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In this paper, we will present ILARIS--an ArcGIS ModelBuiler model developed for the purpose of identifying intrinsic landscape visual resources and measuring the magnitude of aesthetic expression of these resources in the Puget Sound estuary nearshore basins. The model consists of 40 sub-models and 3 Python scripts, with more than 60 input data layers. We will show a conceptual framework which feeds into the design of the model architecture; display some sub-models responsible for capturing the presence, quantity and visual properties of different intrinsic landscape forms for measuring the aesthetic values of an analysis unit in terms of the expressiveness of these landscape forms, the visual diversity, visual integrity, and intrinsic aesthetic quality, as well as the effect of the viewshed and the relative uniqueness of the landscape on landscape significance in each reach basin analysis unit. We will also discuss design and implementation issues encountered during this project.