  This paper surveys visualization and interaction techniques for geospatial
networks from a total of 95 papers. Geospatial networks are graphs where nodes
and links can be associated with geographic locations. Examples can include
social networks, trade and migration, as well as traffic and transport
networks. Visualizing geospatial networks poses numerous challenges around the
integration of both network and geographical information as well as additional
information such as node and link attributes, time, and uncertainty. Our
overview analyzes existing techniques along four dimensions: i) the
representation of geographical information, ii) the representation of network
information, iii) the visual integration of both, and iv) the use of
interaction. These four dimensions allow us to discuss techniques with respect
to the trade-offs they make between showing information across all these
dimensions and how they solve the problem of showing as much information as
necessary while maintaining readability of the visualization.
https://geonetworks.github.io.
