getCellValueAsDouble(ix, iy); |
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if (!m_DEM.isNoDataValue(iz)) {
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jx = x + m_iOffsetX[i + 4];
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jy = y + m_iOffsetX[i + 4];
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jz = m_DEM.getCellValueAsDouble(jx, jy); |
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if (!m_DEM.isNoDataValue(jz)) {
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if ((iz > z) && (jz > z)) {
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chi.addToCellValue(x, y, 1);
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} |
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else if ((iz < z) && (jz < z)) { |
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clo.addToCellValue(x, y, 1);
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} |
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} |
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} |
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} |
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} |
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} |
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for (y = 0; (y < m_iNY) && setProgress(y, m_iNY); y++) { |
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for (x = 0; x < m_iNX; x++) { |
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if (chi.getCellValueAsByte(x, y) != 0) { |
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if (clo.getCellValueAsByte(x, y) != 0) { |
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m_Result.setCellValue(x, y, 5);
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} |
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else {
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m_Result.setCellValue(x, y, chi.getCellValueAsByte(x, y)); |
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} |
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} |
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else if (clo.getCellValueAsByte(x, y) != 0) { |
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m_Result.setCellValue(x, y, -clo.getCellValueAsByte(x, y)); |
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} |
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else {
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m_Result.setCellValue(x, y, 0);
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} |
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} |
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} |
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} |
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private void doFlowDirection() { |
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boolean bLower;
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int x, y, i, ix, iy, xLow = 0, yLow = 0; |
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double z, iz, zLow = 0.; |
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m_Result.assign(0.0);
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for (y = 0; (y < m_iNY) && setProgress(y, m_iNY); y++) { |
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for (x = 0; x < m_iNX; x++) { |
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z = m_DEM.getCellValueAsDouble(x, y); |
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bLower = false;
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for (i = 0; i < 8; i++) { |
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ix = x + m_iOffsetX[i]; |
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iy = y + m_iOffsetY[i]; |
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iz = m_DEM.getCellValueAsDouble(ix, iy); |
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if (!m_DEM.isNoDataValue(iz)) {
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if (iz < z) {
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if (!bLower) {
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bLower = true;
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zLow = iz; |
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xLow = ix; |
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yLow = iy; |
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} |
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else if (iz < zLow) { |
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zLow = iz; |
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xLow = ix; |
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yLow = iy; |
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} |
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} |
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} |
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} |
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if (bLower) {
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m_Result.addToCellValue(xLow, yLow, 1);
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} |
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} |
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} |
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} |
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private void doPeuckerDouglas() { |
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boolean wasPlus;
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int x, y, i, ix, iy, nSgn;
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double d, dPlus, dMinus, z, iz, alt[]; |
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alt = new double[8]; |
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for (y = 0; (y < m_iNY) && setProgress(y, m_iNY); y++) { |
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for (x = 0; x < m_iNX; x++) { |
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z = m_DEM.getCellValueAsDouble(x, y); |
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for (i = 0; i < 8; i++) { |
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ix = x + m_iOffsetX[i]; |
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iy = y + m_iOffsetY[i]; |
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iz = m_DEM.getCellValueAsDouble(ix, iy); |
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if (!m_DEM.isNoDataValue(iz)) {
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alt[i] = iz; |
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} |
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else {
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alt[i] = z; |
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} |
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} |
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dPlus = dMinus = 0;
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nSgn = 0;
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wasPlus = (alt[7] - z > 0) ? true : false; |
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for (i = 0; i < 8; i++) { |
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d = alt[i] - z; |
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if (d > 0) { |
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dPlus += d; |
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if (!wasPlus) {
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nSgn++; |
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wasPlus = true;
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} |
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} |
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else if (d < 0) { |
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dMinus -= d; |
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if (wasPlus) {
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nSgn++; |
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wasPlus = false;
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} |
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} |
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} |
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i = 0;
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if (dPlus == 0) { |
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i = 9;
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} |
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else if (dMinus == 0) { |
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i = -9;
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} |
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else if (nSgn == 4) { |
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i = 1;
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} |
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else if (nSgn == 2) { |
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i = nSgn = 0;
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if (alt[7] > z) { |
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while (alt[i++] > z) {
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; |
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} |
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do {
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nSgn++; |
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} |
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while (alt[i++] < z);
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} |
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else {
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while (alt[i++] < z) {
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; |
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} |
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do {
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nSgn++; |
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} |
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while (alt[i++] > z);
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} |
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i = 0;
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if (nSgn == 4) { |
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if (dMinus - dPlus > m_dThreshold) {
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i = 2;
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} |
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else if (dPlus - dMinus > m_dThreshold) { |
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i = -2;
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} |
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} |
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else { // lines: |
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if (dMinus - dPlus > 0) { |
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i = 7;
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} |
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else {
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// Channel
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i = -7;
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} |
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} |
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} |
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m_Result.setCellValue(x, y, i); |
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} |
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} |
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} |
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} |