Ground reference data in the form of ecogeomorphic evaluations, topographic survey measurements, and geotagged photographs were collected at four areas of interest (AOI) across Fire Island National Seashore (FIIS), NY, USA September 16-19, 2024, that document site conditions. The overall goals of USGS personnel for the data collection were to: (1) collect ground reference data that assist in the visual interpretation of aerial imagery to produce maps that show changes on the island over time (e.g. land cover changes), and (2) collect ground reference data that will be used to train conditional probability distributions among variables for a Bayesian network that would predict landcover/ecogeomorphic state based on elevation, plant functional type, and distance from ocean shoreline.