310 Revista del Instituto Español de Estudios Estratégicos Núm. 1/ 2013 EVE (Evaluation of Evidence). The objective is to detect any hint of concealment or simulation of contents of the different military sites that could reflect strategic activities or demonstrate the level of force of a country. The conclusion that has been obtained is that, despite Internet having become a source of instantaneous information, and that it is a channel with the potential to carry out deception because of the quantity of users, it is considered rather unlikely that it is present in geographic information systems (GISs), owing to the fact that the reputation of the servers could be affected and that there are other ways of comparing the information10. 4.OPAC: a geographic information quality evaluation system The countries with a high degree of exposure must be aware of the importance of having surveillance mechanisms for the information that flows through the network concerning installations of interest for security and defence. In this context, the authors propose using a set of questions to evaluate the precision of online cartographic services. The objective is to be able to draw up a checklist that can measure the quality of those systems, regardless of the magnitude of the technological progress that may take place in the future. 4.1 OPAC formulation In this case, we have used an evaluation system whose range oscillates from 1 to 5. Unless stated to the contrary, the generic significance of this system is the following: 1 2 3 4 5 Not developed Small progress Some progress Significant progress Satisfactory development Below, in tables II, III, IV and V, we group together the questions that make up the OPAC checklist (left-hand column) together with the explanations about them (middle column) and the numerical weighting system utilised for each one of these (right-hand column). 10 RUBIO, Yaiza and BREZO, Félix. Limitaciones de los motores cartográficos en línea para el analista de inteligencia Limitations on online cartographic engines for the intelligence analyst, at the 3rd International Congress on Intelligence, Barcelona (Spain), November 12, 2012.
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