Remote Sensing Technology
The meaning of remote sensing technology is satellite-based remote sensing technology which is being used for the collection and adjustment of data related to weather, atmosphere, agriculture and land. Today, remote sensing problems have proved to be very beneficial in coordinating the works of land mapping, drought and flood monitoring, environmental change and its effects etc.
The first remote sensing satellite for earth observation was launched by India on 1 June 1975.Rohini was launched exactly 2 months later on 10 August 1975. This was the initial phase of India in the field of tele-sensing.In this period remote sensing satellites named RS-1,RSD-1, and Bhaskar-2 were launched. The above type of remote sensing satellite by India RS-1A was launched on 19 March 1988.
Images obtained from remote sensing satellites are enlarged and analyzed with the help of computers. The use of computers is essential for analyzing any information received from satellites. Since all these data are received by telemetry from the satellite and stored in magnetic tapes, digital processing of these images is done by computer to get all the information. For example, to know about a particular vegetation located in the sea, first, the reflectivity of that vegetation and its quantity are determined in the laboratory. After matching the data obtained in the laboratory with the data of the pictures obtained by the satellite, the actual situation is obtained. Similarly, by ascertaining the reflectivity of snow of different thicknesses in the laboratory, the thickness of the snow located at the concerned place is obtained by matching the pictures and data obtained from the satellite.
Tele-sensing systems:
Tele-sensing systems can be divided into two parts based on functionality – active tele-sensing and passive tele-sensing. In active tele-sensing, the equipment installed in the satellite not only sends a special type of wave to the specific object but also receives that wave when it returns. The conclusion is obtained based on the time taken for this process, the intensity of radiation etc. Its conclusion is that in remote sensing, the equipment does not transmit the wave but receives the incoming elements. The difference between passive and active remote sensing is the same as between ordinary photography and flash photography.
Remote sensing technology:
Remote sensing technology is being used in the collection and adjustment of data related to weather, atmosphere, agriculture and land. India has established the National Natural Resource Management System (N.N.R.M.S.) under the Department of Space. It is an integrated resource system, the purpose of which is to assess the availability of natural resources in the country correctly by using the data obtained by remote sensing systems in traditional techniques, listing them and giving suggestions related to the use of natural resources.
