Nowadays, pervasive technologies are characterized by their ability to process data related to moving objects. This has resulted in a new data source type called Trajectory Data (TD) which is generated from data captured through moving objects’ activities. This book covers TD and the Trajectory Data Warehouse (TDW) repository used to gather such data. The book proposes a new profile for modeling TD, describes maintenance of the TDW under different schema changes and proposes algorithms to hold the changes.