Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/XYColumn.java @ 434:0eed5749fd63

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Implemented the raster interpolation for the 'Profilschnitt'. gnv-artifacts/trunk@482 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 23 Dec 2009 15:28:40 +0000
parents 828df3ddb758
children eb2ac62e853a
rev   line source
427
a95aaeb206f7 Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
1 package de.intevation.gnv.math;
a95aaeb206f7 Added data model classes to store information for interpolation.
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2
a95aaeb206f7 Added data model classes to store information for interpolation.
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3 import java.util.ArrayList;
a95aaeb206f7 Added data model classes to store information for interpolation.
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4 import java.util.List;
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828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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5 import java.util.Collections;
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6
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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7 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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8 import org.apache.commons.math.analysis.interpolation.UnivariateRealInterpolator;
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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9
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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10 import org.apache.commons.math.analysis.polynomials.PolynomialSplineFunction;
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11
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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12 import org.apache.commons.math.analysis.UnivariateRealFunction;
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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13
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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14 import org.apache.commons.math.MathException;
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15 import org.apache.commons.math.FunctionEvaluationException;
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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16
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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17 import org.apache.log4j.Logger;
427
a95aaeb206f7 Added data model classes to store information for interpolation.
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18
a95aaeb206f7 Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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19 /**
a95aaeb206f7 Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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20 * @author Ingo Weinzierl <ingo.weinzierl@intevation.de>
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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21 * @author Sascha L. Teichmann <sascha.teichmann@intevation.de>
427
a95aaeb206f7 Added data model classes to store information for interpolation.
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22 */
429
bed9735adf84 Finished preprocessing data for interpolation in verticalcrosssection charts.ß
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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23 public class XYColumn
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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24 extends Point2d
433
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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25 implements UnivariateRealFunction
429
bed9735adf84 Finished preprocessing data for interpolation in verticalcrosssection charts.ß
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 427
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26 {
434
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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27 private static Logger log = Logger.getLogger(XYColumn.class);
433
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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28
432
6a70e8883307 Added some type safety. Fixed z value bug in reading database preprocessing. Only dissemble WKT points if really needed.
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29 protected List<HeightValue> values;
427
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30
433
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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31 protected transient UnivariateRealFunction curve;
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32
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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33 public XYColumn() {
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828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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34 values = new ArrayList<HeightValue>();
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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parents: 429
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35 }
427
a95aaeb206f7 Added data model classes to store information for interpolation.
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36
a95aaeb206f7 Added data model classes to store information for interpolation.
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37 public XYColumn(double x, double y, int i, int j) {
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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38 super(x, y, i, j);
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39 values = new ArrayList<HeightValue>();
427
a95aaeb206f7 Added data model classes to store information for interpolation.
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40 }
a95aaeb206f7 Added data model classes to store information for interpolation.
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41
a95aaeb206f7 Added data model classes to store information for interpolation.
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42 public void add(HeightValue value) {
a95aaeb206f7 Added data model classes to store information for interpolation.
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43 values.add(value);
a95aaeb206f7 Added data model classes to store information for interpolation.
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44 }
a95aaeb206f7 Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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45
432
6a70e8883307 Added some type safety. Fixed z value bug in reading database preprocessing. Only dissemble WKT points if really needed.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 431
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46 public List<HeightValue> getValues() {
6a70e8883307 Added some type safety. Fixed z value bug in reading database preprocessing. Only dissemble WKT points if really needed.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 431
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47 return values;
427
a95aaeb206f7 Added data model classes to store information for interpolation.
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48 }
433
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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49
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50 public double value(double depth) {
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51 try {
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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52 if (curve != null) {
434
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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53 HeightValue h = values.get(0);
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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54 // extrapolate beyond boundaries by repeating
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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55 if (depth > h.z) return h.v;
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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parents: 433
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56 h = values.get(values.size()-1);
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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parents: 433
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57 if (depth < h.z) return h.v;
433
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58 return curve.value(depth);
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59 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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60 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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61 catch (FunctionEvaluationException fee) {
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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62 log.error("evaluation failed", fee);
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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parents: 432
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63 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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parents: 432
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64
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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65 return Double.NaN;
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66 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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67
434
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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68 public boolean prepare(XYDepth xyDepth) {
433
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69 int N = values.size();
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70 if (curve == null && N > 0) {
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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71 if (N == 1) {
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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72 // only one value -> constant function
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73 curve = new ConstantFunction(values.get(0).v);
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74 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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75 else { // more than on value
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76 double depth = xyDepth.depth(this);
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77 Collections.sort(values, HeightValue.INV_Z_COMPARATOR);
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78
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79 // if there is no value at 0 repeat first value
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80 HeightValue first = values.get(0);
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81 if (first.z < 0d) {
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82 values.add(0, new HeightValue(0d, first.z, first.k-1));
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83 }
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84
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85 // if there is no value at depth repeat last value
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86 HeightValue last = values.get(N-1);
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87 if (last.z > depth) {
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88 values.add(new HeightValue(depth, last.z, last.k+1));
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89 }
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90 N = values.size();
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91 if (N < 3) { // interpolate linear
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92 first = values.get(0);
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93 last = values.get(N-1);
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94 curve = new LinearFunction.Univariate(
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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95 first.z, first.v,
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96 last.z, last.v);
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97 }
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98 else { // higher degree interpolation
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99 double [] z = new double[N];
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100 double [] v = new double[N];
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101 for (int i = 0; i < N; ++i) {
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102 HeightValue h = values.get(i);
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103 z[i] = h.z;
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104 v[i] = h.v;
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105 }
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106 try {
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107 curve = getInterpolator().interpolate(z, v);
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108 }
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109 catch (MathException me) {
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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110 log.error("interpolation failed", me);
434
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111 return false;
433
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112 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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113 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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114 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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115 }
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116 else {
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117 log.error("no points for interpolation");
434
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118 return false;
433
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119 }
434
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
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120 return true;
433
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121 }
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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122
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123 protected UnivariateRealInterpolator getInterpolator() {
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124 return new SplineInterpolator();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 432
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125 }
427
a95aaeb206f7 Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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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: 429
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127 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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