ILINet Flu Surveillance Data Interactive Visualization
This interactive visualization explores ILINet flu surveillance data through four linked panels: a line chart showing annual trends, a choropleth map of state-level averages, a bar chart of top states, and a multi-line chart for state comparisons. Built with React and D3 v5, it uses `scaleBand`, `scaleLinear`, and `scaleOrdinal` for chart scaling, `geoAlbersUsa` and `geoPath` for map projection, and `curveCardinal` for line smoothing. Users can hover and click to filter data across panels, with color legends and tooltips providing detailed values.