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-360\n : origin[0] - destination[0] > 180\n ? 360\n : 0;\n const distanceInMeters = calculateRhumbDistance(origin, destination);\n const distance = convertLength(distanceInMeters, \"meters\", options.units);\n return distance;\n}\n\n/**\n * Returns the distance travelling from ‘this’ point to destination point along a rhumb line.\n * Adapted from Geodesy: https://github.com/chrisveness/geodesy/blob/master/latlon-spherical.js\n *\n * @private\n * @param {Array} origin point.\n * @param {Array} destination point.\n * @param {number} [radius=6371e3] - (Mean) radius of earth (defaults to radius in metres).\n * @returns {number} Distance in km between this point and destination point (same units as radius).\n *\n * @example\n * var p1 = new LatLon(51.127, 1.338);\n * var p2 = new LatLon(50.964, 1.853);\n * var d = p1.distanceTo(p2); // 40.31 km\n */\nfunction calculateRhumbDistance(\n origin: number[],\n destination: number[],\n radius?: number\n) {\n // φ => phi\n // λ => lambda\n // ψ => psi\n // Δ => Delta\n // δ => delta\n // θ => theta\n\n radius = radius === undefined ? earthRadius : Number(radius);\n // see www.edwilliams.org/avform.htm#Rhumb\n\n const R = radius;\n const phi1 = (origin[1] * Math.PI) / 180;\n const phi2 = (destination[1] * Math.PI) / 180;\n const DeltaPhi = phi2 - phi1;\n let DeltaLambda = (Math.abs(destination[0] - origin[0]) * Math.PI) / 180;\n // if dLon over 180° take shorter rhumb line across the anti-meridian:\n if (DeltaLambda > Math.PI) {\n DeltaLambda -= 2 * Math.PI;\n }\n\n // on Mercator projection, longitude distances shrink by latitude; q is the 'stretch factor'\n // q becomes ill-conditioned along E-W line (0/0); use empirical tolerance to avoid it\n const DeltaPsi = Math.log(\n Math.tan(phi2 / 2 + Math.PI / 4) / Math.tan(phi1 / 2 + Math.PI / 4)\n );\n const q = Math.abs(DeltaPsi) > 10e-12 ? DeltaPhi / DeltaPsi : Math.cos(phi1);\n\n // distance is pythagoras on 'stretched' Mercator projection\n const delta = Math.sqrt(\n DeltaPhi * DeltaPhi + q * q * DeltaLambda * DeltaLambda\n ); // angular distance in radians\n const dist = delta * R;\n\n return dist;\n}\n\nexport { rhumbDistance };\nexport default rhumbDistance;\n"]}