This example visualizes building and gate locations on an interactive map of Mumbai, using Leaflet to render the base tiles and D3.js to fetch geospatial data from GeoServer via Web Feature Service (WFS). It displays building population and waste generation metrics as interactive circle markers with popups, and color-codes buildings based on their association with specific gates. The map also supports dynamic re-rendering to highlight buildings linked to selected gates, using custom Leaflet icons and D3-based GeoJSON processing for data manipulation.