This visualization shows one week of intense bird migration over the Netherlands and Belgium.

The source data for this visualization were recorded between April 5 and 11, 2013 by 5 weather radars (indicated as gray circles on the map). These data are aggregated over time and altitude, and - because the radars do not sample all airspace of the entire map region - interpolated over a larger area. Streamlines (indicated in blue) follow this interpolated grid and represent the speed and direction of the bird migration at that moment. The grid is updated every second with data from the next 20 minute interval, progressing the animation through time. For more information on the methodology, see Shamoun-Baranes et al. 2016.

The visualization was developed by LifeWatch INBO for ENRAM, the European Network for the Radar Surveillance of Animal Movement. The long-term goal of ENRAM is to retrieve and visualize this kind of data at a European scale. Documentation and source code are available on GitHub.