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PART II
Sensors and Systems for Urban Areas

Part II (Chapters 2–7) discusses several advanced and emerging platforms or systems, such as unmanned aircraft systems (UAS) and social sensing, which offer new opportunities advancing urban studies. It begins with Chapter 2 discussing an effort to examine urban built‐up volume through three‐dimensional analyses with lidar and radar data. The authors used spaceborne radar data to monitor built‐up volume that was further validated with lidar data. Chapter 3 discusses the opportunities and challenges of UAS for urban studies. UAS platforms represent a new frontiers of remote sensing applications. The remaining chapters (Chapters 4–7) in Part II focus on big geotagged‐data from mobile phones, social media, vehicle trajectories, and street views, which provide new opportunities for understanding human behaviors and characteristics of cities. Chapter 4 reviews various analytical methods, such as temporal signature analysis, text analysis, and image analysis, for social sensing research. Chapter 5 reviews the utilities of ground‐based street view images for urban remote sensing research. Chapter 6 discusses the usefulness of social media outlets such as Twitter for geographic research on human activities in urban areas. Finally, Chapter 7 discusses the potential of integrating remote sensor data with location‐based social media data to examine socioeconomic dynamics.