@turf/area/dist/cjs/index.cjs.map

turf area module

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G. Chamberlain and William H. Duquette, \"Some Algorithms for Polygons on a Sphere\",\n * JPL Publication 07-03, Jet Propulsion\n * Laboratory, Pasadena, CA, June 2007 https://trs.jpl.nasa.gov/handle/2014/40409\n *\n * @param {Array<Array<number>>} coords Ring Coordinates\n * @returns {number} The approximate signed geodesic area of the polygon in square meters.\n */\nfunction ringArea(coords: number[][]): number {\n  const coordsLength = coords.length - 1;\n\n  if (coordsLength <= 2) return 0;\n  let total = 0;\n\n  let i = 0;\n  while (i < coordsLength) {\n    const lower = coords[i];\n    const middle = coords[i + 1 === coordsLength ? 0 : i + 1];\n    const upper =\n      coords[i + 2 >= coordsLength ? (i + 2) % coordsLength : i + 2];\n\n    const lowerX = lower[0] * PI_OVER_180;\n    const middleY = middle[1] * PI_OVER_180;\n    const upperX = upper[0] * PI_OVER_180;\n\n    total += (upperX - lowerX) * Math.sin(middleY);\n\n    i++;\n  }\n\n  return total * FACTOR;\n}\n\nexport { area };\nexport default area;\n"]}