Radar Remote Sensing By Falah Fakhri Post-doctoral Scholar falah Radar Remote Sensing By Falah Fakhri Post-doctoral Scholar falah.fakhri@utu.fi https://www.researchgate.net/profile/Falah_Fakhri https://falahfakhri.wordpress.com https://twitter.com/FALAHFAKHRI ‎ Department of Geography and Geology Tuesday 26/08/2014 Time: 14:00 – 15:00 MAANTIETEEN JA GEOLOGIAN LAITOS

• Passive and active Remote Sensing • Concept of Radar Seminar’s outline • Passive and active Remote Sensing • Concept of Radar • Concept of SAR • Optical Image Format and Characteristics • SAR Image Format and Characteristics Amplitude Phase • Images acquisitions • Software's are used in SAR (Radar Images Processing) MAANTIETEEN JA GEOLOGIAN LAITOS

Passive and active Remote Sensing 1/1 Passive vs. Active Sensors MAANTIETEEN LAITOS

where objects are in space. Concept of Radar (1/10) Echolocation is the use of sound waves and echoes to determine where objects are in space. Bats use echolocation to navigate and find food in the dark. To echolocate, bats send out sound waves from their mouth or nose. When the sound waves hit an object they produce echoes. The echo bounces off the object and returns to the bats ears. Bats listen to the echoes to figure out where the object is, how big it is, and its shape. MAANTIETEEN LAITOS

Concept of Radar (2/10) Imagine you are in the Grand Valley and you shout. The cliffs will reflect the sound wave. After some time you will hear an echo, which is not exactly the same compared to what you shouted. This is the “principle” of a radar! MAANTIETEEN JA GEOLOGIAN LAITOS

RADAR stands for Radio Detection and Ranging … so what is a Radar? Concept of Radar (3/10) RADAR stands for Radio Detection and Ranging … so what is a Radar? A: (Imaging) Radar is an active system that uses a transmitter to illuminate a scene. The pulses sent are microwaves, i.e. a wave with an amplitude and a phase, having a certain frequency and polarization. The radar then records the echo or (backscatters) scattered back from the objects/targets B: Non imaging MAANTIETEEN JA GEOLOGIAN LAITOS

Concept of Radar (4/10) MAANTIETEEN JA GEOLOGIAN LAITOS

radars illuminate the target so that they • can operate day and night. Concept of Radar (5/10) radars illuminate the target so that they • can operate day and night. • Microwave frequencies Electromagnetic waves penetrate to Some extent through media. • At most frequencies clouds are transparent! • Complex interaction with medium or target: a “Radar image” is not a photo! MAANTIETEEN JA GEOLOGIAN LAITOS

Concept of Radar (6/10) Passive Remote sensing Active Remote Sensing MAANTIETEEN LAITOS

Concept of Radar (7/10) interaction with medium or targets The transmitted pulse interacts with the Earth surface and only a portion of it is backscattered to the receiving antenna MAANTIETEEN LAITOS

Interesting, right? This is just a sneak preview of the full presentation. We hope you like it! To see the rest of it, just click here to view it in full on PowerShow.com. Then, if you’d like, you can also log in to PowerShow.com to download the entire presentation for free.