Mercurial > gemma

annotate pkg/controllers/cross.go @ 5591:0011f50cf216 surveysperbottleneckid

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Removed no longer used alternative api for surveys/ endpoint. As bottlenecks in the summary for SR imports are now identified by their id and no longer by the (not guarantied to be unique!) name, there is no longer the need to request survey data by the name+date tuple (which isn't reliable anyway). So the workaround was now reversed.
author Sascha Wilde <wilde@sha-bang.de>
date Wed, 06 Apr 2022 13:30:29 +0200
parents 5f47eeea988d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 controllers
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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 "fmt"
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20 "net/http"
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21 "time"
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22
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23 "gemma.intevation.de/gemma/pkg/log"
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24 "gemma.intevation.de/gemma/pkg/mesh"
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25 "gemma.intevation.de/gemma/pkg/models"
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26
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27 mw "gemma.intevation.de/gemma/pkg/middleware"
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28 )
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29
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30 func reproject(
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31 ctx context.Context,
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32 rp *models.Reprojector,
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33 src models.GeoJSONLineCoordinates,
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34 ) (models.GeoJSONLineCoordinates, error) {
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35
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36 dst := make(models.GeoJSONLineCoordinates, len(src))
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37 for i, s := range src {
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38 var err error
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39 if dst[i].Lat, dst[i].Lon, err = rp.Reproject(
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40 ctx,
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41 s.Lat, s.Lon,
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42 ); err != nil {
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43 return nil, err
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44 }
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45 }
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46 return dst, nil
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47 }
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48
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49 const projectBackSQL = `
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50 SELECT ST_AsBinary(
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51 ST_Transform(ST_GeomFromWKB($2, $1::integer), 4326))`
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52
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53 func projectBack(
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54 ctx context.Context,
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55 line mesh.MultiLineStringZ,
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56 epsg uint32,
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57 conn *sql.Conn,
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58 ) (models.GeoJSONMultiLineCoordinatesZ, error) {
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59
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60 var mls models.GeoJSONMultiLineCoordinatesZ
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61 err := conn.QueryRowContext(
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62 ctx, projectBackSQL,
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63 epsg, line.AsWKB(),
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64 ).Scan(&mls)
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65
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66 return mls, err
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67 }
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68
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69 func crossSection(req *http.Request) (jr mw.JSONResult, err error) {
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70
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71 csi := mw.JSONInput(req).(*models.CrossSectionInput)
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72
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73 start := time.Now()
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74 ctx := req.Context()
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75 conn := mw.JSONConn(req)
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76
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77 tree, err := mesh.FromCache(
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78 ctx, conn,
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79 csi.Properties.Bottleneck, csi.Properties.Date.Time)
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80
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81 log.Infof("loading mesh took %s\n", time.Since(start))
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82 if err != nil {
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83 return
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84 }
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85
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86 if tree == nil {
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87 err = mw.JSONError{
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88 Code: http.StatusNotFound,
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89 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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90 csi.Properties.Bottleneck,
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91 csi.Properties.Date.Time),
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92 }
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93 return
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94 }
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95
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96 // The coordinate system of the mesh is an UTM projection.
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97 // The input coordinates are in WGS84.
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98 // So we need to reproject them.
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99
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100 start = time.Now()
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101
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102 var rp *models.Reprojector
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103 if rp, err = models.NewReprojector(
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104 ctx, conn,
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105 models.WGS84, tree.EPSG(),
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106 ); err != nil {
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107 return
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108 }
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109 defer rp.Close()
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110
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111 coords, err := reproject(ctx, rp, csi.Geometry.Coordinates)
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112
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113 log.Infof("transforming input coords took %s\n", time.Since(start))
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114 if err != nil {
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115 return
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116 }
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117
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118 start = time.Now()
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119
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120 var segments mesh.MultiLineStringZ
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121
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122 for i := 0; i < len(coords)-1; i++ {
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123 c1 := &coords[i]
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124 c2 := &coords[i+1]
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125
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126 verticalLine := mesh.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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127
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128 var line mesh.MultiLineStringZ
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129 tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *mesh.Triangle) {
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130 if ls := verticalLine.Intersection(t); len(ls) > 0 {
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131 line = append(line, ls)
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132 }
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133 })
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134
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135 if len(line) > 0 {
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136 log.Infof("line length: %d\n", len(line))
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137 // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon).
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138 // Sort them by project them on this line.
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139 joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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140 log.Infof("joined length: %d\n", len(joined))
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141 segments = append(segments, joined...)
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142 }
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143
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144 }
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145 log.Infof("mesh traversal took %s\n", time.Since(start))
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146
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147 start = time.Now()
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148
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149 var joined models.GeoJSONMultiLineCoordinatesZ
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150 joined, err = projectBack(
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151 ctx,
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152 segments, tree.EPSG(),
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153 conn,
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154 )
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155
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156 log.Infof("projecting back took %s\n", time.Since(start))
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157 if err != nil {
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158 return
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159 }
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160
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161 jr = mw.JSONResult{
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162 Result: &models.CrossSectionOutput{
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163 Type: "Feature",
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164 Geometry: models.CrossSectionOutputGeometry{
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165 Type: "MultiLineString",
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166 Coordinates: joined,
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167 },
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168 },
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169 }
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170
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171 return
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172 }