An Integrated GIS-AnnAGNPS Modeling Interface for Non-Point Source Pollution Assessment

AnnAGNPS (Annualized AGricultural Non-point Source), a continuous simulation and distributed pollution model, is widely applied in evaluating non-point source pollution and watershed management practices. However, the complexity of required input data and modeling procedure keep it from being an efficient modeling tool. An integrated GIS interface was developed to facilitate organizing and preparing the input data, running the model, and visualizing modeling and management results. The interface operated in ArcGIS environment as a new toolbar that was developed with Microsoft Visual Basic. It consists of three major components: topographic data processing, soil and land use related data manipulation, model output visualizing.