Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/AreaInterpolation.java @ 482:64e65daa65e9

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Fixed some bugs with calculating "Horizontalschnitte". gnv-artifacts/trunk@557 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 17 Jan 2010 21:26:21 +0000
parents d47b478e662b
children 6e8364e766fa
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.Arrays;
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13 import java.util.Collections;
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14 import java.util.List;
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15
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16 import org.apache.log4j.Logger;
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17
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18 /**
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19 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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20 */
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21 public class AreaInterpolation
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22 implements Serializable
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23 {
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24 private static Logger log = Logger.getLogger(AreaInterpolation.class);
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25
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26 protected double [] raster;
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27
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28 protected int width;
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29 protected int height;
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30
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31 public AreaInterpolation() {
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32 }
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33
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34 public int getWidth() {
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35 return width;
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36 }
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37
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38 public int getHeight() {
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39 return height;
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40 }
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41
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42 public double [] getRaster() {
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43 return raster;
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44 }
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45
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46 public boolean interpolate(
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47 List<? extends Point2d> points,
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48 Envelope boundingBox,
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49 Dimension samples,
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50 XYDepth depth
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51 ) {
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52 boolean debug = log.isDebugEnabled();
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53
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54 if (points == null || points.isEmpty()) {
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55 if (debug) {
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56 log.debug("no points to interpolate");
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57 }
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58 return false;
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59 }
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60
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61 double [] buffer = Interpolation2D.calculateBuffer(points);
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62 double dxMax = buffer[0];
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63 double dyMax = buffer[1];
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64
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65 Quadtree spatialIndex = new Quadtree();
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66
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67 for (int i = points.size()-1; i >= 0; --i) {
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68 Point2d p = points.get(i);
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69 spatialIndex.insert(p.envelope(), p);
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70 }
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71
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72 int W = samples.width;
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73 int H = samples.height;
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74
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75 double cellWidth = boundingBox.getWidth() / W;
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76 double cellHeight = boundingBox.getHeight() / H;
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77
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78 if (debug) {
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79 log.debug("width: " + boundingBox.getWidth());
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80 log.debug("height: " + boundingBox.getHeight());
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81 log.debug("sample width: " + W);
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82 log.debug("sample height: " + H);
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83 log.debug("cell width: " + cellWidth);
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84 log.debug("cell height: " + cellHeight);
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85 log.debug("buffer x: " + dxMax);
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86 log.debug("buffer y: " + dyMax);
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87 }
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88
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89 Envelope queryBuffer = new Envelope();
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90 Point2d [] neighbors = new Point2d[4];
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91 Coordinate center = new Coordinate();
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92 L1Comparator invL1 = new L1Comparator(center);
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93
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94 double [] raster = new double[W*H];
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95 Arrays.fill(raster, Double.NaN);
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96
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97 double minX = boundingBox.getMinX();
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98 double minY = boundingBox.getMinY();
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99
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100 int row = 0;
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101 for (int j = 0; j < H; ++j, row += W) {
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102 double y = j*cellHeight + 0.5d*cellHeight + minY;
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103 double x = 0.5d*cellWidth + minX;
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104 for (int i = 0; i < W; ++i, x += cellWidth) {
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105 queryBuffer.init(
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106 x - dxMax, x + dxMax,
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107 y - dyMax, y + dyMax);
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108
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109 List potential = spatialIndex.query(queryBuffer);
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110
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111 if (potential.size() < 4) {
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112 continue;
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113 }
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114
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115 center.x = x; center.y = y;
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116 Collections.sort(potential, invL1);
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117
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118 neighbors[0] = neighbors[1] =
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119 neighbors[2] = neighbors[3] = null;
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120
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121 int mask = 0;
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122 // reversed order is essential here!
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123 for (int k = potential.size()-1; k >= 0; --k) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 Point2d n = (Point2d)potential.get(k);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
125 int code = n.x > center.x ? 1 : 0;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
126 if (n.y > center.y) code |= 2;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
127 neighbors[code] = n;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
128 mask |= 1 << code;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
129 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
130
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
131 int numNeighbors = Integer.bitCount(mask);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
133 // only interpolate if we have all four neighbors
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134 // 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
135 if (numNeighbors == 4
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 && !neighbors[0].hasIGap(neighbors[1])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137 && !neighbors[1].hasJGap(neighbors[3])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 && !neighbors[3].hasIGap(neighbors[2])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 && !neighbors[2].hasJGap(neighbors[0])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 && depth.depth(center) <= 0d
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 ) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 double z1 = Interpolation2D.interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 neighbors[0].x, neighbors[0].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
144 neighbors[1].x, neighbors[1].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 double z2 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147 neighbors[2].x, neighbors[2].z,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 neighbors[3].x, neighbors[3].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 double y1 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 neighbors[0].x, neighbors[0].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 neighbors[1].x, neighbors[1].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 double y2 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 neighbors[2].x, neighbors[2].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 neighbors[3].x, neighbors[3].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158 raster[row+i] = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159 y1, z1,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160 y2, z2,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 center.y);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
165
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
166 this.raster = raster;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
167 this.width = W;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
168 this.height = H;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
169
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
170 return true;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
171 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
172 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
173 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org