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Lucene Geographic and Temporal Extensions (LGTE) is an information retrieval tool developed at Technical University of Lisbon which can be used as a search engine or as evaluation system for information retrieval techniques for research purposes. LGTE is the IR system behind DIGMAP. It is based on Lucense with a multinomial language modeling extension.

LGTE introduces several extensions for dealing with geographical and temporal information. The package also includes utilities for information retrieval evaluation, such as classes for handling CLEF/TREC (Cross Language Evaluation Forúm/Text Retrieval Conference) topics and document collections.

LGTE is a layer on the top of Lucene and provides an extended Lucene API to integrate several services like snippets generation, query expansion, and many others. A set of unit tests is provided.

 LGTE 1.1.9

Free to download


New BSD License

Technical University of Lisbon


System Requirements


Selected Reviews:

Features include:

  • Provides a simple and effective abstraction layer on top of Lucene
  • Supports integrated retrieval and ranking with basis on thematic, temporal and geographical aspects
  • Supports the Lucene standard retrieval model, as well as the more advanced probabilistic retrieval approaches
  • Supports Rochio Query Expansion
  • Provides a framework for IR evaluation experiments (e.g. handling CLEF/TREC topics)
  • Includes a Java alternative to the trec_eval tool, capable of performing significance tests over pairs of runs
  • Includes a simple test application for searching over the Braun Corpus or the Cranfield Corpus
  • TREC/CLEF Evaluation Framework - a tool to index a collection, run a set of search topics and output the results in treckeval format
  • Provides Isolated Fields using different folders
  • Provides Hierarchic indexes through foreign key fields
  • Provides classes to parse documents using Yahoo PlaceMaker

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Last Updated Monday, April 20 2015 @ 02:40 PM EDT

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