I am fairly new to JSON and I want to create a choropleth example as so. <http://gabrielflor.it/a-half-decade-of-rising-poverty> Whenever the years are clicked it just goes to a different portion of the JSON (I'm assuming). Is this how functionality like this is usually done to avoid redrawing the whole map again and calling another JSON.js file? If so these .JSON files can get quite large?