geospatial

makesquarearea.js

const makeSquareAreaFromLatLng = function (lat, lng, distance = 10) {
  const lat_change = distance / 111.2;
  const lon_change = (Math.abs(Math.cos(lat * (Math.PI / 180)))) / 4;
  const circlePoints = [];

  const bounds = {
    lat_min: lat - lat_change,
    lon_min: lng - lon_change,
    lat_max: lat + lat_change,
    lon_max: lng + lon_change
  };

  circlePoints.push([bounds.lon_min, bounds.lat_max]);
  circlePoints.push([bounds.lon_max, bounds.lat_max]);
  circlePoints.push([bounds.lon_max, bounds.lat_min]);
  circlePoints.push([bounds.lon_min, bounds.lat_min]);
  circlePoints.push([bounds.lon_min, bounds.lat_max]);

  return circlePoints;
};