Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance typically from satellite or aircraft. Remote sensing data is one of the primary data sources in gis analysis. There are three main types of active remote sensing. Examples of remote sensing systems of the active type are. The technology of modern remote sensing has a very long history, dating back to the end of the 19th. Fundamentals of remote sensing and its applications in gis. Remote sensing imagery remote sensing imagery american. There are three 3 types of scattering which take place.
Radiometric color depth spatial resolution describes how much detail in a photographic image is visible to the human eye. Digital image classification has histori cally been limited to separating classes based on spectral response differences among different types of land cover or land. Laser altimeters on satellites measure factors like wind speed and. One of the most important uses is for air traffic control and. This type of remote sensing emits radiation in the visible range which hits the target and the back scattered light is analyzed. Lidar is a common active optical remote sensor that is used. Principles of remote sensing is written to be primarily used as textbook for the in troductory module. Radar imaging can be used for important safetyrelated remote sensing tasks. The information is acquired through electromagnetic radiation, force fields or acoustic energy using different types of remote sensors that can. Different types of remote sensing active and passive. There are two types of remote sensing technology, active and passive remote sensing. In remote sensing various kinds of tools and devices are used to make. Detection and tracking algorithms, target detection, hyperspectral target detection, sensors, algorithm development, point spread functions, stochastic. Digital image processing techniques pull information from imagery that may not be seen with the naked eye.
Understanding these fundamental aspects of remote sensing will. Active sensors emit energy in order to scan objects and areas whereupon a sensor then detects and measures the radiation that is reflected or backscattered from the target. Manual interpretation and analysis dates back to the early beginnings of remote sensing. The choices involved in the selection of a remote sensing data type are increasingly.
Only selected portions of the electromagnetic spectrum which can pass through the earths atmosphere with relatively little attenuation are used for remote sensing purpose. Do you know there are two types of remote sensing technology, active and passive remote sensing. Special cameras collect remotely sensed images, which help researchers sense things about the earth. The selected region of the electromagnetic spectrum which are employed in remote sensing include. Other more specific classes, such as different rock types, may not be easily distinguishable using these broad wavelength ranges. Pdf introduction to remote sensing systems, data, and.