<p>Since 1983, the Spanish administration publish the national land prices survey, whose main objective is to measure the prices evolution of agricultural land. The Survey provides objective reference prices without speculative effects, by Autonomous Communities and differentiated by the most representative uses in each one of them. We start from the hypothesis that the land value is conditioned by its location. We want analyst the spatial correlation between the prices publicized or it is necessary different grouping or if it is necessary to introduce new location correction factors.</p>