India's general elections are coming up, and many data folks are looking forward to analyze and map results spatially (assuming, as I also argued last time, that all politics are local). Until very recently, only few could do this, however, because the basic prerequisite - GIS shapefiles of India's post-delimitation constituencies and polling station localities - were only available commercially (and could easily cost several thousand US dollars). Today, I wish to present a set of draft shapefiles comprising current polling booth localities, assembly constituencies and parliamentary constituencies under an open license, shared in the hope that they enable more visualizations and better spatial analyses of the ongoing elections.
Unlike the only other set of openly licensed shapefiles I am aware of - the handcrafted parliamentary constituency shapefiles recently published by DataMeet after their Bangalore hackathon (which does not yet contain assembly constituencies or polling station localities) - I chose an automated, algorithm-driven approach, working off draft polling station locality data published online by the Election Commission. I processed this data in multiple steps to derive assembly and later parliamentary constituency shapefiles: