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There has been some metaphysical debate over whether such features are "real", independent of the human mind (a realist stance), whether they are purely human conceptualizations of continuous natural phenomena (a constructivist stance), or a hybrid of discrete natural phenomena that highly motivate, but are simplified by human concepts (a experientialist stance). It is also possible that individual features may be of any of these three types. Frank, Andrew U. (2003). "Ontology for Spatio-Temporal Databases". In Sellis, Timos (ed.). Spatio-Temporal Databases: The Chorochronos Approach. Lecture Notes in Computer Science. Vol. V.2520. Springer-Verlag. pp. 9–77. doi:10.1007/978-3-540-45081-8_2. ISBN978-3-540-40552-8.
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Fegeas, Robin G.; Cascio, Janette L.; Lazar, Robert A. (1992). "An Overview of FIPS 173, The Spatial Data Transfer Standard". Cartography and Geographic Information Systems. 19 (5): 278–293. Bibcode:1992CGISy..19..278F. doi:10.1559/152304092783762209.
Mennis, Jeremy; Peuquet, Donna J.; Qian, L. (2000). "A geographical database representation". International Journal of Geographical Information Science. 14 (6): 501–520. doi:10.1080/136588100415710. S2CID7458359.