def generate_points lat, lon, radius
      return [] unless lon && lat && GeoPolygon.is_lonlat_inside_mkad(lon, lat)

      points = []
      10.times do |i|
        point = random_point(lat, lon, radius)
        point["id"] = i
        points << point
      end
      points
    end

    def random_point(lat, lon, rad)
      a = 2 * Math::PI * rand
      r = rad * Math.sqrt(rand) * 180 / (6371.01 * Math::PI)
      dx = r * Math.cos(a)
      dy = r * Math.sin(a)
      {
        lon: lon + dx,
        lat: lat + dy,
      }
    end