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:
- simple entries which correspond to a named entity (Paris, Vienna, ...)
- complex entries which are derived from simple ones (south of Paris, ...)
- Average Precision (AP) for each topic
- Mean Average Precision (MAP) for all topics