Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/AreaInterpolation.java @ 801:d766fe2d917a

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More javadoc. gnv-artifacts/trunk@883 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 06 Apr 2010 16:53:43 +0000
parents c4156275c1e1
children 2e951160c43d
rev   line source
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1 package de.intevation.gnv.math;
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2
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3 import com.vividsolutions.jts.geom.Coordinate;
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4 import com.vividsolutions.jts.geom.Envelope;
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5
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6 import com.vividsolutions.jts.index.strtree.STRtree;
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7
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8 import java.awt.Dimension;
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9
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10 import java.io.Serializable;
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11
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12 import java.util.Arrays;
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13 import java.util.List;
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14
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15 import org.apache.log4j.Logger;
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16
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17 /**
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18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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19 */
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20 public class AreaInterpolation
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21 implements Serializable
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22 {
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23 private static Logger log = Logger.getLogger(AreaInterpolation.class);
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24
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25 protected double [] raster;
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26
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27 protected int width;
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28 protected int height;
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30 public AreaInterpolation() {
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31 }
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32
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33 public int getWidth() {
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34 return width;
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35 }
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36
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37 public int getHeight() {
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38 return height;
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39 }
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40
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41 public double [] getRaster() {
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42 return raster;
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43 }
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44
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45 public static final double EPS = 1e-6d;
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47
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48 public boolean interpolate(
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49 List<? extends Point2d> points,
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50 Envelope boundingBox,
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51 Dimension samples,
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52 XYDepth depth,
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53 int extrapolationRounds
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54 ) {
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55 boolean debug = log.isDebugEnabled();
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56
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57 if (points == null || points.isEmpty()) {
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58 log.warn("no points to interpolate");
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59 return false;
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60 }
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61
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62 List<GridCell> cells = GridCell.pointsToGridCells(
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63 points,
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64 Interpolation2D.relevantArea(
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65 boundingBox,
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66 points),
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67 extrapolationRounds);
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68
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69 if (cells.isEmpty()) {
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70 log.warn("no cells to interpolate");
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71 return false;
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72 }
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73
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74 int W = samples.width;
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75 int H = samples.height;
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76
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77 double cellWidth = boundingBox.getWidth() / W;
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78 double cellHeight = boundingBox.getHeight() / H;
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79
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80 STRtree spatialIndex = new STRtree();
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81
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82 for (GridCell cell: cells) {
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83 spatialIndex.insert(cell.getEnvelope(), cell);
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84 }
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85
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86 if (debug) {
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87 log.debug("width: " + boundingBox.getWidth());
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88 log.debug("height: " + boundingBox.getHeight());
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89 log.debug("sample width: " + W);
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90 log.debug("sample height: " + H);
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91 log.debug("cell width: " + cellWidth);
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92 log.debug("cell height: " + cellHeight);
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93 }
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94
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95 Envelope queryBuffer = new Envelope();
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96 Coordinate center = new Coordinate();
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97 GridCell.CellFinder finder = new GridCell.CellFinder();
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98
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99 double [] raster = new double[W*H];
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100 Arrays.fill(raster, Double.NaN);
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101
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102 double minX = boundingBox.getMinX();
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103 double minY = boundingBox.getMinY();
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104
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105 long startTime = System.currentTimeMillis();
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106
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107 int pos = 0;
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108 for (int j = 0; j < H; ++j) {
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109
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110 double y = j*cellHeight + 0.5d*cellHeight + minY;
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111 double x = 0.5d*cellWidth + minX;
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113 for (int end = pos + W; pos < end; ++pos, x += cellWidth) {
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114
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115 queryBuffer.init(x - EPS, x + EPS, y - EPS, y + EPS);
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116 center.x = x; center.y = y;
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117 finder.prepare(center);
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118 spatialIndex.query(queryBuffer, finder);
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119
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120 GridCell found = finder.found;
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121
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122 if (found == null || depth.depth(center) > 0d) {
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123 continue;
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124 }
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125
514
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126 double z1 = Interpolation2D.interpolate(
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127 found.p1.x, found.p1.z,
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128 found.p2.x, found.p2.z,
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129 center.x);
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130 double z2 = Interpolation2D.interpolate(
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131 found.p3.x, found.p3.z,
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132 found.p4.x, found.p4.z,
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133 center.x);
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134 double y1 = Interpolation2D.interpolate(
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135 found.p1.x, found.p1.y,
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136 found.p2.x, found.p2.y,
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137 center.x);
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138 double y2 = Interpolation2D.interpolate(
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139 found.p3.x, found.p3.y,
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140 found.p4.x, found.p4.y,
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141 center.x);
517
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142 raster[pos] = Interpolation2D.interpolate(
514
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143 y1, z1,
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144 y2, z2,
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145 center.y);
474
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146 }
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147 }
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148
501
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149 long stopTime = System.currentTimeMillis();
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150
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151 if (debug) {
801
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152 log.debug("interpolation took: " +
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153 (stopTime - startTime)/1000f + " secs");
501
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154 }
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155
474
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156 this.raster = raster;
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157 this.width = W;
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158 this.height = H;
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159
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160 return true;
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161 }
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162 }
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163 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org