A map of Boston displays crime incident reports as semi-transparent circles, colored by the Uniform Crime Report (UCR) part via an ordinal color scale. A linked date histogram below the map shows the total number of incidents over time, with a brush that filters the map’s circles by date range. The visualization uses React, D3’s `geoAlbers` projection, `geoPath`, `scaleOrdinal`, and `brushX`. Data comes from Boston Crime Reports and neighborhood GeoJSON files.