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This paper presents how agronomists and computer engineers worked together on spatial modeling in order to compare farms and infer feasible functioning modes. Agronomists involved in this multidisciplinary project aimed at advances in dealing with spatial organization of studied cases, and in stabilizing related tools. A particular matter was graphic modeling with choremes borrowed from geography. Computer engineers formalized the knowledge thus obtained into graphs, as a way to memorize case studies and make their use easier for dealing with new cases: that is identifying and interpreting spatial structures. Joint use of choremes and graphs opens onto generic knowledge of spatial representations to be processed and transformed in agronomy.