annotate pkg/imports/isr.go @ 4256:4ca884dfc470

Prevent heights duplicates in iso line calculations.
author Sascha L. Teichmann <teichmann@intevation.de>
date Fri, 23 Aug 2019 18:02:01 +0200
parents d8b736ba3f32
children 671441357db0
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package imports
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15
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16 import (
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17 "context"
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18 "database/sql"
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19 "time"
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20
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21 "gemma.intevation.de/gemma/pkg/common"
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22 "gemma.intevation.de/gemma/pkg/octree"
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23 )
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24
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25 type IsoRefresh struct {
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26 ClassBreaks string `json:"class-breaks"`
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27 }
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28
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29 // ISRJobKind is the unique name of this import job type.
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30 const ISRJobKind JobKind = "isr"
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31
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32 func init() { RegisterJobCreator(ISRJobKind, isrJobCreator{}) }
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33
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34 type isrJobCreator struct{}
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35
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36 func (isrJobCreator) Description() string { return "refresh iso lines" }
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37
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38 func (isrJobCreator) AutoAccept() bool { return true }
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39
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40 func (isrJobCreator) Create() Job { return new(IsoRefresh) }
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41
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42 func (isrJobCreator) StageDone(context.Context, *sql.Tx, int64) error {
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43 return nil
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44 }
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45
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46 func (isrJobCreator) Depends() [2][]string {
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47 return [2][]string{
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48 {"sounding_results", "sounding_results_contour_lines"},
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49 {},
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50 }
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51 }
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52
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53 const (
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54 fetchSoundingResultsIDsSQL = `
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55 SELECT bottleneck_id, id
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56 FROM waterway.sounding_results
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57 ORDER BY bottleneck_id
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58 `
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59 deleteContourLinesSQL = `
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60 DELETE FROM waterway.sounding_results_contour_lines
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61 WHERE sounding_result_id = $1
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62 `
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63 )
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64
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65 func (isr *IsoRefresh) CleanUp() error { return nil }
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66
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67 type bottleneckSoundingResults struct {
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68 bn string
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69 srs []int64
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70 }
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71
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72 func fetchBottleneckResults(
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73 ctx context.Context,
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74 conn *sql.Conn,
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75 ) ([]bottleneckSoundingResults, error) {
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76
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77 rows, err := conn.QueryContext(ctx, fetchSoundingResultsIDsSQL)
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78 if err != nil {
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79 return nil, err
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80 }
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81 defer rows.Close()
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82
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83 var ids []bottleneckSoundingResults
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84
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85 for rows.Next() {
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86 var bn string
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87 var sr int64
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88 if err := rows.Scan(&bn, &sr); err != nil {
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89 return nil, err
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90 }
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91 if len(ids) > 0 {
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92 if ids[len(ids)-1].bn != bn {
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93 ids = append(ids, bottleneckSoundingResults{
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94 bn: bn,
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95 srs: []int64{sr},
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96 })
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97 } else {
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98 ids[len(ids)-1].srs = append(ids[len(ids)-1].srs, sr)
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99 }
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100 } else {
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101 ids = []bottleneckSoundingResults{
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102 {bn: bn, srs: []int64{sr}},
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103 }
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104 }
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105 }
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106 if err := rows.Err(); err != nil {
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107 return nil, err
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108 }
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109 return ids, nil
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110 }
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111
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112 // Do executes the actual refreshing of the iso lines.
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113 func (isr *IsoRefresh) Do(
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114 ctx context.Context,
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115 importID int64,
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116 conn *sql.Conn,
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117 feedback Feedback,
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118 ) (interface{}, error) {
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119
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120 start := time.Now()
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121 defer func() {
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122 feedback.Info(
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123 "Processing all sounding results took %v.",
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124 time.Since(start))
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125 }()
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126
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127 heights, err := octree.ParseClassBreaks(isr.ClassBreaks)
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128 if err != nil {
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129 return nil, err
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130 }
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131
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132 bns, err := fetchBottleneckResults(ctx, conn)
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133 if err != nil {
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134 return nil, err
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135 }
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136
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137 for i := range bns {
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138 start := time.Now()
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139 feedback.Info("Processing bottleneck '%s' ...", bns[i].bn)
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140 err := isr.processBottleneck(
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141 ctx, conn,
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142 heights,
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143 &bns[i],
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144 )
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145 feedback.Info("Processing took %v.", time.Since(start))
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146 if err != nil {
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147 return nil, err
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148 }
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149 }
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150
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151 return nil, nil
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152 }
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153
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154 func (isr *IsoRefresh) processBottleneck(
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155 ctx context.Context,
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156 conn *sql.Conn,
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157 heights []float64,
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158 bn *bottleneckSoundingResults,
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159 ) error {
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160 // Do one transaction per bottleneck.
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161 tx, err := conn.BeginTx(ctx, nil)
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162 if err != nil {
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163 return nil
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164 }
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165 defer tx.Rollback()
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166
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167 insertStmt, err := tx.Prepare(insertContourSQL)
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168 if err != nil {
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169 return err
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170 }
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171
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172 // For all sounding results in bottleneck.
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173 for _, sr := range bn.srs {
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174 tree, err := octree.FetchOctreeDirectly(ctx, tx, sr)
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175 if err != nil {
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176 return err
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177 }
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178 hs := octree.ExtrapolateClassBreaks(heights, tree.Min.Z, tree.Max.Z)
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179 hs = common.DedupFloat64s(hs)
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180
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181 // Delete the old contour lines.
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182 if _, err := tx.ExecContext(ctx, deleteContourLinesSQL, sr); err != nil {
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183 return err
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184 }
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185
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186 octree.DoContours(tree, hs, func(res *octree.ContourResult) {
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187 if err == nil && len(res.Lines) > 0 {
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188 _, err = insertStmt.ExecContext(
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189 ctx,
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190 sr, res.Height, tree.EPSG,
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191 res.Lines.AsWKB2D(),
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192 contourTolerance)
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193 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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194 })
49564382ffff Added a import queue job to recalculate the contour lines of the sounding results if the heights have changed.
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parents:
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195 if err != nil {
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196 return err
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197 }
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198 }
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199
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d8b736ba3f32 Refresh iso contour lines import: Commit the changes!
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200 return tx.Commit()
4214
49564382ffff Added a import queue job to recalculate the contour lines of the sounding results if the heights have changed.
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201 }