!function(e){"object"==typeof exports?module.exports=e():"function"==typeof define&&define.amd?define(e):"undefined"!=typeof window?window.geojsonRewind=e():"undefined"!=typeof global?global.geojsonRewind=e():"undefined"!=typeof self&&(self.geojsonRewind=e())}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o= 0; } },{"geojson-area":2}],2:[function(require,module,exports){ var wgs84 = require('wgs84'); module.exports.geometry = geometry; module.exports.ring = ringArea; function geometry(_) { if (_.type === 'Polygon') return polygonArea(_.coordinates); else if (_.type === 'MultiPolygon') { var area = 0; for (var i = 0; i < _.coordinates.length; i++) { area += polygonArea(_.coordinates[i]); } return area; } else { return null; } } function polygonArea(coords) { var area = 0; if (coords && coords.length > 0) { area += Math.abs(ringArea(coords[0])); for (var i = 1; i < coords.length; i++) { area -= Math.abs(ringArea(coords[i])); } } return area; } /** * Calculate the approximate area of the polygon were it projected onto * the earth. Note that this area will be positive if ring is oriented * clockwise, otherwise it will be negative. * * Reference: * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for * Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion * Laboratory, Pasadena, CA, June 2007 http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409 * * Returns: * {float} The approximate signed geodesic area of the polygon in square * meters. */ function ringArea(coords) { var area = 0; if (coords.length > 2) { var p1, p2; for (var i = 0; i < coords.length - 1; i++) { p1 = coords[i]; p2 = coords[i + 1]; area += rad(p2[0] - p1[0]) * (2 + Math.sin(rad(p1[1])) + Math.sin(rad(p2[1]))); } area = area * wgs84.RADIUS * wgs84.RADIUS / 2; } return area; } function rad(_) { return _ * Math.PI / 180; } },{"wgs84":3}],3:[function(require,module,exports){ module.exports.RADIUS = 6378137; module.exports.FLATTENING = 1/298.257223563; module.exports.POLAR_RADIUS = 6356752.3142; },{}]},{},[1]) (1) }); ;