Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/XYColumn.java @ 592:3c939c95c477
Removed accidental checkin of Test-Shapefiles
gnv-artifacts/trunk@647 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Fri, 29 Jan 2010 13:28:28 +0000 |
parents | bc5901bb4525 |
children | b1f5f2a8840f |
rev | line source |
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1 package de.intevation.gnv.math; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.List; |
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5 import java.util.Collections; |
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6 |
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7 import org.apache.commons.math.analysis.interpolation.SplineInterpolator; |
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8 import org.apache.commons.math.analysis.interpolation.UnivariateRealInterpolator; |
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9 |
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10 import org.apache.commons.math.analysis.UnivariateRealFunction; |
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11 |
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12 import org.apache.commons.math.MathException; |
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13 import org.apache.commons.math.FunctionEvaluationException; |
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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 Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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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 XYColumn |
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22 extends Point2d |
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23 implements UnivariateRealFunction |
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24 { |
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25 private static Logger log = Logger.getLogger(XYColumn.class); |
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26 |
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27 protected List<HeightValue> values; |
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28 |
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29 protected transient UnivariateRealFunction curve; |
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30 |
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31 public XYColumn() { |
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32 values = new ArrayList<HeightValue>(); |
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33 } |
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34 |
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35 public XYColumn(double x, double y, int i, int j) { |
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36 super(x, y, i, j); |
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37 values = new ArrayList<HeightValue>(); |
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38 } |
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39 |
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40 public void add(HeightValue value) { |
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41 values.add(value); |
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42 } |
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43 |
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44 public List<HeightValue> getValues() { |
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45 return values; |
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46 } |
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47 |
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48 public double value(double depth) { |
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49 try { |
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50 if (curve != null) { |
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51 HeightValue h = values.get(0); |
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52 // extrapolate beyond boundaries by repeating |
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53 if (depth > h.z) return h.v; |
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54 h = values.get(values.size()-1); |
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55 if (depth < h.z) return h.v; |
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56 return curve.value(depth); |
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57 } |
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58 } |
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59 catch (FunctionEvaluationException fee) { |
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60 log.error("evaluation failed", fee); |
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61 } |
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62 |
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63 return Double.NaN; |
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64 } |
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65 |
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66 public boolean prepare(XYDepth xyDepth) { |
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67 if (curve == null) { |
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68 int N = values.size(); |
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69 if (N == 0) { |
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70 log.error("no points for interpolation"); |
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71 return false; |
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72 } |
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73 |
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74 if (N == 1) { |
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75 // only one value -> constant function |
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76 curve = new ConstantFunction(values.get(0).v); |
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77 } |
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78 else { // more than on value |
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79 double depth = xyDepth.depth(this); |
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80 Collections.sort(values, HeightValue.INV_Z_COMPARATOR); |
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81 |
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82 // if there is no value at 0 repeat first value |
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83 HeightValue first = values.get(0); |
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84 if (first.z < 0d) { |
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85 values.add(0, new HeightValue(0d, first.v, first.k-1)); |
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86 ++N; |
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87 } |
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88 |
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89 // if there is no value at depth repeat last value |
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90 HeightValue last = values.get(N-1); |
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91 if (last.z > depth) { |
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92 values.add(new HeightValue(depth, last.v, last.k+1)); |
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93 ++N; |
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94 } |
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95 if (N < 3) { // interpolate linear |
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96 first = values.get(0); |
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97 last = values.get(N-1); |
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98 curve = new LinearFunction.Univariate( |
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99 first.z, first.v, |
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100 last.z, last.v); |
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101 } |
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102 else { // higher degree interpolation |
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103 double [] z = new double[N]; |
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104 double [] v = new double[N]; |
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105 for (int i = 0; i < N; ++i) { |
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106 HeightValue h = values.get(N-1-i); |
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107 z[i] = h.z; |
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Added interpolation capabilities along z axis to XYColumns.
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108 v[i] = h.v; |
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109 } |
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Added interpolation capabilities along z axis to XYColumns.
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110 try { |
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111 curve = getInterpolator().interpolate(z, v); |
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parents:
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112 } |
828df3ddb758
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113 catch (MathException me) { |
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114 log.error("interpolation failed", me); |
434
0eed5749fd63
Implemented the raster interpolation for the 'Profilschnitt'.
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115 return false; |
433
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parents:
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116 } |
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Added interpolation capabilities along z axis to XYColumns.
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parents:
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117 } |
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parents:
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118 } |
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Added interpolation capabilities along z axis to XYColumns.
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parents:
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119 } |
434
0eed5749fd63
Implemented the raster interpolation for the 'Profilschnitt'.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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120 return true; |
433
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Added interpolation capabilities along z axis to XYColumns.
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121 } |
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Added interpolation capabilities along z axis to XYColumns.
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parents:
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122 |
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Added interpolation capabilities along z axis to XYColumns.
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parents:
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123 protected UnivariateRealInterpolator getInterpolator() { |
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124 return new SplineInterpolator(); |
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125 } |
427
a95aaeb206f7
Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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126 } |
431
422275fc9927
Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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127 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |