Supplementary Videos S1 and S2 – GPS-based AR Visualization of SWAT+ Hydrological for HRU and Channel Outputs

Supplementary Video S1. Demonstration of the GPS-based mobile AR application visualizing daily SWAT+ HRU variables (soil water, water yield, percolation, evapotranspiration, and precipitation) across multiple field sites, including an agricultural field, a paddy field, and a park. Values updating dynamically as the date slider is adjusted to illustrate temporal change.

Supplementary Video S2. Demonstration of the GPS-based mobile AR application visualizing daily channel outputs (channel outflow, sediments, outflow and nutrient concentrations such as nitrogen and phosphorus). Example interaction at channel 35, 83, and 17 shows values updating with the date slider, highlighting temporal dynamics. Water-quality variables (sediment and nutrients) are derived from SWAT+ simulations but were not calibrated or validated and are presented for visualization purposes only.