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annotate client/src/application/lib/geo.js @ 1020:e89be4af3a9f

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restructure surveyrequest
author Thomas Junk <thomas.junk@intevation.de>
date Wed, 24 Oct 2018 10:56:41 +0200
parents ca628dce90dd
children dd67e46366ef
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1 /*
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2 * This is Free Software under GNU Affero General Public License v >= 3.0
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3 * without warranty, see README.md and license for details.
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4 *
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5 * SPDX-License-Identifier: AGPL-3.0-or-later
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6 * License-Filename: LICENSES/AGPL-3.0.txt
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7 *
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Thomas Junk <thomas.junk@intevation.de>
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8 * Copyright (C) 2018 by via donau
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Thomas Junk <thomas.junk@intevation.de>
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9 * – Österreichische Wasserstraßen-Gesellschaft mbH
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10 * Software engineering by Intevation GmbH
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11 *
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12 * Author(s):
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13 * Thomas Junk <thomas.junk@intevation.de>
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14 */
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15
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16 /**
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17 *
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18 * Distance calculations
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19 * JS transposition of cross.go functions
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20 *
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21 */
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22
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23 import { GeoJSON } from "ol/format.js";
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24 import Feature from "ol/Feature";
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25
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26 const EARTHRADIUS = 6378137.0;
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27
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28 /**
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29 * Converts to radiant
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30 * @param {degree} d
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31 */
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32 const deg2rad = d => {
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33 return (d * Math.PI) / 180.0;
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34 };
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35
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36 /**
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37 * Calculates the difference between two points in m
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38 *
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39 * Points are given with {lat: $lat, lon: $lon}
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40 *
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41 * @param {object} P1
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42 * @param {object} P2
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43 */
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44 const distanceBetween = (P1, P2) => {
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45 const dLat = deg2rad(P2.lat - P1.lat);
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46 let dLng = Math.abs(deg2rad(P2.lon - P1.lon));
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47 if (dLng > Math.PI) {
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48 dLng = 2 * Math.PI - dLng;
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49 }
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50 const x = dLng * Math.cos(deg2rad((P1.lat + P2.lat) / 2.0));
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51 return Math.sqrt(dLat * dLat + x * x) * EARTHRADIUS;
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52 };
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53
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54 /**
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55 * Takes a triple of [lat, long, alt] and generates
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56 * an object with according attributes
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57 * {
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58 * lat: $lat,
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59 * lon: $lon,
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60 * alt: $alt
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61 * }
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62 *
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63 * @param {array} coords
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64 */
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65 const Point = coords => {
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66 return {
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67 lon: coords[0],
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68 lat: coords[1],
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69 alt: coords[2]
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70 };
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71 };
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72
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73 /**
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74 * Has geoJSON as its input and transforms
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75 * given coordinates into points representing
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76 * distance from startpoint / altitude information
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77 *
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78 * a) extracting the minimum altitude
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79 * b) extracting the maximum altitude
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80 * c) calculating the total length of the given profile
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81 * d) transposes the datapoints relative to a given start point
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82 *
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83 * The calculation of total equals the sum of partial distances between points
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84 *
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85 * The x-value of a point is equal to the total distance up to this point
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86 *
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87 * The distance between the last point of the last segment and the end point is added
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88 * to the total
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89 *
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90 * @param {object} geoJSON, startPoint, endPoint
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91 */
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92 const transform = ({ geoJSON, startPoint, endPoint }) => {
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93 const lineSegments = geoJSON.geometry.coordinates;
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94 let segmentPoints = [];
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95 let lengthPolyLine = 0;
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96 let referencePoint = Point(startPoint);
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97 let minAlt = Math.abs(lineSegments[0][0][2]);
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98 let maxAlt = Math.abs(lineSegments[0][0][2]);
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99 let currentPoint = null;
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100 for (let segment of lineSegments) {
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101 let points = [];
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102 for (let coordinateTriplet of segment) {
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103 currentPoint = Point(coordinateTriplet);
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104 lengthPolyLine += distanceBetween(referencePoint, currentPoint);
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105 let y = Math.abs(currentPoint.alt);
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106 points.push({
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107 x: lengthPolyLine,
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108 y: y
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109 });
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110 if (y < minAlt) minAlt = y;
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111 if (y > maxAlt) maxAlt = y;
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112 referencePoint = currentPoint;
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113 }
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114 segmentPoints.push(points);
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115 }
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116 lengthPolyLine += distanceBetween(currentPoint, Point(endPoint));
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117 return { segmentPoints, lengthPolyLine, minAlt, maxAlt };
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118 };
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119
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120 /**
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121 * Prepare profile takes geoJSON data in form of
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122 * a MultiLineString, e.g.
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123 *
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124 * {
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125 * type: "Feature",
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126 * geometry: {
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127 * type: "MultiLineString",
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128 * coordinates: [
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129 * [
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130 * [16.53593398, 48.14694085, -146.52392755]
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131 * ...
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132 * ]]
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133 *
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134 * and transforms it to a structure representing the number of sections
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135 * where data is present with according lengths and the points
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136 *
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137 * {
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138 * { points:
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139 * [
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140 * [ { x: 0.005798201616417183, y: -146.52419461 },
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141 * { x: 0, y: -146.52394016 }
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142 * ...
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143 * ]
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144 * ]
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145 * lengthPolyLine: 160.06814078495722,
666
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146 * minAlt: -146.73122231,
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147 * maxAlt: -145.65155866
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148 * }
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149 *
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150 * @param {object} geoJSON
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151 */
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152 const prepareProfile = ({ geoJSON, startPoint, endPoint }) => {
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153 const { segmentPoints, lengthPolyLine, minAlt, maxAlt } = transform({
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154 geoJSON,
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155 startPoint,
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156 endPoint
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157 });
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158 return {
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159 points: segmentPoints,
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160 lengthPolyLine: lengthPolyLine,
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161 minAlt: minAlt,
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162 maxAlt: maxAlt
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163 };
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164 };
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165
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166 const generateFeatureRequest = (profileLine, survey) => {
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167 const feature = new Feature({
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168 geometry: profileLine,
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169 bottleneck: survey.bottleneck_id,
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170 date: survey.date_info
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171 });
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172 return new GeoJSON({ geometryName: "geometry" }).writeFeature(feature);
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173 };
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174
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175 export { generateFeatureRequest, prepareProfile };