Mercurial > gemma

annotate client/src/application/lib/geo.js @ 781:f6a6ce90a1b5

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client: improve search * Make result entries clickable and catch the event. * Sort methods: in code.
author Bernhard Reiter <bernhard@intevation.de>
date Wed, 26 Sep 2018 14:35:55 +0200
parents dedf252b3e01
children ca628dce90dd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
666
4c36b0e39d78 feat: prepareProfile converts geoJSON to diagram data.
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1 /**
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2 *
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3 * Distance calculations
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4 * JS transposition of cross.go functions
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5 *
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6 */
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7
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8 const EARTHRADIUS = 6378137.0;
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9
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10 /**
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11 * Converts to radiant
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12 * @param {degree} d
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13 */
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14 const deg2rad = d => {
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15 return (d * Math.PI) / 180.0;
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16 };
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17
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18 /**
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19 * Calculates the difference between two points in m
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20 *
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21 * Points are given with {lat: $lat, lon: $lon}
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22 *
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23 * @param {object} P1
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24 * @param {object} P2
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25 */
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26 const distanceBetween = (P1, P2) => {
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27 const dLat = deg2rad(P2.lat - P1.lat);
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28 let dLng = Math.abs(deg2rad(P2.lon - P1.lon));
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29 if (dLng > Math.PI) {
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30 dLng = 2 * Math.PI - dLng;
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31 }
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32 const x = dLng * Math.cos(deg2rad((P1.lat + P2.lat) / 2.0));
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33 return Math.sqrt(dLat * dLat + x * x) * EARTHRADIUS;
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34 };
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35
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36 /**
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37 * Takes a triple of [lat, long, alt] and generates
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38 * an object with according attributes
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39 * {
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40 * lat: $lat,
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41 * lon: $lon,
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42 * alt: $alt
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43 * }
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44 *
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45 * @param {array} coords
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46 */
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47 const Point = coords => {
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48 return {
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49 lon: coords[0],
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50 lat: coords[1],
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51 alt: coords[2]
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52 };
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53 };
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54
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55 /**
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56 * Has geoJSON as its input and transforms
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57 * given coordinates into points representing
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58 * distance from startpoint / altitude information
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59 *
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60 * a) extracting the minimum altitude
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61 * b) extracting the maximum altitude
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62 * c) calculating the total length of the given profile
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63 * d) transposes the datapoints relative to a given start point
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64 *
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65 * The calculation of total equals the sum of partial distances between points
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66 *
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67 * The x-value of a point is equal to the total distance up to this point
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68 *
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69 * The distance between the last point of the last segment and the end point is added
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70 * to the total
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71 *
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72 * @param {object} geoJSON, startPoint, endPoint
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73 */
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74 const transform = ({ geoJSON, startPoint, endPoint }) => {
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75 const lineSegments = geoJSON.geometry.coordinates;
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76 let segmentPoints = [];
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77 let lengthPolyLine = 0;
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78 let referencePoint = Point(startPoint);
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79 let minAlt = Math.abs(lineSegments[0][0][2]);
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80 let maxAlt = Math.abs(lineSegments[0][0][2]);
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81 let currentPoint = null;
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82 for (let segment of lineSegments) {
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83 let points = [];
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84 for (let coordinateTriplet of segment) {
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85 currentPoint = Point(coordinateTriplet);
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86 lengthPolyLine += distanceBetween(referencePoint, currentPoint);
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87 let y = Math.abs(currentPoint.alt);
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88 points.push({
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89 x: lengthPolyLine,
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90 y: y
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91 });
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92 if (y < minAlt) minAlt = y;
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93 if (y > maxAlt) maxAlt = y;
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94 referencePoint = currentPoint;
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95 }
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96 segmentPoints.push(points);
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97 }
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98 lengthPolyLine += distanceBetween(currentPoint, Point(endPoint));
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99 return { segmentPoints, lengthPolyLine, minAlt, maxAlt };
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100 };
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101
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102 /**
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103 * Prepare profile takes geoJSON data in form of
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104 * a MultiLineString, e.g.
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105 *
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106 * {
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107 * type: "Feature",
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108 * geometry: {
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109 * type: "MultiLineString",
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110 * coordinates: [
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111 * [
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112 * [16.53593398, 48.14694085, -146.52392755]
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113 * ...
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114 * ]]
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115 *
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116 * and transforms it to a structure representing the number of sections
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117 * where data is present with according lengths and the points
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118 *
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119 * {
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120 * { points:
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121 * [
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122 * [ { x: 0.005798201616417183, y: -146.52419461 },
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123 * { x: 0, y: -146.52394016 }
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124 * ...
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125 * ]
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126 * ]
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127 * lengthPolyLine: 160.06814078495722,
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128 * minAlt: -146.73122231,
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129 * maxAlt: -145.65155866
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130 * }
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131 *
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132 * @param {object} geoJSON
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133 */
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134 const prepareProfile = ({ geoJSON, startPoint, endPoint }) => {
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135 const { segmentPoints, lengthPolyLine, minAlt, maxAlt } = transform({
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136 geoJSON,
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137 startPoint,
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138 endPoint
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139 });
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140 return {
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141 points: segmentPoints,
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142 lengthPolyLine: lengthPolyLine,
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143 minAlt: minAlt,
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144 maxAlt: maxAlt
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145 };
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146 };
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147
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148 export { prepareProfile };