百度坐标转换WGS坐标后再次转换为百度坐标位置错误

[cdonsun]

源码
bd_lng = result_json["lng"].to_f
bd_lat = result_json["lat"].to_f
wgs = Coordconver.bd_wgs(bd_lng, bd_lat)
wgs_lng = wgs[0]
wgs_lat = wgs[1]
back = Coordconver.wgs_bd(wgs_lng, wgs_lat)
back_lng = back[0]
back_lat = back[1]
puts "bd_lng, bd_lat => #{bd_lng}, #{bd_lat}"
puts "wgs_lng, wgs_lat => #{wgs_lng}, #{wgs_lat}"
puts "back_lng, back_lat => #{back_lng}, #{back_lat}"
输出
bd_lng, bd_lat => 121.63503, 38.872152
wgs_lng, wgs_lat => 121.64654269392807, 38.87874207794424
back_lng, back_lat => 121.65801436918794, 38.885567387479554

[cdonsun]

  # 百度坐标系 (BD-09)  -> 地球坐标 (WGS-84)
  # 即 百度  -> 地球坐标
  # Coordconver.bd_wgs(lng, lat)
  def bd_wgs(lng, lat)
    loca = wgs_gcj(lng, lat)
    gcj_bd(loca[0], loca[1])
  end

朋友，这段代码写错了