remote sensing
What is Remote Sensing?
Remote sensing, in simplest words, means acquiring information about an object without touching the object itself.
Conventionally, however remote sensing has come to imply that the sensor and the target are located remotely apart and the electromagnetic radiation serves as a link between the sensor and the object, the sun being the major source of energy illuminating the earth. The part of this energy is reflected, absorbed and transmitted by the surface. A sensor records the reflected energy.
Remote Sensing is performed using an instrument, often referred to as a sensor. Most of the remote sensing instruments record electromagnetic radiation (EMR) that travels at a velocity of 3x10^8 m/s from the source, directly through the vacuum of space or indirectly by reflection or reradiation to the sensor. The EMR represents an extremely efficient high-speed communication link between the sensor and the remotely located objects.
A remote sensing sensor detects changes in the amount and the properties of EMR which become valuable source for interpreting various phenomena, objects etc.
Remote sensing can then be defined as-
The technique of acquiring information about an object by a recording device (sensor) that is not in physical contact with the object by measuring portion of reflected or emitted electromagnetic radiation from the earth’s surface.
Remote sensing is defined as the technique of obtaining information about objects through the analysis of data collected by special instruments that are not in physical contact with the objects of investigation. As such, remote sensing can be regarded as "reconnaissance from a distance," "teledetection," or a form of the common adage "look but don't touch." Remote sensing thus differs from in situ sensing, where the instruments are immersed in, or physically touch, the objects of measurement. A common examples of an in situ instrument is the soil thermometer.
Traditionally, the
Remote sensing, in simplest words, means acquiring information about an object without touching the object itself.
Conventionally, however remote sensing has come to imply that the sensor and the target are located remotely apart and the electromagnetic radiation serves as a link between the sensor and the object, the sun being the major source of energy illuminating the earth. The part of this energy is reflected, absorbed and transmitted by the surface. A sensor records the reflected energy.
Remote Sensing is performed using an instrument, often referred to as a sensor. Most of the remote sensing instruments record electromagnetic radiation (EMR) that travels at a velocity of 3x10^8 m/s from the source, directly through the vacuum of space or indirectly by reflection or reradiation to the sensor. The EMR represents an extremely efficient high-speed communication link between the sensor and the remotely located objects.
A remote sensing sensor detects changes in the amount and the properties of EMR which become valuable source for interpreting various phenomena, objects etc.
Remote sensing can then be defined as-
The technique of acquiring information about an object by a recording device (sensor) that is not in physical contact with the object by measuring portion of reflected or emitted electromagnetic radiation from the earth’s surface.
Remote sensing is defined as the technique of obtaining information about objects through the analysis of data collected by special instruments that are not in physical contact with the objects of investigation. As such, remote sensing can be regarded as "reconnaissance from a distance," "teledetection," or a form of the common adage "look but don't touch." Remote sensing thus differs from in situ sensing, where the instruments are immersed in, or physically touch, the objects of measurement. A common examples of an in situ instrument is the soil thermometer.
Traditionally, the