LGTE – IR system behind DIGMAP

Last Updated on July 11, 2021

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.

Website: code.google.com/archive/p/digmap/wikis/LuceneGeoTemporal.wiki
Support:
Developer: Technical University of Lisbon
License: New BSD License

LGTE is written in Java. Learn Java with our recommended free books and free tutorials.

Return to Search Engines for Big Data Home Page

Explore Linux
	Best Free and Open Source Software - A huge collection of recommended free and open source software covering every major category.
	In-depth Linux Software Reviews - Detailed assessments of Linux software covering features, usability and overall quality.
	The Big List of Active Linux Distros - An extensive collection of actively developed Linux distributions.
	Open Source Alternatives - Alternatives to software and services from Google, Microsoft, Apple, Adobe, IBM, Autodesk, Oracle and others.
	Essential Linux System Tools - Indispensable utilities for monitoring, maintaining and managing Linux systems.
	Linux Productivity Tools - Useful utilities for improving productivity and streamlining everyday tasks.
	Alternatives to Popular CLI Tools - Modern alternatives to familiar command-line utilities supplied with Linux systems.
	Awesome Free Linux Game Tools - Tools, utilities and companion software that improve gaming on Linux.
	Machine Learning on Linux - Machine learning and deep learning software, self-hosted applications and practical tools.
	Saving Money with Linux - Practical ways to reduce electricity consumption and lower computing costs with Linux.
	Linux Candy - Fun, entertaining and sometimes delightfully quirky software from the lighter side of Linux.