LGTE

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.

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 Wednesday, April 03 2013 @ 07:07 AM EST