RT Journal Article SR Electronic T1 Evaluating Mobility Data for Recreation Monitoring JF Land Economics JO Land Econ FD University of Wisconsin Press SP 011626-0006 DO 10.3368/le.102.3.011626-0006 A1 Duff, Cameron A1 Antia, Alice A1 Hilger, James A1 Horsch, Eric A1 Merrill, Nathaniel A1 Murray, Jason A1 Winder, Sama A1 Wood, Spencer A1 Zafonte, Matthew YR 2026 UL http://le.uwpress.org/content/early/2026/03/05/le.102.3.011626-0006.abstract AB Mobile device location data (or mobility data, MD) are a novel and exciting source of information for recreational monitoring. In this paper we analyze datasets from four commercial vendors across three case studies to illustrate some important challenges. Our results show inconsistent spatial-temporal patterns and correlations with on-site counts. Given this evidence, we describe a conceptual model of the potential sources of error and structural variability in visitation estimates derived from MD. We discuss approaches for evaluation of data quality and suggest a range of supplemental data products that vendors could provide to support recreation analysis.