RT Journal Article SR Electronic T1 Evaluating Mobility Data for Recreation Monitoring JF Land Economics FD University of Wisconsin Press SP 437 OP 454 DO 10.3368/le.102.3.011626-0006 VO 102 IS 3 A1 Duff, Cameron A1 Antia, Alice A1 Hilger, James A1 Horsch, Eric A1 Merrill, Nathaniel A1 Murray, Jason A1 Winder, Samantha A1 Wood, Spencer A1 Zafonte, Matthew YR 2026 UL http://le.uwpress.org/content/102/3/437.abstract AB Mobile device location data (or mobility data [MD]) are a novel and exciting source of information for recreational monitoring. 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.