This document outlines the population growth of the metropolitan area of Jakarta, known as Jabodatabek, which grew from 6 million in 1976 to 28 million by 2014. It also introduces PetaJakarta.org, a project co-directed by Dr. Tomas Holderness and Dr. Etienne Turpin that aims to crowdsource urban data collection, co-manage civic infrastructure, and promote urban resilience and adaptation in Jakarta.