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annotate client/src/lib/geo.js @ 2264:627bfcbbf631

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client: Draw fairway dimensions for all LoS and in more "cut cases".
author Raimund Renkert <raimund.renkert@intevation.de>
date Thu, 14 Feb 2019 13:53:54 +0100
parents ca33ad696594
children 940ae7c20326
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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 * Thomas Junk <thomas.junk@intevation.de>
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13 */
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14
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15 /**
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16 *
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17 * Distance calculations
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18 * JS transposition of cross.go functions
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19 *
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20 */
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21
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22 import { GeoJSON } from "ol/format.js";
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23 import Feature from "ol/Feature";
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24 import distance from "@turf/distance";
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25 import {
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26 lineString as turfLineString,
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27 polygon as turfPolygon
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28 } from "@turf/helpers";
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29 import lineSplit from "@turf/line-split";
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30 import lineSlice from "@turf/line-slice";
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31 import lineIntersect from "@turf/line-intersect";
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32 import booleanWithin from "@turf/boolean-within";
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33 import booleanContains from "@turf/boolean-contains";
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34
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35 const EARTHRADIUS = 6378137.0;
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36
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37 /**
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38 * Converts to radiant
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39 * @param {degree} d
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40 */
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41 const deg2rad = d => {
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42 return (d * Math.PI) / 180.0;
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43 };
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44
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45 /**
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46 * Calculates the difference between two points in m
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47 *
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48 * Points are given with {lat: $lat, lon: $lon}
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49 *
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50 * @param {object} P1
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51 * @param {object} P2
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52 */
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53 const distanceBetween = (P1, P2) => {
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54 const dLat = deg2rad(P2.lat - P1.lat);
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55 let dLng = Math.abs(deg2rad(P2.lon - P1.lon));
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56 if (dLng > Math.PI) {
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57 dLng = 2 * Math.PI - dLng;
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58 }
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59 const x = dLng * Math.cos(deg2rad((P1.lat + P2.lat) / 2.0));
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60 return Math.sqrt(dLat * dLat + x * x) * EARTHRADIUS;
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61 };
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62
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63 /**
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64 * Takes a triple of [lat, long, alt] and generates
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65 * an object with according attributes
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66 * {
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67 * lat: $lat,
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68 * lon: $lon,
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69 * alt: $alt
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70 * }
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71 *
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72 * @param {array} coords
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73 */
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74 const Point = coords => {
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75 return {
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76 lon: coords[0],
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77 lat: coords[1],
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78 alt: coords[2]
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79 };
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80 };
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81
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82 /**
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83 * Has geoJSON as its input and transforms
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84 * given coordinates into points representing
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85 * distance from startpoint / altitude information
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86 *
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87 * a) extracting the minimum altitude
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88 * b) extracting the maximum altitude
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89 * c) calculating the total length of the given profile
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90 * d) transposes the datapoints relative to a given start point
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91 *
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92 * The calculation of total equals the sum of partial distances between points
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93 *
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94 * The x-value of a point is equal to the total distance up to this point
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95 *
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96 * The distance between the last point of the last segment and the end point is added
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97 * to the total
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98 *
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99 * @param {object} geoJSON, startPoint, endPoint
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100 */
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101 const transform = ({ geoJSON, startPoint, endPoint }) => {
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102 const lineSegments = geoJSON.geometry.coordinates;
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103 let segmentPoints = [];
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104 let lengthPolyLine = 0;
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105 let referencePoint = Point(startPoint);
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106 let minAlt = Math.abs(lineSegments[0][0][2]);
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107 let maxAlt = Math.abs(lineSegments[0][0][2]);
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108 let currentPoint = null;
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109 for (let segment of lineSegments) {
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110 let points = [];
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111 for (let coordinateTriplet of segment) {
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112 currentPoint = Point(coordinateTriplet);
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113 lengthPolyLine += distanceBetween(referencePoint, currentPoint);
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114 let y = Math.abs(currentPoint.alt);
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115 points.push({
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116 x: lengthPolyLine,
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117 y: y
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118 });
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119 if (y < minAlt) minAlt = y;
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120 if (y > maxAlt) maxAlt = y;
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121 referencePoint = currentPoint;
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122 }
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123 segmentPoints.push(points);
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124 }
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125 lengthPolyLine += distanceBetween(currentPoint, Point(endPoint));
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126 return { segmentPoints, lengthPolyLine, minAlt, maxAlt };
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127 };
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128
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129 /**
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130 * Prepare profile takes geoJSON data in form of
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131 * a MultiLineString, e.g.
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132 *
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133 * {
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134 * type: "Feature",
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135 * geometry: {
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136 * type: "MultiLineString",
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137 * coordinates: [
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138 * [
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139 * [16.53593398, 48.14694085, -146.52392755]
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140 * ...
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141 * ]]
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142 *
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143 * and transforms it to a structure representing the number of sections
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144 * where data is present with according lengths and the points
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145 *
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146 * {
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147 * { points:
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148 * [
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149 * [ { x: 0.005798201616417183, y: -146.52419461 },
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150 * { x: 0, y: -146.52394016 }
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151 * ...
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152 * ]
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153 * ]
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154 * lengthPolyLine: 160.06814078495722,
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155 * minAlt: -146.73122231,
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156 * maxAlt: -145.65155866
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157 * }
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158 *
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159 * @param {object} geoJSON
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160 */
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161 const prepareProfile = ({ geoJSON, startPoint, endPoint }) => {
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162 const { segmentPoints, lengthPolyLine, minAlt, maxAlt } = transform({
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163 geoJSON,
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164 startPoint,
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165 endPoint
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166 });
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167 return {
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168 points: segmentPoints,
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169 lengthPolyLine: lengthPolyLine,
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170 minAlt: minAlt,
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171 maxAlt: maxAlt
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172 };
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173 };
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174
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175 const generateFeatureRequest = (profileLine, bottleneck_id, date_info) => {
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176 const feature = new Feature({
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177 geometry: profileLine,
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178 bottleneck: bottleneck_id,
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179 date: date_info
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180 });
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181 return new GeoJSON({ geometryName: "geometry" }).writeFeature(feature);
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182 };
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183
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184 const calculateFairwayCoordinates = (profileLine, fairwayGeometry, depth) => {
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185 // both geometries have to be in EPSG:4326
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186 // uses turfjs distance() function
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187 let fairwayCoordinates = [];
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188 var line = turfLineString(profileLine.getCoordinates());
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189 var polygon = turfPolygon(fairwayGeometry.getCoordinates());
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190 var intersects = lineIntersect(line, polygon);
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191
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192 var startPoint, endPoint
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193
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194 if (intersects.features.length == 2) {
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195 let line1 = lineSlice(intersects.features[0].geometry, intersects.features[1].geometry, line);
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196 startPoint = line1.geometry.coordinates[0];
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197 endPoint = line1.geometry.coordinates[1];
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198 } else if (booleanWithin(line, polygon)) {
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199 startPoint = line.geometry.coordinates[0];
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200 endPoint = line.geometry.coordinates[1];
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201 } else {
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202 let split = lineSplit(line, polygon);
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203 for (let feature of split.features) {
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204 if (booleanWithin(feature, polygon)){
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205 startPoint = feature.geometry.coordinates[0];
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206 endPoint = feature.geometry.coordinates[1];
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207 }
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208 if (booleanContains(polygon, feature)){
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209 startPoint = feature.geometry.coordinates[0];
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210 endPoint = feature.geometry.coordinates[1];
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211 }
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212 }
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213 }
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214
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215 let opts = { units: "kilometers" };
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216 let pStartPoint = profileLine.getCoordinates()[0];
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217 fairwayCoordinates.push([
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218 distance(pStartPoint, startPoint, opts) * 1000,
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219 distance(pStartPoint, endPoint, opts) * 1000,
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220 depth
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221 ]);
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222
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223 return fairwayCoordinates;
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224 };
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225
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226 const featureToFairwayCoordinates = (feature, profileLine) => {
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227 // need to use EPSG:3857 which is the proj of vectorSource
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228 var intersectingPolygon = feature
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229 .getGeometry()
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230 .clone()
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231 .transform("EPSG:3857", "EPSG:4326");
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232 const fairwayCoordinates = calculateFairwayCoordinates(
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233 profileLine,
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234 intersectingPolygon,
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235 feature.get("min_depth") ? feature.get("min_depth") / 100 : 2.5
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236 );
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237 return fairwayCoordinates;
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238 };
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239
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240 export {
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241 generateFeatureRequest,
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242 prepareProfile,
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243 calculateFairwayCoordinates,
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244 featureToFairwayCoordinates
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245 };