When working with geographic information, its geometrical representation within the space is not the only important thing. Day by day time is becoming a new and important dimension to take into account.
This way, visualizations must show how data changes over time: city population, country frontiers, roads built, and so on.
There are many solutions to animate the data evolution through time but, as always, we work with web technologies, there are two groups: the solutions based on the server side and those based on the client side.
For server-side solutions, we can find the
TIME parameter in the WMS and WFS standards. It allows us to request for raster or vector data in a specific time or within a range.