Core Concepts
This study introduces the use of OpenAlex data to create global science overlay maps that can be overlaid with data from individual researchers or research institutions to visualize their positioning within the broader scientific landscape.
Abstract
This study proposes a procedure for creating global overlay maps of science using the freely available OpenAlex database. The authors provide six different global base maps covering different time periods that can be used as a foundation for overlaying specific data.
The authors demonstrate the overlay technique by creating example maps for an individual researcher (the first author) and a research institution (the Max Planck Institute for Solid State Research). The raw overlay maps highlight general research concepts, while the normalized overlay maps emphasize more specialized concepts.
The authors discuss the advantages of their approach, such as the free availability of the underlying data and the ability to explore the research activities of various units. They also acknowledge limitations, including potential issues with the concept assignments in OpenAlex and the normalization method used.
The study concludes that the visualization approach based on OpenAlex data can be a useful tool for exploring the research activities of various science units. The authors suggest potential extensions, such as incorporating additional overlay data like publication quality and citation impact.
Stats
The OpenAlex database used in this study contains 243,053,925 documents.
The authors used the following time periods for their analyses:
1800-2022 with 237,876,541 documents
2008-2022 with 134,092,007 documents
2013-2022 with 95,438,459 documents
2018-2022 with 47,665,990 documents
2022 with 8,496,167 documents
Quotes
"The visualization approach based on OpenAlex data that we introduced in this study can be used for any science unit."
"Normalization of the overlay maps compares the focal unit's activity to the world's activity. Thereby, the higher level concepts loose prominence compared to lower level concepts."