[KDD 2020] An Automatic Approach for Generating Rich, Linked Geo-Metadata from Historical Map Images
Aug 13, 20207 views
Historical maps contain detailed geographic information difficult,to find elsewhere covering long-periods of time (e.g., 125 years for,the historical topographic maps in the US). However, these maps,typically exist as scanned images without searchable metadata. Existing approaches making historical maps searchable rely on tedious,manual work (including crowd-sourcing) to generate the metadata,(e.g., geolocations and keywords). Optical character recognition,(OCR) software could alleviate the required manual work, but the,recognition results are individual words instead of location phrases,(e.g., “Black” and “Mountain” vs. “Black Mountain”). This paper,presents an end-to-end approach to address the real-world problem of finding and indexing historical map images. This approach,automatically processes historical map images to extract their text,content and generates a set of metadata that is linked to large external geospatial knowledge bases. The linked metadata in the RDF,(Resource Description Framework) format support complex queries,for finding and indexing historical maps, such as retrieving all historical maps covering mountain peaks higher than 1,000 meters in,California. We have implemented the approach in a system called,mapKurator. We have evaluated mapKurator using historical maps,from several sources with various map styles, scales, and coverage.,Our results show significant improvement over the state-of-the-art,methods. The code has been made publicly available as modules of,the Kartta Labs project at https://github.com/kartta-labs/Project.