The acquisition of information regarding a phenomenon or an object without establishing physical contact is called remote sensing. It allows the collection of data from inaccessible and unsafe areas. Some of the fields, which make use of remote sensing are hydrology, ecology, geology and meteorology. It is broadly divided into two categories - active and passive. Active remote sensing involves the emission of a signal by a satellite or aircraft and then detecting its reflection by an object. Passive remote sensing detects reflection of electromagnetic radiation from other sources such as sunlight. The data which is obtained through remote sensing is analyzed and processed using computer software. This book provides comprehensive insights into the field of remote sensing along with its concepts and applications. It is appropriate for students seeking detailed information in this area as well as for experts. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.