Foreword: The world’s urban centers have taken on increasing importance and power as economic engines of growth and places to live, with more than half the world’s population now in cities. With this growth expected to continue in the decades ahead, city leaders face numerous challenges as far as infrastructure and service delivery is concerned. One of the most promising solutions to this increasingly complex urban problem is making cities smarter through the use of sensor technology: tiny electronic devices that can measure and track just about anything that …