Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentDensity.java @ 7460:2733b4aae74b
flys/issue1625: Changed default sediment density factor from 1.8 to 1.9 . The value can be changed by adusting conf.xml (/artifact-databae/options/sediment-density-factor/text()).
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Tue, 29 Oct 2013 19:46:41 +0100 |
parents | 2facd4066a28 |
children | 52c364813cb1 |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.model.minfo; |
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10 |
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11 import java.io.Serializable; |
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12 |
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13 import java.util.ArrayList; |
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14 import java.util.Collections; |
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15 import java.util.HashMap; |
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16 import java.util.List; |
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17 import java.util.Map; |
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18 import java.util.Set; |
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19 import java.util.TreeMap; |
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20 |
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21 import org.apache.log4j.Logger; |
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22 |
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23 import org.dive4elements.artifacts.common.utils.Config; |
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24 |
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25 |
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26 /** Sediment Densities for multiple years. */ |
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27 public class SedimentDensity implements Serializable |
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28 { |
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29 private static final Logger logger = Logger |
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30 .getLogger(SedimentDensity.class); |
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31 |
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32 public static final double DEFAULT_SEDIMNET_DENSITY_FACTOR = 1.9; |
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33 |
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34 public static String SEDIMENT_DENSITY_FACTOR_XPATH = |
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35 "/artifact-database/options/sediment-density-factor/text()"; |
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36 |
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37 public static final double SEDIMNET_DENSITY_FACTOR = |
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38 getSedimentDensityFactor(); |
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39 |
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40 private Map<Integer, List<SedimentDensityValue>> densities; |
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41 private List<Integer> years; |
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42 |
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43 |
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44 /** Figures out the sediment density factor from global config. */ |
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45 private static final double getSedimentDensityFactor() { |
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46 |
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47 double factor = DEFAULT_SEDIMNET_DENSITY_FACTOR; |
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48 |
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49 String factorString = |
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50 Config.getStringXPath(SEDIMENT_DENSITY_FACTOR_XPATH); |
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51 |
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52 if (factorString != null) { |
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53 try { |
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54 factor = Double.parseDouble(factorString.trim()); |
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55 } |
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56 catch (NumberFormatException nfe) { |
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57 logger.error(nfe); |
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58 } |
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59 } |
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60 |
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61 logger.info("Sedmiment density factor: " + factor); |
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62 |
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63 return factor; |
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64 } |
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65 |
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66 public SedimentDensity() { |
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67 this.densities = new HashMap<Integer, List<SedimentDensityValue>>(); |
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68 this.years = new ArrayList<Integer>(); |
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69 } |
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70 |
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71 public Map<Integer, List<SedimentDensityValue>> getDensities() { |
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72 return densities; |
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73 } |
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74 |
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75 public void setDensities(Map<Integer, List<SedimentDensityValue>> densities) { |
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76 this.densities = densities; |
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77 } |
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78 |
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79 public void addDensity(double km, double density, int year) { |
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80 logger.debug("adding " + year); |
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81 if (this.densities.containsKey(year)) { |
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82 List<SedimentDensityValue> list = this.densities.get(year); |
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83 list.add(new SedimentDensityValue(km, density, year)); |
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84 } |
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85 else { |
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86 List<SedimentDensityValue> list = |
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87 new ArrayList<SedimentDensityValue>(); |
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88 list.add(new SedimentDensityValue(km, density, year)); |
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89 densities.put(year, list); |
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90 } |
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91 if (!this.years.contains(new Integer(year))) { |
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92 logger.debug("new year"); |
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93 years.add(new Integer(year)); |
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94 } |
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95 } |
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96 |
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97 public List<Integer> getYears() { |
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98 return years; |
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99 } |
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100 |
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101 public void setYears(List<Integer> years) { |
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102 this.years = years; |
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103 } |
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104 |
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105 /** |
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106 * Get the density at year. |
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107 * Measured densities are valid until the next measurement. |
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108 * If no measurement was found 1.8 is returned. |
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109 */ |
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110 public double getDensity(double km, int year) { |
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111 Collections.sort(this.years); |
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112 if (this.years.size() == 1 && years.get(0) <= year) { |
6910 | 113 logger.debug("get density from year " + year + " at km " + km); |
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114 return getDensityAtKm(densities.get(years.get(0)), km); |
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115 } |
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116 if (this.years.size() > 1) { |
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117 for (int i = 0, I = years.size()-1; i < I; i++) { |
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118 int y1 = years.get(i); |
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119 int y2 = years.get(i + 1); |
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120 if (year >= y1 && year < y2) { |
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121 return getDensityAtKm(densities.get(y1), km); |
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122 } |
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123 else if (year >= y2 && i == years.size() -1) { |
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124 return getDensityAtKm(densities.get(y2), km); |
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125 } |
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126 } |
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127 } |
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128 return SEDIMNET_DENSITY_FACTOR; |
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129 } |
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130 |
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131 /** Get (sorted) map of km to density of all years. */ |
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132 public double[][] getAllDensities() |
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133 { |
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134 TreeMap<Double, Double> map = new TreeMap<Double,Double>(); |
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135 for (int year: years) { |
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136 for (SedimentDensityValue sdv: densities.get(year)) { |
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137 map.put(sdv.getKm(), sdv.getDensity()); |
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138 } |
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139 } |
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140 double[][] points = new double[2][map.keySet().size()]; |
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141 int i = 0; |
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142 for (Map.Entry<Double, Double> kmDens: map.entrySet()) { |
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143 points[0][i] = kmDens.getKey(); |
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144 points[1][i] = kmDens.getValue(); |
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145 i++; |
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146 } |
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147 |
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148 return points; |
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149 } |
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150 |
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151 /** Get points km,density (sorted by km), for a given year. */ |
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152 public double[][] getDensities(int year) |
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153 { |
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154 TreeMap<Double, Double> map = new TreeMap<Double,Double>(); |
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155 for (SedimentDensityValue sdv: densities.get(year)) { |
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156 map.put(sdv.getKm(), sdv.getDensity()); |
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157 } |
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158 double[][] points = new double[2][map.keySet().size()]; |
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159 int i = 0; |
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160 for (Map.Entry<Double, Double> kmDens: map.entrySet()) { |
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161 points[0][i] = kmDens.getKey(); |
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162 points[1][i] = kmDens.getValue(); |
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163 i++; |
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164 } |
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165 |
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166 return points; |
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167 } |
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168 |
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169 /** Get value at km, interpolated. */ |
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170 private double getDensityAtKm( |
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171 List<SedimentDensityValue> values, |
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172 double km |
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173 ) { |
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174 SedimentDensityValue prev = null; |
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175 SedimentDensityValue next = null; |
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176 for (SedimentDensityValue sdv: values) { |
6910 | 177 logger.debug("year: " + sdv.getYear()); |
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178 if (Math.abs(sdv.getKm() - km) < 0.00001) { |
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179 return prev.getDensity(); |
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180 } |
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181 if (sdv.getKm() > km) { |
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182 next = sdv; |
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183 break; |
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184 } |
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185 prev = sdv; |
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186 } |
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187 return spline(prev, next, km); |
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188 } |
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189 |
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190 /** Linearly interpolate between density values. */ |
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191 private static double spline( |
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192 SedimentDensityValue prev, |
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193 SedimentDensityValue next, |
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194 double km |
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195 ) { |
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196 if (prev == null && next == null) { |
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197 logger.warn("prev and next are null -> NaN"); |
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198 return Double.NaN; |
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199 } |
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200 |
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201 if (prev == null) return next.getDensity(); |
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202 if (next == null) return prev.getDensity(); |
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203 |
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204 // XXX: This is no spline interpolation! |
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205 double lower = prev.getKm(); |
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206 double upper = next.getKm(); |
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207 double upperDensity = next.getDensity(); |
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208 double lowerDensity = prev.getDensity(); |
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209 |
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210 double m = (upperDensity - lowerDensity)/(upper - lower); |
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211 double b = lowerDensity - (m * lower); |
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212 return m * km + b; |
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213 } |
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214 |
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215 |
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216 /** If multiple values for same year and station are found, |
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217 * build and store average, dismiss multiple values. */ |
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218 public void cleanUp() { |
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219 Set<Integer> keys = densities.keySet(); |
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220 // Walk over years |
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221 for (Integer key : keys) { |
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222 List<SedimentDensityValue> list = densities.get(key); |
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223 if (list.size() == 0) { |
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224 return; |
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225 } |
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226 List<SedimentDensityValue> cleaned = |
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227 new ArrayList<SedimentDensityValue>(); |
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228 double prevkm = list.get(0).getKm(); |
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229 int counter = 0; |
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230 double sum = 0d; |
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231 for (SedimentDensityValue value : list) { |
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232 // Apparently we can assume that values are ordered by km. |
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233 if (value.getKm() == prevkm) { |
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234 sum += value.getDensity(); |
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235 counter++; |
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236 } |
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237 else { |
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238 cleaned.add(new SedimentDensityValue( |
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239 prevkm, |
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240 sum / counter, |
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241 value.getYear())); |
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242 sum = value.getDensity(); |
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243 counter = 1; |
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244 } |
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245 prevkm = value.getKm(); |
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246 } |
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247 this.densities.put(key, cleaned); |
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248 } |
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249 } |
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250 } |
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251 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |