456 lines
46 KiB
JavaScript
456 lines
46 KiB
JavaScript
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(function () {
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/* Imports */
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var Meteor = Package.meteor.Meteor;
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/* Package-scope variables */
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var GeoJSON, module;
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(function () {
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// //
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// packages/geojson-utils/pre.js //
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// //
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Define an object named exports. This will cause geojson-utils.js to put `gju` // 1
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// as a field on it, instead of in the global namespace. See also post.js. // 2
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module = {exports:{}}; // 3
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// 4
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// 5
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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}).call(this);
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(function () {
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// //
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// packages/geojson-utils/geojson-utils.js //
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// //
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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(function () { // 1
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var gju = {}; // 2
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// 3
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// Export the geojson object for **CommonJS** // 4
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if (typeof module !== 'undefined' && module.exports) { // 5
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module.exports = gju; // 6
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} // 7
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// 8
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// adapted from http://www.kevlindev.com/gui/math/intersection/Intersection.js // 9
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gju.lineStringsIntersect = function (l1, l2) { // 10
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var intersects = []; // 11
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for (var i = 0; i <= l1.coordinates.length - 2; ++i) { // 12
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for (var j = 0; j <= l2.coordinates.length - 2; ++j) { // 13
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var a1 = { // 14
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x: l1.coordinates[i][1], // 15
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y: l1.coordinates[i][0] // 16
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}, // 17
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a2 = { // 18
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x: l1.coordinates[i + 1][1], // 19
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y: l1.coordinates[i + 1][0] // 20
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}, // 21
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b1 = { // 22
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x: l2.coordinates[j][1], // 23
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y: l2.coordinates[j][0] // 24
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}, // 25
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b2 = { // 26
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x: l2.coordinates[j + 1][1], // 27
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y: l2.coordinates[j + 1][0] // 28
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}, // 29
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ua_t = (b2.x - b1.x) * (a1.y - b1.y) - (b2.y - b1.y) * (a1.x - b1.x), // 30
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ub_t = (a2.x - a1.x) * (a1.y - b1.y) - (a2.y - a1.y) * (a1.x - b1.x), // 31
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u_b = (b2.y - b1.y) * (a2.x - a1.x) - (b2.x - b1.x) * (a2.y - a1.y); // 32
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if (u_b != 0) { // 33
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var ua = ua_t / u_b, // 34
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ub = ub_t / u_b; // 35
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if (0 <= ua && ua <= 1 && 0 <= ub && ub <= 1) { // 36
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intersects.push({ // 37
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'type': 'Point', // 38
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'coordinates': [a1.x + ua * (a2.x - a1.x), a1.y + ua * (a2.y - a1.y)] // 39
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}); // 40
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} // 41
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} // 42
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} // 43
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} // 44
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if (intersects.length == 0) intersects = false; // 45
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return intersects; // 46
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} // 47
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// 48
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// Bounding Box // 49
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// 50
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function boundingBoxAroundPolyCoords (coords) { // 51
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var xAll = [], yAll = [] // 52
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// 53
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for (var i = 0; i < coords[0].length; i++) { // 54
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xAll.push(coords[0][i][1]) // 55
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yAll.push(coords[0][i][0]) // 56
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} // 57
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// 58
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xAll = xAll.sort(function (a,b) { return a - b }) // 59
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yAll = yAll.sort(function (a,b) { return a - b }) // 60
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// 61
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return [ [xAll[0], yAll[0]], [xAll[xAll.length - 1], yAll[yAll.length - 1]] ] // 62
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} // 63
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// 64
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gju.pointInBoundingBox = function (point, bounds) { // 65
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return !(point.coordinates[1] < bounds[0][0] || point.coordinates[1] > bounds[1][0] || point.coordinates[0] < bounds[0][1] || point.coordinates[0] > bounds[1][1])
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} // 67
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// 68
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// Point in Polygon // 69
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// http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html#Listing the Vertices // 70
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// 71
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function pnpoly (x,y,coords) { // 72
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var vert = [ [0,0] ] // 73
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// 74
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for (var i = 0; i < coords.length; i++) { // 75
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for (var j = 0; j < coords[i].length; j++) { // 76
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vert.push(coords[i][j]) // 77
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} // 78
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vert.push([0,0]) // 79
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} // 80
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// 81
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var inside = false // 82
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for (var i = 0, j = vert.length - 1; i < vert.length; j = i++) { // 83
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if (((vert[i][0] > y) != (vert[j][0] > y)) && (x < (vert[j][1] - vert[i][1]) * (y - vert[i][0]) / (vert[j][0] - vert[i][0]) + vert[i][1])) inside = !inside
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} // 85
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// 86
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return inside // 87
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} // 88
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// 89
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gju.pointInPolygon = function (p, poly) { // 90
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var coords = (poly.type == "Polygon") ? [ poly.coordinates ] : poly.coordinates // 91
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// 92
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var insideBox = false // 93
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for (var i = 0; i < coords.length; i++) { // 94
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if (gju.pointInBoundingBox(p, boundingBoxAroundPolyCoords(coords[i]))) insideBox = true // 95
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} // 96
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if (!insideBox) return false // 97
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// 98
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var insidePoly = false // 99
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for (var i = 0; i < coords.length; i++) { // 100
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if (pnpoly(p.coordinates[1], p.coordinates[0], coords[i])) insidePoly = true // 101
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} // 102
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// 103
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return insidePoly // 104
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} // 105
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// 106
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gju.numberToRadius = function (number) { // 107
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return number * Math.PI / 180; // 108
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} // 109
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// 110
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gju.numberToDegree = function (number) { // 111
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return number * 180 / Math.PI; // 112
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} // 113
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// 114
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// written with help from @tautologe // 115
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gju.drawCircle = function (radiusInMeters, centerPoint, steps) { // 116
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var center = [centerPoint.coordinates[1], centerPoint.coordinates[0]], // 117
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dist = (radiusInMeters / 1000) / 6371, // 118
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// convert meters to radiant // 119
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radCenter = [gju.numberToRadius(center[0]), gju.numberToRadius(center[1])], // 120
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steps = steps || 15, // 121
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// 15 sided circle // 122
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poly = [[center[0], center[1]]]; // 123
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for (var i = 0; i < steps; i++) { // 124
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var brng = 2 * Math.PI * i / steps; // 125
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var lat = Math.asin(Math.sin(radCenter[0]) * Math.cos(dist) // 126
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+ Math.cos(radCenter[0]) * Math.sin(dist) * Math.cos(brng)); // 127
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var lng = radCenter[1] + Math.atan2(Math.sin(brng) * Math.sin(dist) * Math.cos(radCenter[0]), // 128
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Math.cos(dist) - Math.sin(radCenter[0]) * Math.sin(lat)); // 129
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poly[i] = []; // 130
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poly[i][1] = gju.numberToDegree(lat); // 131
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poly[i][0] = gju.numberToDegree(lng); // 132
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} // 133
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return { // 134
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"type": "Polygon", // 135
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"coordinates": [poly] // 136
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}; // 137
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} // 138
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// 139
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// assumes rectangle starts at lower left point // 140
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gju.rectangleCentroid = function (rectangle) { // 141
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var bbox = rectangle.coordinates[0]; // 142
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var xmin = bbox[0][0], // 143
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ymin = bbox[0][1], // 144
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xmax = bbox[2][0], // 145
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ymax = bbox[2][1]; // 146
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var xwidth = xmax - xmin; // 147
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var ywidth = ymax - ymin; // 148
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return { // 149
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'type': 'Point', // 150
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'coordinates': [xmin + xwidth / 2, ymin + ywidth / 2] // 151
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}; // 152
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} // 153
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// 154
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// from http://www.movable-type.co.uk/scripts/latlong.html // 155
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gju.pointDistance = function (pt1, pt2) { // 156
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var lon1 = pt1.coordinates[0], // 157
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lat1 = pt1.coordinates[1], // 158
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lon2 = pt2.coordinates[0], // 159
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lat2 = pt2.coordinates[1], // 160
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dLat = gju.numberToRadius(lat2 - lat1), // 161
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dLon = gju.numberToRadius(lon2 - lon1), // 162
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a = Math.pow(Math.sin(dLat / 2), 2) + Math.cos(gju.numberToRadius(lat1)) // 163
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* Math.cos(gju.numberToRadius(lat2)) * Math.pow(Math.sin(dLon / 2), 2), // 164
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c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)); // 165
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// Earth radius is 6371 km // 166
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return (6371 * c) * 1000; // returns meters // 167
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}, // 168
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// 169
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// checks if geometry lies entirely within a circle // 170
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// works with Point, LineString, Polygon // 171
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gju.geometryWithinRadius = function (geometry, center, radius) { // 172
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if (geometry.type == 'Point') { // 173
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return gju.pointDistance(geometry, center) <= radius; // 174
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} else if (geometry.type == 'LineString' || geometry.type == 'Polygon') { // 175
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var point = {}; // 176
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var coordinates; // 177
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if (geometry.type == 'Polygon') { // 178
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// it's enough to check the exterior ring of the Polygon // 179
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coordinates = geometry.coordinates[0]; // 180
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} else { // 181
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coordinates = geometry.coordinates; // 182
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} // 183
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for (var i in coordinates) { // 184
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point.coordinates = coordinates[i]; // 185
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if (gju.pointDistance(point, center) > radius) { // 186
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return false; // 187
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} // 188
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} // 189
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} // 190
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return true; // 191
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} // 192
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// 193
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// adapted from http://paulbourke.net/geometry/polyarea/javascript.txt // 194
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gju.area = function (polygon) { // 195
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var area = 0; // 196
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// TODO: polygon holes at coordinates[1] // 197
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var points = polygon.coordinates[0]; // 198
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var j = points.length - 1; // 199
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var p1, p2; // 200
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// 201
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for (var i = 0; i < points.length; j = i++) { // 202
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var p1 = { // 203
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x: points[i][1], // 204
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y: points[i][0] // 205
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}; // 206
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var p2 = { // 207
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x: points[j][1], // 208
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y: points[j][0] // 209
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}; // 210
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area += p1.x * p2.y; // 211
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area -= p1.y * p2.x; // 212
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} // 213
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// 214
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area /= 2; // 215
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return area; // 216
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}, // 217
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// 218
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// adapted from http://paulbourke.net/geometry/polyarea/javascript.txt // 219
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gju.centroid = function (polygon) { // 220
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var f, x = 0, // 221
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y = 0; // 222
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// TODO: polygon holes at coordinates[1] // 223
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var points = polygon.coordinates[0]; // 224
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var j = points.length - 1; // 225
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var p1, p2; // 226
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// 227
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for (var i = 0; i < points.length; j = i++) { // 228
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var p1 = { // 229
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x: points[i][1], // 230
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y: points[i][0] // 231
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}; // 232
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var p2 = { // 233
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x: points[j][1], // 234
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y: points[j][0] // 235
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}; // 236
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f = p1.x * p2.y - p2.x * p1.y; // 237
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x += (p1.x + p2.x) * f; // 238
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y += (p1.y + p2.y) * f; // 239
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} // 240
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// 241
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f = gju.area(polygon) * 6; // 242
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return { // 243
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'type': 'Point', // 244
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'coordinates': [y / f, x / f] // 245
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}; // 246
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}, // 247
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// 248
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gju.simplify = function (source, kink) { /* source[] array of geojson points */ // 249
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/* kink in metres, kinks above this depth kept */ // 250
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/* kink depth is the height of the triangle abc where a-b and b-c are two consecutive line segments */ // 251
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kink = kink || 20; // 252
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source = source.map(function (o) { // 253
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return { // 254
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lng: o.coordinates[0], // 255
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lat: o.coordinates[1] // 256
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} // 257
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}); // 258
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// 259
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var n_source, n_stack, n_dest, start, end, i, sig; // 260
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var dev_sqr, max_dev_sqr, band_sqr; // 261
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var x12, y12, d12, x13, y13, d13, x23, y23, d23; // 262
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var F = (Math.PI / 180.0) * 0.5; // 263
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var index = new Array(); /* aray of indexes of source points to include in the reduced line */ // 264
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var sig_start = new Array(); /* indices of start & end of working section */ // 265
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var sig_end = new Array(); // 266
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// 267
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/* check for simple cases */ // 268
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// 269
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if (source.length < 3) return (source); /* one or two points */ // 270
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// 271
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/* more complex case. initialize stack */ // 272
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// 273
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n_source = source.length; // 274
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band_sqr = kink * 360.0 / (2.0 * Math.PI * 6378137.0); /* Now in degrees */ // 275
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band_sqr *= band_sqr; // 276
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n_dest = 0; // 277
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sig_start[0] = 0; // 278
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sig_end[0] = n_source - 1; // 279
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n_stack = 1; // 280
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// 281
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/* while the stack is not empty ... */ // 282
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while (n_stack > 0) { // 283
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// 284
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/* ... pop the top-most entries off the stacks */ // 285
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// 286
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start = sig_start[n_stack - 1]; // 287
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end = sig_end[n_stack - 1]; // 288
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n_stack--; // 289
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// 290
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if ((end - start) > 1) { /* any intermediate points ? */ // 291
|
||
|
|
// 292
|
||
|
|
/* ... yes, so find most deviant intermediate point to // 293
|
||
|
|
either side of line joining start & end points */ // 294
|
||
|
|
// 295
|
||
|
|
x12 = (source[end].lng() - source[start].lng()); // 296
|
||
|
|
y12 = (source[end].lat() - source[start].lat()); // 297
|
||
|
|
if (Math.abs(x12) > 180.0) x12 = 360.0 - Math.abs(x12); // 298
|
||
|
|
x12 *= Math.cos(F * (source[end].lat() + source[start].lat())); /* use avg lat to reduce lng */ // 299
|
||
|
|
d12 = (x12 * x12) + (y12 * y12); // 300
|
||
|
|
// 301
|
||
|
|
for (i = start + 1, sig = start, max_dev_sqr = -1.0; i < end; i++) { // 302
|
||
|
|
// 303
|
||
|
|
x13 = source[i].lng() - source[start].lng(); // 304
|
||
|
|
y13 = source[i].lat() - source[start].lat(); // 305
|
||
|
|
if (Math.abs(x13) > 180.0) x13 = 360.0 - Math.abs(x13); // 306
|
||
|
|
x13 *= Math.cos(F * (source[i].lat() + source[start].lat())); // 307
|
||
|
|
d13 = (x13 * x13) + (y13 * y13); // 308
|
||
|
|
// 309
|
||
|
|
x23 = source[i].lng() - source[end].lng(); // 310
|
||
|
|
y23 = source[i].lat() - source[end].lat(); // 311
|
||
|
|
if (Math.abs(x23) > 180.0) x23 = 360.0 - Math.abs(x23); // 312
|
||
|
|
x23 *= Math.cos(F * (source[i].lat() + source[end].lat())); // 313
|
||
|
|
d23 = (x23 * x23) + (y23 * y23); // 314
|
||
|
|
// 315
|
||
|
|
if (d13 >= (d12 + d23)) dev_sqr = d23; // 316
|
||
|
|
else if (d23 >= (d12 + d13)) dev_sqr = d13; // 317
|
||
|
|
else dev_sqr = (x13 * y12 - y13 * x12) * (x13 * y12 - y13 * x12) / d12; // solve triangle // 318
|
||
|
|
if (dev_sqr > max_dev_sqr) { // 319
|
||
|
|
sig = i; // 320
|
||
|
|
max_dev_sqr = dev_sqr; // 321
|
||
|
|
} // 322
|
||
|
|
} // 323
|
||
|
|
// 324
|
||
|
|
if (max_dev_sqr < band_sqr) { /* is there a sig. intermediate point ? */ // 325
|
||
|
|
/* ... no, so transfer current start point */ // 326
|
||
|
|
index[n_dest] = start; // 327
|
||
|
|
n_dest++; // 328
|
||
|
|
} else { /* ... yes, so push two sub-sections on stack for further processing */ // 329
|
||
|
|
n_stack++; // 330
|
||
|
|
sig_start[n_stack - 1] = sig; // 331
|
||
|
|
sig_end[n_stack - 1] = end; // 332
|
||
|
|
n_stack++; // 333
|
||
|
|
sig_start[n_stack - 1] = start; // 334
|
||
|
|
sig_end[n_stack - 1] = sig; // 335
|
||
|
|
} // 336
|
||
|
|
} else { /* ... no intermediate points, so transfer current start point */ // 337
|
||
|
|
index[n_dest] = start; // 338
|
||
|
|
n_dest++; // 339
|
||
|
|
} // 340
|
||
|
|
} // 341
|
||
|
|
// 342
|
||
|
|
/* transfer last point */ // 343
|
||
|
|
index[n_dest] = n_source - 1; // 344
|
||
|
|
n_dest++; // 345
|
||
|
|
// 346
|
||
|
|
/* make return array */ // 347
|
||
|
|
var r = new Array(); // 348
|
||
|
|
for (var i = 0; i < n_dest; i++) // 349
|
||
|
|
r.push(source[index[i]]); // 350
|
||
|
|
// 351
|
||
|
|
return r.map(function (o) { // 352
|
||
|
|
return { // 353
|
||
|
|
type: "Point", // 354
|
||
|
|
coordinates: [o.lng, o.lat] // 355
|
||
|
|
} // 356
|
||
|
|
}); // 357
|
||
|
|
} // 358
|
||
|
|
// 359
|
||
|
|
// http://www.movable-type.co.uk/scripts/latlong.html#destPoint // 360
|
||
|
|
gju.destinationPoint = function (pt, brng, dist) { // 361
|
||
|
|
dist = dist/6371; // convert dist to angular distance in radians // 362
|
||
|
|
brng = gju.numberToRadius(brng); // 363
|
||
|
|
// 364
|
||
|
|
var lat1 = gju.numberToRadius(pt.coordinates[0]); // 365
|
||
|
|
var lon1 = gju.numberToRadius(pt.coordinates[1]); // 366
|
||
|
|
// 367
|
||
|
|
var lat2 = Math.asin( Math.sin(lat1)*Math.cos(dist) + // 368
|
||
|
|
Math.cos(lat1)*Math.sin(dist)*Math.cos(brng) ); // 369
|
||
|
|
var lon2 = lon1 + Math.atan2(Math.sin(brng)*Math.sin(dist)*Math.cos(lat1), // 370
|
||
|
|
Math.cos(dist)-Math.sin(lat1)*Math.sin(lat2)); // 371
|
||
|
|
lon2 = (lon2+3*Math.PI) % (2*Math.PI) - Math.PI; // normalise to -180..+180º // 372
|
||
|
|
// 373
|
||
|
|
return { // 374
|
||
|
|
'type': 'Point', // 375
|
||
|
|
'coordinates': [gju.numberToDegree(lat2), gju.numberToDegree(lon2)] // 376
|
||
|
|
}; // 377
|
||
|
|
}; // 378
|
||
|
|
// 379
|
||
|
|
})(); // 380
|
||
|
|
// 381
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
}).call(this);
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
(function () {
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// //
|
||
|
|
// packages/geojson-utils/post.js //
|
||
|
|
// //
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// This exports object was created in pre.js. Now copy the `exports` object // 1
|
||
|
|
// from it into the package-scope variable `GeoJSON`, which will get exported. // 2
|
||
|
|
GeoJSON = module.exports; // 3
|
||
|
|
// 4
|
||
|
|
// 5
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
}).call(this);
|
||
|
|
|
||
|
|
|
||
|
|
/* Exports */
|
||
|
|
if (typeof Package === 'undefined') Package = {};
|
||
|
|
Package['geojson-utils'] = {
|
||
|
|
GeoJSON: GeoJSON
|
||
|
|
};
|
||
|
|
|
||
|
|
})();
|
||
|
|
|
||
|
|
//# sourceMappingURL=geojson-utils.js.map
|