What is remote sensing and how is it used?
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 from the targeted area. Special cameras collect remotely sensed imagesof the Earth, which help researchers "sense" things about the Earth.
There are two types of remote sensing instruments—passive and active. Passive instruments detect natural energy that is reflected or emitted from the observed scene. Passive instruments sense only radiation emitted by the object being viewed or reflected by the object from a source other than the instrument.
- Remote Sensing Techniques: Remote sensing utilizes satellite and/or airborne based sensors to collect information about a given object or area. Passive sensors (e.g., spectral imagers) detect natural radiation that is emitted or reflected by the object or area being observed.
- Remote sensing means observing something from a distance. Satellites in space observe the Earth from a distance and help scientists study large tracts of land and how that land changes over time. Optical remote sensing satellites use reflected light to detect electromagnetic energy on the Earth's surface.
- Remote sensing instruments are of two primary types—active and passive. The sensor then detects and measures the radiation that is reflected or backscattered from the target. Passive sensors, on the other hand, detect natural energy (radiation) that is emitted or reflected by the object or scene being observed.
A remote sensing application is a software application that processes remote sensing data. Remote sensing applications are similar to graphics software, but they enable generating geographic information from satellite and airborne sensor data.
- COMPONENTS OF A GIS
- Hardware. Hardware is the computer system on which a GIS operates.
- Software. GIS software provides the functions and tools needed to store, analyze, and display geographic information.
- Data. Perhaps the most important component of a GIS is the data.
- A Geographic Information System (GIS Software) is designed to store, retrieve, manage, display, and analyze all types of geographic and spatial data.
- GIS in Mapping: Mapping is a central function of Geographic Information System, which provides a visual interpretation of data. GIS store data in database and then represent it visually in a mapped format. People from different professions use map to communicate.
Remote sensing is the art and science of making measurements of the earth using sensors on airplanes or satellites. These sensors collect data in the form of images and provide specialized capabilities for manipulating, analyzing, and visualizing those images. Remote sensed imagery is integrated within a GIS.
- Remote sensing is the science of obtaining information about objects or areas from a distance, typically from aircraft or satellites. Remote sensors can be either passive or active. Passive sensors respond to external stimuli. They record natural energy that is reflected or emitted from the Earth's surface.
- The term G.I. has been used as an initialism of "Government Issue" or "General Issue", but it originally referred to "galvanized iron", as used by the logistics services of the United States Armed Forces. During World War I, American soldiers sardonically referred to incoming German artillery shells as "G.I. cans".
- A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data.
Updated: 2nd October 2019