Conducted between 1656-1658, "the Down Survey of Ireland is the first ever detailed land survey on a national scale anywhere in the world". The Down Survey of Ireland project digitizes the surviving maps of this survey and renders them as an online public resource. The Down Survey of Ireland digital project is comprised of two main components: the digital images of all the surviving Down Survey maps with written descriptions and the Historical GIS. The project interface facilitates user browsing of the maps by country, barony, and parish - information that was all encoded under the map images. Each image is manipulable: employing zooming, panning, and toggle functions. The Historical GIS function enables searching by landowner, religion, and murders.