What is a remote sensing?
Remote shooting is a science of getting information about something, such as an object or process without direct physical contact, in general because such contact is impossible or very expensive to obtain. Information obtained using long -distance sensory techniques can simply include observations, such as a picture taken from an aerial camera, or may include multiple nuanced measurements such as Sonar, which is used to collect data for and size. In many different fields, long -distance sensory techniques are used, including biology, chemistry and physics. In most cases, however, "remote sensing" concerns techniques used to collect images and data on objects on Earth from a distance; An example is satellite mapping of the country.
Some forms of remote survey, such as photography, are passive because they simply collect information that already exist. For example, the camera does not release anything; Instead, it produces images based on reflected lights present in the environment. On the other side of anotherThe forms of remote survey use active techniques to collect information. For example, active Sonar systems work by emitting sound rupture and remotely collecting remote objects. This is an active method because sound impulses must be emitted before any form can be collected.
The remote sensing applications are numerous because there are many objects and phenomena that are difficult to obtain information about. For example, the radar is used to remotely monitor the weather conditions; to measure the speed of drivers; And to oversee air traffic, especially airports. In addition, air photography methods are used for the development of air maps. Some techniques in aerial photography can even be used to make topographic maps that provide detailed information about the terrain and height. Further formulas of remote survey are used to measure earthquake, the extent of weapons, measurement of atmospheric chemical concentrations and measurement of emitted radiation.
Most of the data obtained by remote survey methods are analyzed through computers, as computers can analyze information more efficiently and more precisely than people can. For example, computer algorithms are often used to distinguish valuable data from the noise of instrumentation. Computers can be used to clean images and for quick calculations about the data obtained. Computer programs can even be used to exactly scal images. This is particularly important when long -distance survey methods are used to develop images of very large objects or areas, as with air photography.