​

console.clear();

const data = [

  [

    42.890625,

    53.330872983017066

  ],

  [

    49.5703125,

    58.81374171570782

  ],

  [

    49.92187499999999,

    54.57206165565852

  ],

  [

    57.30468749999999,

    56.75272287205736

  ],

  [

    57.65624999999999,

    52.05249047600099

  ],

  [

    57.30468749999999,

    56.75272287205736

  ],

  [

    49.92187499999999,

    54.57206165565852

  ]

];

​

const getLineFeatures = (data) => {

  let lineFeatures = [];

  for (let idx = 0; idx < data.length - 1; idx++) {

    lineFeatures.push(turf.lineString([data[idx], data[idx + 1]]));

  }

  return lineFeatures;

}

​

​

function getFeatureCollection(features) {

  return turf.helpers.featureCollection(features);

}

​

function findOverlappingLine(lineFeatures) {

  let duplicateIndex = new Set();

  for (let xdx = 0; xdx < lineFeatures.length; xdx++) {

    const curLine = lineFeatures[xdx];

    if (duplicateIndex.has(xdx)) {

      continue;

    }

    for (let ydx = xdx + 1; ydx < lineFeatures.length; ydx++) {

      const nextline = lineFeatures[ydx];

​

      const c = turf.invariant.getCoords(curLine);

      const n = turf.invariant.getCoords(nextline);

​

      const doesOverlap = turf.booleanEqual(curLine, nextline) || turf.booleanEqual(curLine, turf.flip(nextline));

      console.log('result ' + doesOverlap);

      if (doesOverlap) {

        duplicateIndex.add(ydx);

      }

    }

  }

}

​

const lineFeatures = getLineFeatures(data);

const geoJSON = getFeatureCollection(lineFeatures);

findOverlappingLine(lineFeatures);