Albert Weichselbraun

is a Professor of Information Science at the University of Applied of the Grisons.

Spatial and Temporal Information

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based on "Normalizing Spatial Information to Better Combine Criteria in Geographical Information Retrieval" y Palacio et al. (ECIR 2009).

There are two types of spatial information:

  1. simple entries which correspond to a named entity (Paris, Vienna, ...)
  2. complex entries which are derived from simple ones (south of Paris, ...)

The same schema is applicable to temporal information (e.g. January 2011 versus after January 2011).

Standard evaluation metrics for IRS (IR Systems):

  • Average Precision (AP) for each topic
  • Mean Average Precision (MAP) for all topics

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Suffix array

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The suffix array is a memory-efficient alternative to the suffix tree which provides a sorted list of string indices indicating the string’s suffixes.