Open Data Ideathon/Hackathon for Ikebukuro & Yokosuka City to Be Held 2015-03-03 Ikebukuro Event by minegishi Open Data Ideathon/Hackathon for Ikebukuro & Yokosuka City to Be Held 2015-03-03 Ikebukuro Event by minegishi Utilizing the memorial battleship Mikasa, 3D map of Ikebukuro station, walking-space network data, and open da…