This book covers the fundamentals and the latest research concerning monitoring urban dynamics through detecting small-scale events from geosocial media. It begins by describing the key issues of detecting small-scale events, and explores the opportunities and challenges of adopting geosocial media for such research. Referring to the patterns reflected on social media platforms, the book classifies the small-scale events into two types. i.e., type I events with abrupt patterns and type II events with random occurrence of key factors, where social events and traffic events are representative...