Convert the Geometry hash from a Geojson Feature to WKT

gistfile1.rb

def convert_to_wkt_string geometry
  if geometry['type'] == "Polygon"
    wkt_string [geometry["coordinates"]]
  else
    wkt_string geometry["coordinates"]
  end
end

def wkt_string coordinates
  "MULTIPOLYGON #{format_outer_polygons coordinates}"
end

def format_outer_polygons coordinates
  "(#{coordinates.map { |outer_poly| format_inner_polygons outer_poly }.join ", "})"
end

def format_inner_polygons polys
  "(#{polys.map { |poly| format_point_pairs poly}.join ", "})"
end

def format_point_pairs pairs
  "(#{pairs.map { |pair| pair.join " " }.join ", "})"
end