The links below provide additional insightful information behind the creation of the geospatial corpus:
Stock, K., Pasley, R. C., Brindley P., Morley, J., Cialone, C. (2011): Creating a Corpus of Spatial Language (forthcoming).
Montello, D.R. (1993): Scale and Multiple Psychologies of Space. In A.U. Frank and I.Campari (Eds.), Spatial Information Theory: A theoretical basis for GIS, pp. 312-321. Berlin : Springer Verlag, Lecture Notes in Computer Science, 716.