Scope: Entire Country
This is a bivariate choropleth map of internal migration in Sri Lanka, based on 9 months of call detail records (CDRs) from 2013. Inward and outward migrations are represented by pink and green univariate color scales respectively. Both color scales have been rendered on the same map and the blended color —purple—represents both inward and outward migrations.
Click or tap on a map-segment to change the scope, which then recolors the map to show the inward and outward migrations with respect to that map-segment. Double-click or double-tap anywhere on the map to reset the scope to the entire country. The color saturation levels are based on quantiles, and will therefore change based on the selected scope.