Open Fantasy Map uses the technology stack of Open History Map to store data about fantasy worlds for role players to live their adventures in the best ways possible. The platform displays fantasy maps created via generative algorythms as well as digitized maps by artists. This also enables, thanks to the OHM technologies, to "fork" the world and have the players impacting and changing their world.

In the last years Open History Map presented at FOSS4G single specific tools created to display the world of the past. These tools are now integral parts of the OHM platform that is now finally visible and usable. With this presentation we want to share the architecture of the openhistorymap platform and all of the open source tools connected to it, the challenges we faced in the deployment, the techs we had do deploy to manage almost 2TB of vector data and 6TB of images in order to display the changes in the world of the past.

Open History Map aims to display the changes that happened in the past both from a political as well as a social and topographical point of view. the storage of these multi-dimensional changes has an enormous impact on the way the map is visualized. For this reason we needed to develop a caching system that was on one side flexible enough to display a non-quantizable dimension (time) and give us the possibility to pre-cache the whole system into a distributable package for easy local usage and possibly fast update of the package. The caching system itself is backend independent and defines a process to simplify access to a mix of discreet (x,y,z) and continuous (t) identifiers for independently variating geospatial datasets.