Abstract: In order to effectively solve the problem of static integrating mode of models in distributed collaborative geographic modeling environment, this paper proposes several decomposition principles of geographic modeling tasks such as function structure, computational complexity, organization multiplicity, and spatiotemporal scales by analyzing the decomposable process of distributed collaborative geographic modeling tasks. Hierarchical Task Network (HTN) planning is adopted to reach formalized expression of the geographic modeling tasks, in the meanwhile, Ordered Task Decomposition (OTD) is also applied to design recursive decomposition algorithm of modeling tasks. Ultimately, the modeling tasks are tessellated, decomposed and expanded to subtask network. With the adoption of SWAT model as an experimental case, HTN-based geographic modeling task planner was developed and realized. The experiment shows that the decomposition method of distributed collaborative geographic modeling tasks possesses preferable flexibility, intelligence and adaptability.

Key words: distributed collaborative geographic modeling, hierarchical task network(HTN) planning, formalized expression, ordered task decomposition(OTD)