The Aggregated Database on the History of Cartography (ADHOC) is a large, composite corpus for the study of historical maps. Specifically, it is composed of two distinct datasets: ADHOC Records and ADHOC Images. ADHOC Records comprises 771,561 map records compiled from the digital catalogs of 38 digital libraries in 11 countries. ADHOC Images, by contrast, contains 83,481 map records and includes 99,715 direct download links to digitized map images hosted in digital libraries.

Both datasets are part of R. Petitpierre's PhD thesis: Studying Maps at Scale: A Digital Investigation of Cartography and the Evolution of Figuration [1]. Extensive details on collection and data statistics are provided in the context of that work.