The image is taken from Thomas Poguntke; Susan Scarrow; Paul Webb, 2016, “Political Party Database Round 1a”, doi:10.7910/DVN/0NM7KZ, Harvard Dataverse, V1, UNF:6:o3fNmqeh9zXTPjfdcQFDQA==
The Political Party Database is a multi-country collaborative research project aimed at studying the transformation of political parties across different national contexts. The first round of data is focused on 19 countries and 122 political parties, classified according to their ideology, organization, leadership, representative rules, and membership.
The research is led by Susan E. Scarrow, Paul D. Webb and Thomas Poguntke, and funded by the National Science Foundation (USA), the Deutsche Forschungsgemeinshaft (Germany) and the Economic and Social Research Council (United Kingdom) under Open Research Area for the Social Sciences (ORA) and several others organizations in the United States and Europe.
The website contains data, references, and country profiles: http://www.politicalpartydb.org/