Mercurial > gemma

annotate pkg/controllers/cross.go @ 1224:bc4b642c8d04

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Started with an upload sounding result to temp upload area.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 19 Nov 2018 17:14:42 +0100
parents 936dd3714325
children d753ce6cf588
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 "log"
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21 "net/http"
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22 "time"
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23
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24 "gemma.intevation.de/gemma/pkg/models"
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25 "gemma.intevation.de/gemma/pkg/octree"
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26 )
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27
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28 const WGS84 = 4326
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29
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30 func reproject(
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31 rp *models.Reprojector,
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32 src models.GeoJSONLineCoordinates,
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33 ctx context.Context,
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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 s.Lat, s.Lon, ctx,
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41 ); err != nil {
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42 return nil, err
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43 }
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44 }
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45 return dst, nil
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46 }
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47
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48 const projectBackSQL = `
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49 SELECT ST_AsBinary(
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50 ST_Transform(ST_GeomFromWKB($2, $1::integer), 4326))`
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51
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52 func projectBack(
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53 line octree.MultiLineStringZ,
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54 epsg uint32,
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55 conn *sql.Conn,
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56 ctx context.Context,
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57 ) (models.GeoJSONMultiLineCoordinatesZ, error) {
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58
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59 var mls models.GeoJSONMultiLineCoordinatesZ
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60 err := conn.QueryRowContext(
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61 ctx, projectBackSQL,
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62 epsg, line.AsWKB(),
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63 ).Scan(&mls)
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64
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65 return mls, err
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66 }
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67
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68 func crossSection(
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69 input interface{},
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70 req *http.Request,
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71 conn *sql.Conn,
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72 ) (jr JSONResult, err error) {
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73
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74 csi := input.(*models.CrossSectionInput)
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75
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76 start := time.Now()
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77
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78 tree, err := octree.Cache.Get(
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79 csi.Properties.Bottleneck, csi.Properties.Date.Time,
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80 conn, req.Context())
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81
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82 log.Printf("loading octree took: %s\n", time.Since(start))
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83 if err != nil {
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84 return
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85 }
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86
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87 if tree == nil {
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88 err = JSONError{
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89 Code: http.StatusNotFound,
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90 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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91 csi.Properties.Bottleneck,
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92 csi.Properties.Date.Time),
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93 }
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94 return
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95 }
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96
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97 // The coordinate system of the octree is an UTM projection.
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98 // The input coordinates are in WGS84.
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99 // So we need to reproject them.
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100
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101 start = time.Now()
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102
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103 var rp *models.Reprojector
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104 if rp, err = models.NewReprojector(
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105 conn, req.Context(),
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106 WGS84, tree.EPSG,
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107 ); err != nil {
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108 return
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109 }
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110 defer rp.Close()
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111
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112 coords, err := reproject(rp, csi.Geometry.Coordinates, req.Context())
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113
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114 log.Printf("transforming input coords took: %s\n", time.Since(start))
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115 if err != nil {
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116 return
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117 }
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118
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119 start = time.Now()
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120
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121 var segments octree.MultiLineStringZ
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122
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123 for i := 0; i < len(coords)-1; i++ {
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124 c1 := &coords[i]
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125 c2 := &coords[i+1]
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126
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127 verticalLine := octree.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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128
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129 var line octree.MultiLineStringZ
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130 tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *octree.Triangle) {
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131 if ls := verticalLine.Intersection(t); len(ls) > 0 {
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132 line = append(line, ls)
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133 }
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134 })
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135
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136 if len(line) > 0 {
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137 log.Printf("line length: %d\n", len(line))
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138 // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon).
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139 // Sort them by project them on this line.
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140 joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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141 log.Printf("joined length: %d\n", len(joined))
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142 segments = append(segments, joined...)
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143 }
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144
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145 }
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146 log.Printf("octree traversal took: %s\n", time.Since(start))
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147
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148 start = time.Now()
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149
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150 var joined models.GeoJSONMultiLineCoordinatesZ
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151 joined, err = projectBack(
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152 segments, tree.EPSG,
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153 conn, req.Context(),
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154 )
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155
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156 log.Printf("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 = 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 Properties: map[string]interface{}{},
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169 },
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170 }
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171
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172 return
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173 }