Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/DischargeTables.java @ 9726:0a5239a1e46e 3.2.x

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Upgrade to Log4j 2
author Tom Gottfried <tom@intevation.de>
date Wed, 02 Mar 2022 10:26:50 +0100
parents e4606eae8ea5
children
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
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parents: 5838
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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;
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10
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11 import java.util.List;
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12 import java.util.Map;
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13 import java.util.HashMap;
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14 import java.util.Arrays;
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15
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16 import java.io.Serializable;
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17
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18 import org.hibernate.Session;
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19 import org.hibernate.Query;
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20
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21 import org.apache.logging.log4j.Logger;
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22 import org.apache.logging.log4j.LogManager;
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23
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24 import org.dive4elements.river.backend.SessionHolder;
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25 import org.dive4elements.river.model.Gauge;
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26 import org.dive4elements.river.model.DischargeTable;
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27 import org.dive4elements.river.model.DischargeTableValue;
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28
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29 import gnu.trove.TDoubleArrayList;
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30
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31 /** Documentation goes here. */
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32 public class DischargeTables
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33 implements Serializable
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34 {
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35 /** Private log. */
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36 private static Logger log = LogManager.getLogger(DischargeTables.class);
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37
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38 public static final int MASTER = 0;
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39
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40 protected List<String> gaugeNames;
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41
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42 protected String riverName;
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43
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44 protected int kind;
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45
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46 protected Map<String, double [][]> values;
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47
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48 public DischargeTables() {
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49 }
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50
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51 public DischargeTables(String riverName, String gaugeName) {
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52 this(riverName, gaugeName, MASTER);
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53 }
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54
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55 public DischargeTables(String riverName, String gaugeName, int kind) {
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56 this(riverName, new String [] { gaugeName }, kind);
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57 }
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58
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59 public DischargeTables(String riverName, String [] gaugeNames) {
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60 this(riverName, gaugeNames, MASTER);
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61 }
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62
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63 public DischargeTables(String riverName, String [] gaugeNames, int kind) {
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64 this(riverName, Arrays.asList(gaugeNames), kind);
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65 }
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66
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67 public DischargeTables(
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68 String riverName,
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69 List<String> gaugeNames,
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70 int kind
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71 ) {
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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 Map<String, double [][]> values = getValues();
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79 for (double [][] table: values.values()) {
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80 return table;
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81 }
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82 return null;
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83 }
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84
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85 public Map<String, double [][]> getValues() {
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86 if (values == null) {
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87 values = loadValues();
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88 }
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89 return values;
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90 }
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91
1929
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92 /**
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93 * Returns mapping of gauge name to values.
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94 */
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95 protected Map<String, double [][]> loadValues() {
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96 Map<String, double [][]> values = new HashMap<String, double [][]>();
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97
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98 Session session = SessionHolder.HOLDER.get();
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99
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100 Query gaugeQuery = session.createQuery(
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101 "from Gauge where name=:gauge and river.name=:river");
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102 gaugeQuery.setParameter("river", riverName);
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103
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104 for (String gaugeName: gaugeNames) {
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105 gaugeQuery.setParameter("gauge", gaugeName);
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106 List<Gauge> gauges = gaugeQuery.list();
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107 if (gauges.isEmpty()) {
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108 log.warn(
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109 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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110 continue;
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111 }
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112 Gauge gauge = gauges.get(0);
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113
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114 List<DischargeTable> tables = gauge.getDischargeTables();
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115
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116 if (tables.isEmpty()) {
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117 log.warn(
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118 "no discharge table for gauge '" + gaugeName + "'");
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119 continue;
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
120 }
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
121
311
ea3a438a7021 Backend access: Static methods are using the SessionHolder, too.
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parents: 154
diff changeset
122 // TODO: Filter by time interval
4919
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
123 DischargeTable table = null;
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
124 for (DischargeTable dt : tables) {
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
125 if (dt.getKind() == 0) {
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
126 table = dt;
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
127 break;
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
128 }
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
129 }
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
130 if (table == null) {
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
131 table = tables.get(0);
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
132 }
6301
20a32dbdbb59 Remove discharge table scaling but add reference system to W
Andre Heinecke <aheinecke@intevation.de>
parents: 5994
diff changeset
133 double [][] vs = loadDischargeTableValues(table);
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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parents: 328
diff changeset
134
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diff changeset
135 values.put(gaugeName, vs);
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
136 }
311
ea3a438a7021 Backend access: Static methods are using the SessionHolder, too.
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parents: 154
diff changeset
137
ea3a438a7021 Backend access: Static methods are using the SessionHolder, too.
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parents: 154
diff changeset
138 return values;
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
139 }
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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parents: 328
diff changeset
140
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
141
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
142 /**
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
143 * @param table The discharge table
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
144 *
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
145 * @return the values of a discharge table.
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
146 */
6301
20a32dbdbb59 Remove discharge table scaling but add reference system to W
Andre Heinecke <aheinecke@intevation.de>
parents: 5994
diff changeset
147 public static double[][] loadDischargeTableValues(DischargeTable table) {
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
148 List<DischargeTableValue> dtvs = table.getDischargeTableValues();
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
149
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
150 final double [][] vs = new double[2][dtvs.size()];
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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parents: 1929
diff changeset
151
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
152 int idx = 0;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
153 for (DischargeTableValue dtv: dtvs) {
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
154 double q = dtv.getQ().doubleValue();
6301
20a32dbdbb59 Remove discharge table scaling but add reference system to W
Andre Heinecke <aheinecke@intevation.de>
parents: 5994
diff changeset
155 vs[0][idx] = q;
20a32dbdbb59 Remove discharge table scaling but add reference system to W
Andre Heinecke <aheinecke@intevation.de>
parents: 5994
diff changeset
156 vs[1][idx] = dtv.getW().doubleValue();
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
157 ++idx;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
158 }
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
159
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
160 return vs;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
161 }
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
162
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parents: 2230
diff changeset
163 private static final double EPSILON = 1e-5;
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
164
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parents: 2230
diff changeset
165 private static final boolean epsEquals(double a, double b) {
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parents: 2230
diff changeset
166 return Math.abs(a - b) < EPSILON;
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parents: 2230
diff changeset
167 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
168
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parents: 2230
diff changeset
169 private static final boolean between(double a, double b, double x) {
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parents: 2230
diff changeset
170 if (a > b) { double t = a; a = b; b = t; }
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parents: 2230
diff changeset
171 return x > a && x < b;
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parents: 2230
diff changeset
172 }
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parents: 2230
diff changeset
173
5340
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
174 /**
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
175 * Find or interpolate Qs from q/w array.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
176 * @param values [[q0,q1,q2],[w0,w1,w2]]
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
177 * @param w W value to look for in values.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
178 */
2418
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parents: 2230
diff changeset
179 public static double [] getQsForW(double [][] values, double w) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
diff changeset
180
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
diff changeset
181 boolean debug = log.isDebugEnabled();
20c3a5b36434 Repaired DischargeTables.getQForW()
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parents: 376
diff changeset
182
20c3a5b36434 Repaired DischargeTables.getQForW()
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parents: 376
diff changeset
183 if (debug) {
2418
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parents: 2230
diff changeset
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.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 328
diff changeset
185 }
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 328
diff changeset
186
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parents: 2230
diff changeset
187 double [] qs = values[0];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
188 double [] ws = values[1];
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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parents: 328
diff changeset
189
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parents: 2230
diff changeset
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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parents: 328
diff changeset
191
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parents: 2230
diff changeset
192 if (N == 0) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
diff changeset
193 if (debug) {
2418
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
194 log.debug("Q(" + w + ") = []");
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
195 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
196 return new double [0];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
197 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
198
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
199 TDoubleArrayList outQs = new TDoubleArrayList();
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
200
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
201 if (epsEquals(ws[0], w)) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
202 outQs.add(qs[0]);
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
203 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
204
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
205 for (int i = 1; i < N; ++i) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
206 if (epsEquals(ws[i], w)) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
207 outQs.add(qs[i]);
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
208 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
209 else if (between(ws[i-1], ws[i], w)) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
210 double w1 = ws[i-1];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
211 double w2 = ws[i];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
212 double q1 = qs[i-1];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
213 double q2 = qs[i];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
214
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
215 // q1 = m*w1 + b
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
216 // q2 = m*w2 + b
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
217 // q2 - q1 = m*(w2 - w1)
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
218 // m = (q2 - q1)/(w2 - w1) # w2 != w1
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
219 // b = q1 - m*w1
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
220 // w1 != w2
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
221
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
222 double m = (q2 - q1)/(w2 - w1);
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
223 double b = q1 - m*w1;
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
224 double q = w*m + b;
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
225
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
226 outQs.add(q);
378
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
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.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 328
diff changeset
228 }
2418
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parents: 2230
diff changeset
229
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
230 double [] result = outQs.toNativeArray();
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parents: 2230
diff changeset
231
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
232 if (debug) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
233 log.debug("Q(" + w + ") = " + Arrays.toString(result));
378
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
diff changeset
234 }
2418
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parents: 2230
diff changeset
235
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
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.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 328
diff changeset
237 }
4226
cb9f22c3553f DischargeTables: Added missing getWsForQ()
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4138
diff changeset
238
cb9f22c3553f DischargeTables: Added missing getWsForQ()
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4138
diff changeset
239 public static double [] getWsForQ(double [][] values, double q) {
cb9f22c3553f DischargeTables: Added missing getWsForQ()
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4138
diff changeset
240
cb9f22c3553f DischargeTables: Added missing getWsForQ()
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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