Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/AreaInterpolation.java @ 498:4080b57dcb52

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Upgraded to Geotools 2.5.8. Write polygons and line strings to shape files. gnv-artifacts/trunk@578 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Jan 2010 21:23:28 +0000
parents 75306d856004
children 70adafe2b9d5
rev   line source
474
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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.quadtree.Quadtree;
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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.ArrayList;
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13 import java.util.Arrays;
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14 import java.util.Collections;
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15 import java.util.List;
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16
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17 import org.apache.log4j.Logger;
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18
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19 /**
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20 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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21 */
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22 public class AreaInterpolation
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23 implements Serializable
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24 {
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25 private static Logger log = Logger.getLogger(AreaInterpolation.class);
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26
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27 protected double [] raster;
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28
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29 protected int width;
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30 protected int height;
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31
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32 public AreaInterpolation() {
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33 }
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34
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35 public int getWidth() {
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36 return width;
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37 }
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38
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39 public int getHeight() {
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40 return height;
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41 }
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42
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43 public double [] getRaster() {
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44 return raster;
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45 }
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46
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47 public boolean interpolate(
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48 List<? extends Point2d> points,
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49 Envelope boundingBox,
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50 Dimension samples,
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51 XYDepth depth
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52 ) {
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53 boolean debug = log.isDebugEnabled();
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54
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55 if (points == null || points.isEmpty()) {
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56 if (debug) {
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57 log.debug("no points to interpolate");
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58 }
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59 return false;
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60 }
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61
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62 int W = samples.width;
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63 int H = samples.height;
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64
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65 double cellWidth = boundingBox.getWidth() / W;
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66 double cellHeight = boundingBox.getHeight() / H;
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67 Envelope gridEnvelope = new Envelope(boundingBox);
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68
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69 gridEnvelope.expandBy(2d*cellWidth, 2d*cellWidth);
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70
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71 ArrayList<Point2d>relevantPoints =
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72 new ArrayList<Point2d>();
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73
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74 for (int i = points.size()-1; i >= 0; --i) {
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75 if (gridEnvelope.contains(points.get(i))) {
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76 relevantPoints.add(points.get(i));
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77 }
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78 }
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79
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80 double [] buffer = Interpolation2D.calculateBuffer(relevantPoints);
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81 double dxMax = buffer[0];
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82 double dyMax = buffer[1];
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83
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84 Quadtree spatialIndex = new Quadtree();
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85
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86 for (int i = relevantPoints.size()-1; i >= 0; --i) {
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87 Point2d p = relevantPoints.get(i);
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88 spatialIndex.insert(p.envelope(), p);
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89 }
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90
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91 if (debug) {
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92 log.debug("points: " + relevantPoints.size());
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93 log.debug("width: " + boundingBox.getWidth());
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94 log.debug("height: " + boundingBox.getHeight());
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95 log.debug("sample width: " + W);
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96 log.debug("sample height: " + H);
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97 log.debug("cell width: " + cellWidth);
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98 log.debug("cell height: " + cellHeight);
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99 log.debug("buffer x: " + dxMax);
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100 log.debug("buffer y: " + dyMax);
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101 }
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102
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103 Envelope queryBuffer = new Envelope();
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104 Point2d [] neighbors = new Point2d[4];
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105 Coordinate center = new Coordinate();
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106 L1Comparator invL1 = new L1Comparator(center);
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107
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108 double [] raster = new double[W*H];
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109 Arrays.fill(raster, Double.NaN);
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110
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111 double minX = boundingBox.getMinX();
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112 double minY = boundingBox.getMinY();
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113
498
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114 int row = 0;
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115 for (int j = 0; j < H; ++j, row += W) {
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116 double y = j*cellHeight + 0.5d*cellHeight + minY;
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117 double x = 0.5d*cellWidth + minX;
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118 for (int i = 0; i < W; ++i, x += cellWidth) {
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119 queryBuffer.init(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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120 x - dxMax, x + dxMax,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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121 y - dyMax, y + dyMax);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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122
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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123 List potential = spatialIndex.query(queryBuffer);
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parents:
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124
482
64e65daa65e9 Fixed some bugs with calculating "Horizontalschnitte".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 479
diff changeset
125 if (potential.size() < 4) {
474
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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126 continue;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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127 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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128
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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129 center.x = x; center.y = y;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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130 Collections.sort(potential, invL1);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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131
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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132 neighbors[0] = neighbors[1] =
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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133 neighbors[2] = neighbors[3] = null;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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134
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
135 int mask = 0;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 // reversed order is essential here!
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137 for (int k = potential.size()-1; k >= 0; --k) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 Point2d n = (Point2d)potential.get(k);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 int code = n.x > center.x ? 1 : 0;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 if (n.y > center.y) code |= 2;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 neighbors[code] = n;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 mask |= 1 << code;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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144
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 int numNeighbors = Integer.bitCount(mask);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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146
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147 // only interpolate if we have all four neighbors
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 // we do not have any gaps and we are below surface.
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 if (numNeighbors == 4
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 && !neighbors[0].hasIGap(neighbors[1])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 && !neighbors[1].hasJGap(neighbors[3])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 && !neighbors[3].hasIGap(neighbors[2])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 && !neighbors[2].hasJGap(neighbors[0])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 && depth.depth(center) <= 0d
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 ) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 double z1 = Interpolation2D.interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157 neighbors[0].x, neighbors[0].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158 neighbors[1].x, neighbors[1].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160 double z2 = Interpolation2D.interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 neighbors[2].x, neighbors[2].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162 neighbors[3].x, neighbors[3].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164 double y1 = Interpolation2D.interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
165 neighbors[0].x, neighbors[0].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
166 neighbors[1].x, neighbors[1].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
167 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
168 double y2 = Interpolation2D.interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
169 neighbors[2].x, neighbors[2].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
170 neighbors[3].x, neighbors[3].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
171 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
172 raster[row+i] = Interpolation2D.interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
173 y1, z1,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
174 y2, z2,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
175 center.y);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
176 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
177 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
178 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
179
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
180 this.raster = raster;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
181 this.width = W;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
182 this.height = H;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
183
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
184 return true;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
185 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
186 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org