Banded choropleth map

Because of the disability in visualizing statistical data with spatiotemporal information of choropleth map, we propose a novel method banded choropleth map (BCM). This technique makes use of space filling, splits sub-regions with equal width or area, and then fills partitions with different colors. It can utilize limited screen space more sufficiently than small multiples. It can also preserve context more clearly than animation. Based on the technique, we made a formal evaluation to find the efficiency of BCM in doing global task and local task under different factors.