What's there and what's not? Focused crawling for missing documents in digital libraries

Ziming Zhuang, Rohit Wagle, C. Lee Giles

Research output: Contribution to journalConference articlepeer-review

34 Scopus citations


Some large scale topical digital libraries, such as CiteSeer, harvest online academic documents by crawling open-access archives, university and author homepages, and authors' self-submissions. While these approaches have so far built reasonable size libraries, they can suffer from having only a portion of the documents from specific publishing venues. We propose to use alternative online resources and techniques that maximally exploit other resources to build the complete document collection of any given publication venue. We investigate the feasibility of using publication metadata to guide the crawler towards authors' homepages to harvest what is missing from a digital library collection. We collect a real-world dataset from two Computer Science publishing venues, involving a total of 593 unique authors over a time frame of 1998 to 2004. We then identify the missing papers that are not indexed by CiteSeer. Using a fully automatic heuristic-based system that has the capability of locating authors' homepages and then using focused crawling to download the desired papers, we demonstrate that it is practical to harvest using a focused crawler academic papers that are missing from our digital library. Our harvester achieves a performance with an average recall level of 0.82 overall and 0.75 for those missing documents. Evaluation of the crawler's performance based on the harvest rate shows definite advantages over other crawling approaches and consistently outperforms a defined baseline crawler on a number of measures.

Original languageEnglish (US)
Pages (from-to)301-310
Number of pages10
JournalProceedings of the ACM/IEEE Joint Conference on Digital Libraries
StatePublished - Nov 10 2005
Event5th ACM/IEEE Joint Conference on Digital Libraries - Digital Libraries: Cyberinfrastructure for Research and Education - Denver, CO, United States
Duration: Jun 7 2005Jun 11 2005

All Science Journal Classification (ASJC) codes

  • General Engineering


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