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Mitasova, H., Mitas, L., Brown, W.M., Gerdes, D.P., Kosinovsky, I., Baker, T., International Journal of Geographical Information Systems (London: Taylor & Francis), vol. 9, no. 4, pp. 433-446.
The concept of GRASS (Geographic Resources Analysis Support System) as an open system has created a favorable environment for integration of process based modeling and GIS. To support this integration a new generation of tools is being developed in the following areas: a) interpolation from multidimensional scattered point data, b) analysis of surfaces and hypersurfaces, c) modeling of spatial processes, d) 3D dynamic visualization. Examples of two applications are given - spatial and temporal modeling of erosion and deposition, and multivariate interpolation and visualization of nitrogen concentrations in the Chesapeake Bay.