Coastal Aquaculture and Mariculture

Unit 8- Deep sea fisheries

8.3.1. remote sensing in fisheries
Remote sensing is the science of acquiring information about the earth's surface without actually being in contact with it. It is also defined as the science and technology by which the characteristic of objects of interest could be identified, measured or analyzed without direct contact. The remote nature of these technoilogies allow us to make observations, take measurements, and produce images of phenomena that are beyond the limits of our own senses and capabilitie. Remote sensIng technology makes use of the wIde range Electro-Magnetic Spectrum (EMS) ranging from Gamma ray, X-ray, Ultraviolet (UV), Visible light, Infrared (IR) to Radio Wave, in order from the shorter wave lengths.
Components of remote sensing system
There are four basic components in a remote .sensing system like
1. Target: It is the object or material that is being studied.
2. Energy source: It is the one which illuminates or provides electromagnetic energy to the target.
3. Transmission path: The energy interacts with the target, depending on the properties of the target and the radiation, and will act as a medium for transmitting information from the target to the sensor.
4. Sensor: It is a remote device that collects and records the electromagnetic radiation. It can be used to measure energy that is given off / emitted by the target, reflected off the target, or transmitted through the target. Thus, a sensor can be designed to detect energy in specific wave lengths to provide information about the surface type being scanned. The sensors can be fixed on different platforms (Vehicle to carry the sensor) like
Ground platforms -Tower, scaffolding, building etc.,
Aerial platforms -Ballons, rockets, helicopters etc.,
Satellite platforms -Satellites like geostationary satellites, polar orbiting satellites and higly elliptical orbits satellites.
The following sensor platforms are used to measure the oceanographic parameters.