A first version of a tiled base
map of the Roman Empire was created in 2012 by the author, in collaboration with the Pelagios project. A second version was created afterwards and became part of an online historical geographic information system (GIS) called the Digital Atlas of the Roman Empire (DARE) hosted by the Department of Archaeology and Classical History, Lund University, Sweden and available at http://dare.ht.lu.se. The
map was inspired by the Barrington Atlas of the Greek and Roman World (Talbert, 2000) and was built upon digitization efforts carried out by the Pleiades and DARMC projects even though it became necessary to return to the original
map for additional data in order to produce a functional digital
map. DARE aims at a much higher level of accuracy and the integration of digital resources such as satellite imagery, national topographic
maps, source texts, other source material and scholarly literature. Since 2012 we have worked to improve the
map regarding both its appearance, quality of location, meta data describing properties of the ancient place and links to related digital resources.
The most prominent change is however the addition of 9111 places (and buildings) with a different provenance than the Barrington Atlas of the Greek and Roman World. The Barrington Atlas was limited to the physical size of the printed atlas, limitations that do not apply the same way to a digital
map. Most places that have been added appear in national heritage databases which increasingly have become available online the last years, for instance, the UK based heritage databases Pastscape, Canmore and Coflein covering England, Scotland and Wales respectively. Another important change in the new version of the
map is the rendering of natural and semi natural areas (forest, grassland etc.) and bathymetry. In comparison with the
map created for the Pleiades project, the
map created at Lund University contains an additional zoom level, i. e. zoom level 11. The Digital Atlas and its place database is an active project which is updated at least once a month. In 2015, 822 places were added.
The
map itself is also used by Pelagios, Pleiades and other projects to provide a more suitable historical context for their
mapping applications. Its gazetteer is implemented in the Pelagios project. The base
map is Open Data and can be used by anyone under a Creative Commons BY-SA licence. The projection of the
map is Spherical Mercator (EPSG:3857) compatible with most Web
mapping software and easy to implement. The maximum zoom level 11 corresponds to a scale at 1:250 000.
In DARE, ancient sites are organized as places and buildings (subsites), each with a distinct place type and location. The buildings are not rendered on the base
map because of their close proximity to the places they belong to, but are instead available as thematic overlays (e.g. amphitheaters, theaters, temples etc. respectively). Meta data about places and buildings are available next to the
map.
map