How to kml export some band widths

kml_exporter.rb

require 'utils/gis/link_to_polygon_converter'
require 'utils/gis/tab_file_writer'

  def kml_output
    links_to_export = get_links_to_export('LinkType', [15,16,17,19]) # [linknr1, linknr2, ...]
    links    = OtSpatialReader.new.readLinks.reject { |linknr, _| !links_to_export.include?(linknr) }

    polygons_by_linknr = links.map_values { |line| LinkToPolygonConverter.translate(line, $Ot.project.city) }
    polygons_by_linknr_dirn = polygons_by_linknr.each_with_object({}) { |(linknr, (poly1,poly2)), memo|
      memo[[linknr, 1]] = poly1
      memo[[linknr, 2]] = poly2
    }

    # This constructs a hash from [linknr,direction] -> [p,m,t,u,r,i] -> load
    loads_by_linknr_dirn_and_pmturi = LinkLoadExtractor.get_loads_by_linknr_pmturi(nil, 1, links_to_export)
    vc_ratio_pmturi = [1,1,1,1,100,1]

    vc_ratio_by_linknr_dirn =
      loads_by_linknr_dirn_and_pmturi.map_values { |_linknr_dirn, loads_by_pmturi| loads_by_pmturi[vc_ratio_pmturi] }

    polygons_by_linknr_dirn.each { |linknr_dirn, polygon|
      vc_ratio = vc_ratio_by_linknr_dirn.fetch(linknr_dirn, 1.0)
      polygon.mi_style = get_style(vc_ratio)
      polygon.data['vc_ratio'] = vc_ratio
    }

    fields = [{ :name => "vc_ratio", :type => 'Float', :index => false }]
    TabFileWriter.writeFromArray(filename, polygons_by_linknr_dirn.values, fields)
  end

  def get_style(vc_ratio)
    brush = Mapinfo::Brush.new(2,'red','red')
    pen   = case
            when vc_ratio > 1.0 then Mapinfo::Pen.new(3,2,'red')
            when vc_ratio > 0.8 then Mapinfo::Pen.new(3,2,'light red')
            else                     Mapinfo::Pen.new(3,2,'green')
            end
    { :pen => pen, :brush => brush }
  end