The map is great in the sense that it provides information of all countries at local level, but it would have been much better without those inconsistent ideological labels attached to parliamentary group affiliations. For instance the GUE-NGL group (incorporating SYRYZA, Die Linke, Sinn Fein or Unidas Podemos) is labelled "far left", while the extreme Golden Dawn (Greece) is simply labelled as "no group" and Vox (Spain) as "national conservative" alongside the Polish ultraconservative PiS. On the other hand, AfD and the Austrian "liberal" folks are regarded "far right". It makes little sense, really
It is the only possibility. Nobody wants individual dissertations on the topic "how to label the European parties correctly".