Mercurial > gemma
annotate client/src/application/lib/geo.js @ 964:1e2dce348cfb
Serialize boundary polygon of sounding result as WKB.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 17 Oct 2018 15:29:58 +0200 |
parents | dedf252b3e01 |
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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 }; |