A Spatial Microsimulation Approach to Estimating the Total Number and Economic Value of Site Visits in Travel Cost Modelling

This paper presents a simulation-based modelling approach for simultaneously estimating the total number and aggregate value of recreation-related visits to a small-scale community forest in the West of Ireland. Spatially-referenced simulated individuals from a spatial microsimulation model for Ireland (SMILE) who reside within the geographic extent of the market for recreation at the forest are identified using GIS techniques. A travel cost model, adjusted for truncation and endogenous stratification, is estimated for a sample of visitors to the site and transferred across each individual in the simulated population. The SMILE model and GIS-based network analysis are used to derive the appropriate values for the explanatory variables in the transfer. Each simulated individual’s latent demand for visits to the site is predicted and summed, in order to derive aggregate visits and amenity value estimates. The paper makes two principal contributions. First, it sets out a new approach for modelling the geographic extent of the market for recreation using survey data on reported travel distances and GIS techniques. Second, it develops a new simulation-based modelling approach for predicting total site visits at non-priced open-access recreation sites.

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