Catch the King Tide is a community science GPS data collection effort that annually maps king tide flooding in coastal Virginia, USA. Hundreds of volunteers map tidal flooding extents as a real-time tidal calibration to help validate and improve predictive models and future forecasting of nuisance flooding. Since 2014, more than 250,000 timestamped GPS-reported high water marks and 5500 geotagged pictures of inundation have been captured via Catch the King using the free Sea Level Rise mobile app and ArcGIS Online crowdsourcing data maps. Volunteers of Catch the King participated in this project by downloading this app on their smartphones, and repeatedly pressing a 'save data' button as they trace the high tide line.

Tidewatch Maps, developed by the Virginia Institute of Marine Science (VIMS), is an effective example of an operational street-level inundation model. Driven by the open source SCHISM hydrodynamic model, Tidewatch operationally disseminates 36-hour inundation forecast maps with a 12-hour update frequency. SCHISM’s storm tide forecasts provide an interactive forecast mapping tool hosted via ArcGIS Online with hourly temporal resolution and a 5 m spatial resolution. This model is validated using community science data collected by volunteers of Catch the King, the Guinness-Certified World's Largest Environmental Survey.