Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DischargeTables.java @ 4226:cb9f22c3553f

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DischargeTables: Added missing getWsForQ()
author Sascha L. Teichmann <teichmann@intevation.de>
date Tue, 23 Oct 2012 15:05:17 +0200
parents 1d9c9a3493ea
children dbe9b7d6b80b
rev   line source
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.util.List;
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4 import java.util.Map;
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5 import java.util.HashMap;
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6 import java.util.Arrays;
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7
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8 import java.io.Serializable;
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10 import org.hibernate.Session;
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11 import org.hibernate.Query;
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13 import org.apache.log4j.Logger;
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15 import de.intevation.flys.backend.SessionHolder;
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16 import de.intevation.flys.model.Gauge;
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17 import de.intevation.flys.model.DischargeTable;
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18 import de.intevation.flys.model.DischargeTableValue;
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19
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20 import gnu.trove.TDoubleArrayList;
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21
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22 /** Documentation goes here. */
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23 public class DischargeTables
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24 implements Serializable
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25 {
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26 /** Private logger. */
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27 private static Logger log = Logger.getLogger(DischargeTables.class);
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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28
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29 /** Scale to convert discharge table values of master table into [cm] */
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30 public static final double MASTER_SCALE = 100d;
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31
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32 /** Scale to convert discharge table values of historical tables into [cm] */
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33 public static final double HISTORICAL_SCALE = 1d;
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35 public static final int MASTER = 0;
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37 protected List<String> gaugeNames;
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38
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39 protected String riverName;
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41 protected double scale;
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42
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43 protected int kind;
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44
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45 protected Map<String, double [][]> values;
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47 public DischargeTables() {
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48 }
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49
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50 public DischargeTables(String riverName, String gaugeName) {
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51 this(riverName, gaugeName, MASTER);
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52 }
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53
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54 public DischargeTables(String riverName, String gaugeName, int kind) {
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55 this(riverName, new String [] { gaugeName }, kind);
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56 }
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58 public DischargeTables(String riverName, String [] gaugeNames) {
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59 this(riverName, gaugeNames, MASTER);
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60 }
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62 public DischargeTables(String riverName, String [] gaugeNames, int kind) {
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63 this(riverName, Arrays.asList(gaugeNames), kind);
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64 }
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66 public DischargeTables(
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67 String riverName,
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68 List<String> gaugeNames,
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69 int kind
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70 ) {
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71 scale = Double.NaN;
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72 this.kind = kind;
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73 this.riverName = riverName;
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74 this.gaugeNames = gaugeNames;
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75 }
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76
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77 public double [][] getFirstTable() {
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78 return getFirstTable(MASTER_SCALE);
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79 }
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81 public double [][] getFirstTable(double scale) {
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82 Map<String, double [][]> values = getValues(scale);
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83 for (double [][] table: values.values()) {
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84 return table;
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85 }
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86 return null;
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87 }
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89 public Map<String, double [][]> getValues() {
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90 return getValues(MASTER_SCALE);
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91 }
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92
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93 public Map<String, double [][]> getValues(double scale) {
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94 if (values == null || scale != this.scale) {
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95 values = loadValues(scale);
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96 this.scale = scale;
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97 }
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98 return values;
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99 }
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100
1929
6b0ae0f2cae6 (Minor) cosmetics, docs.
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101 /**
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102 * Returns mapping of gauge name to values.
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103 */
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104 protected Map<String, double [][]> loadValues(double scale) {
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105 Map<String, double [][]> values = new HashMap<String, double [][]>();
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106
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107 Session session = SessionHolder.HOLDER.get();
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108
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109 Query gaugeQuery = session.createQuery(
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110 "from Gauge where name=:gauge and river.name=:river");
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111 gaugeQuery.setParameter("river", riverName);
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112
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113 for (String gaugeName: gaugeNames) {
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114 gaugeQuery.setParameter("gauge", gaugeName);
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115 List<Gauge> gauges = gaugeQuery.list();
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116 if (gauges.isEmpty()) {
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117 log.warn(
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118 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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119 continue;
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120 }
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121 Gauge gauge = gauges.get(0);
146
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122
311
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123 List<DischargeTable> tables = gauge.getDischargeTables();
146
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124
311
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125 if (tables.isEmpty()) {
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126 log.warn(
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127 "no discharge table for gauge '" + gaugeName + "'");
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128 continue;
146
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parents:
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129 }
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130
311
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131 // TODO: Filter by time interval
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132 DischargeTable table = tables.get(0);
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133
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134 double [][] vs = loadDischargeTableValues(table, scale);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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135
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136 values.put(gaugeName, vs);
146
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137 }
311
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138
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139 return values;
146
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140 }
329
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141
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142
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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143 /**
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144 * @param table The discharge table
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145 * @param scale The scale factor to adjust W and Q values.
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146 *
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147 * @return the values of a discharge table.
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148 */
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149 public static double[][] loadDischargeTableValues(
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150 DischargeTable table,
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151 double scale
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152 ) {
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153 List<DischargeTableValue> dtvs = table.getDischargeTableValues();
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154
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155 final double [][] vs = new double[2][dtvs.size()];
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156
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diff changeset
157 int idx = 0;
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158 for (DischargeTableValue dtv: dtvs) {
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diff changeset
159 double q = dtv.getQ().doubleValue();
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diff changeset
160 vs[0][idx] = q * scale;
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diff changeset
161 vs[1][idx] = dtv.getW().doubleValue() * scale;
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diff changeset
162 ++idx;
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163 }
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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164
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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165 return vs;
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166 }
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167
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168 private static final double EPSILON = 1e-5;
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169
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170 private static final boolean epsEquals(double a, double b) {
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171 return Math.abs(a - b) < EPSILON;
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172 }
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173
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174 private static final boolean between(double a, double b, double x) {
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175 if (a > b) { double t = a; a = b; b = t; }
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176 return x > a && x < b;
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177 }
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178
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179 public static double [] getQsForW(double [][] values, double w) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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180
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181 boolean debug = log.isDebugEnabled();
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182
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183 if (debug) {
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184 log.debug("getQsForW: W = " + w);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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185 }
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186
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187 double [] qs = values[0];
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188 double [] ws = values[1];
329
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189
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190 int N = Math.min(qs.length, ws.length);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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191
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192 if (N == 0) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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diff changeset
193 if (debug) {
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194 log.debug("Q(" + w + ") = []");
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195 }
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diff changeset
196 return new double [0];
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197 }
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diff changeset
198
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diff changeset
199 TDoubleArrayList outQs = new TDoubleArrayList();
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diff changeset
200
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diff changeset
201 if (epsEquals(ws[0], w)) {
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diff changeset
202 outQs.add(qs[0]);
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diff changeset
203 }
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diff changeset
204
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diff changeset
205 for (int i = 1; i < N; ++i) {
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diff changeset
206 if (epsEquals(ws[i], w)) {
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diff changeset
207 outQs.add(qs[i]);
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diff changeset
208 }
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diff changeset
209 else if (between(ws[i-1], ws[i], w)) {
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diff changeset
210 double w1 = ws[i-1];
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diff changeset
211 double w2 = ws[i];
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diff changeset
212 double q1 = qs[i-1];
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diff changeset
213 double q2 = qs[i];
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diff changeset
214
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diff changeset
215 // q1 = m*w1 + b
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diff changeset
216 // q2 = m*w2 + b
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diff changeset
217 // q2 - q1 = m*(w2 - w1)
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diff changeset
218 // m = (q2 - q1)/(w2 - w1) # w2 != w1
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diff changeset
219 // b = q1 - m*w1
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diff changeset
220 // w1 != w2
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diff changeset
221
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diff changeset
222 double m = (q2 - q1)/(w2 - w1);
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diff changeset
223 double b = q1 - m*w1;
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diff changeset
224 double q = w*m + b;
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diff changeset
225
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diff changeset
226 outQs.add(q);
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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diff changeset
227 }
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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diff changeset
228 }
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diff changeset
229
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diff changeset
230 double [] result = outQs.toNativeArray();
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diff changeset
231
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232 if (debug) {
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233 log.debug("Q(" + w + ") = " + Arrays.toString(result));
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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234 }
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235
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236 return result;
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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237 }
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238
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239 public static double [] getWsForQ(double [][] values, double q) {
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240
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241 boolean debug = log.isDebugEnabled();
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242
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243 if (debug) {
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244 log.debug("getWsForQ: W = " + q);
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245 }
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246
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247 double [] qs = values[0];
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248 double [] ws = values[1];
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249
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250 int N = Math.min(qs.length, ws.length);
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251
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252 if (N == 0) {
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253 if (debug) {
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254 log.debug("W(" + q + ") = []");
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255 }
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256 return new double [0];
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257 }
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258
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259 TDoubleArrayList outWs = new TDoubleArrayList();
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260
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261 if (epsEquals(qs[0], q)) {
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262 outWs.add(ws[0]);
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263 }
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264
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265 for (int i = 1; i < N; ++i) {
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266 if (epsEquals(qs[i], q)) {
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267 outWs.add(ws[i]);
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268 }
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269 else if (between(qs[i-1], qs[i], q)) {
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270 double w1 = ws[i-1];
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271 double w2 = ws[i];
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272 double q1 = qs[i-1];
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273 double q2 = qs[i];
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274
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275 // w1 = m*q1 + b
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276 // w2 = m*q2 + b
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277 // w2 - w1 = m*(q2 - q1)
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278 // m = (w2 - w1)/(q2 - q1) # q2 != q1
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279 // b = w1 - m*q1
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280 // q1 != q2
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281
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282 double m = (w2 - w1)/(q2 - q1);
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283 double b = w1 - m*q1;
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284 double w = q*m + b;
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285
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286 outWs.add(w);
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287 }
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288 }
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289
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290 double [] result = outWs.toNativeArray();
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291
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292 if (debug) {
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293 log.debug("W(" + q + ") = " + Arrays.toString(result));
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294 }
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295
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296 return result;
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297 }
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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298 }
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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299 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org