This interactive map shows where people of specific surnames lived in Ireland in the 19th century, according to parish records.
I scraped a static dataset from the Irish Times website, which was served up as a static image.
I wanted a much more interesting way to view the same information, so I built one with additional insight provided by clustering of semi-opaque colored markers.
The static dataset from the Irish Times has 4 pieces of information: latitude, longitude, name of parish and number of family surnames in that parish.
Built with PHP, Leaflet & JavaScript.