Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/AreaInterpolation.java @ 479:d47b478e662b

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Cleaned up imports gnv-artifacts/trunk@549 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 15 Jan 2010 20:39:30 +0000
parents ab29e4ff2fda
children 64e65daa65e9
rev   line source
474
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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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
479
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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
474
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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 if (points == null || points.isEmpty()) {
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53 return false;
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54 }
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55
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56 double [] buffer = Interpolation2D.calculateBuffer(points);
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57 double dxMax = buffer[0];
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58 double dyMax = buffer[1];
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59
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60 Quadtree spatialIndex = new Quadtree();
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61
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62 for (int i = points.size()-1; i >= 0; --i) {
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63 Point2d p = points.get(i);
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64 spatialIndex.insert(p.envelope(), p);
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65 }
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66
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67 int W = samples.width;
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68 int H = samples.height;
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69
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70 double cellWidth = boundingBox.getWidth() / W;
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71 double cellHeight = boundingBox.getHeight() / H;
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72
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73 Envelope queryBuffer = new Envelope();
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74 Point2d [] neighbors = new Point2d[4];
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75 Coordinate center = new Coordinate();
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76 L1Comparator invL1 = new L1Comparator(center);
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77
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78 double [] raster = new double[W*H];
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79 Arrays.fill(raster, Double.NaN);
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80
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81 int row = 0;
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82 for (int j = 0; j < H; ++j, row += W) {
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83 double y = j*cellHeight + 0.5d*cellHeight;
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84 double x = 0.5d*cellWidth;
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85 for (int i = 0; i < W; ++i, x += cellWidth) {
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86 queryBuffer.init(
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87 x - dxMax, x + dxMax,
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88 y - dyMax, y + dyMax);
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89
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90 List potential = spatialIndex.query(queryBuffer);
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91
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92 if (potential.isEmpty()) {
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93 continue;
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94 }
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95
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96 center.x = x; center.y = y;
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97 Collections.sort(potential, invL1);
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98
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99 neighbors[0] = neighbors[1] =
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100 neighbors[2] = neighbors[3] = null;
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101
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102 int mask = 0;
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103 // reversed order is essential here!
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104 for (int k = potential.size()-1; k >= 0; --k) {
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105 Point2d n = (Point2d)potential.get(k);
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106 int code = n.x > center.x ? 1 : 0;
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107 if (n.y > center.y) code |= 2;
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108 neighbors[code] = n;
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109 mask |= 1 << code;
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110 }
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111
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112 int numNeighbors = Integer.bitCount(mask);
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113
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114 // only interpolate if we have all four neighbors
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115 // we do not have any gaps and we are below surface.
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116 if (numNeighbors == 4
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117 && !neighbors[0].hasIGap(neighbors[1])
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parents:
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118 && !neighbors[1].hasJGap(neighbors[3])
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parents:
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119 && !neighbors[3].hasIGap(neighbors[2])
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120 && !neighbors[2].hasJGap(neighbors[0])
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parents:
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121 && depth.depth(center) <= 0d
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parents:
diff changeset
122 ) {
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123 double z1 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 neighbors[0].x, neighbors[0].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
125 neighbors[1].x, neighbors[1].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
126 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
127 double z2 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
128 neighbors[2].x, neighbors[2].z,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
129 neighbors[3].x, neighbors[3].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
130 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
131 double y1 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132 neighbors[0].x, neighbors[0].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
133 neighbors[1].x, neighbors[1].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134 center.x);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
135 double y2 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 neighbors[2].x, neighbors[2].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137 neighbors[3].x, neighbors[3].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 center.x);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 raster[row+i] = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 y1, z1,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 y2, z2,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 center.y);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
144 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147 this.raster = raster;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 this.width = W;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 this.height = H;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 return true;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org