Understanding the mobility of geo-coded entities in geospatial data is important to many fields, ranging from the social sciences to epidemiology, economics, or air traffic control. Such entities remain challenging to visualize. Visualizing such entities can be challenging as it requires preserving both their explicit relationship properties (spatial trajectories) and their implicit properties (abstract attributes of those trajectories). Using the spatial nesting technique, an existing technique called Origin-Destinations maps preserves both explicit and implicit relationship properties of datasets. This work aims to generalize this technique beyond the origins and destinations dataset (2-attribute datasets) to explore multi-dimensional datasets (N-attribute datasets) with the nesting approach. We present an abstraction framework—we call GRIDIFY—and an interactive open-source tool implementing this framework using several levels of nested maps.

This interactive tool is used to categorize quantitative values into categories based on the fuzzy logic theory. FuzzyCut can derive several new attributes from the original dataset. For instance, age could be split into different categories, such as Children, Adult and Old. There are sliders and black points being adjusted to change the shape of the membership function. The new attribute Categories and Membership Degree are generated by adjusting those sliders.

GroupSet is an interactive and web-based technique to facilitate the exploration of temporal charts. In particular, GroupSet relies on partial sets membership visualization to help users explore how quantitative values change over time. As shown in the following figure, we implemented a soccer team ranking data in GroupSet (as shown in Fig. 1). In ①, teams are categorized by rank into 4 sets (Top 5, Top 10, Bottom 10, and Bottom 5). Users can then explore the teams based on their memberships to those sets over a season and identify temporal patterns by manipulating a combination matrix of set intersections ②. The final view provided by GROUPSET is a filtered line chart corresponding to each set’s intersection showing teams with similar patterns ③ along with other attributes (e. g., change).