Remote Sensing - by Ashwini


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Remote Sensing - by Ashwini

  1. 1. REMOTE SENSING<br />
  2. 2. <ul><li>Remote sensing is the small- or large-scale acquisition of information of an object or phenomenon, by the use of either recording or real-time sensing device(s) that are wireless, or not in physical or intimate contact with the object (such as by way of aircraft, spacecraft, satellite)
  3. 3. In practice, remote sensing is the stand-off collection through the use of a variety of devices for gathering information on a given object or area. </li></li></ul><li>Picture captured by remote sensing technique<br />
  4. 4. <ul><li>There are two main types of remote sensing: passive remote sensing and active remote sensing.
  5. 5. Passive sensors detect natural radiation that is emitted or reflected by the object or surrounding area being observed.
  6. 6. Reflected sunlight is the most common source of radiation measured by passive sensors.
  7. 7. Examples of passive remote sensors include film photography, infrared, charge-coupled devices, and radiometers. </li></li></ul><li>Continued.<br /><ul><li>Active collection, on the other hand, emits energy in order to scan objects and areas whereupon a sensor then detects and measures the radiation that is reflected or backscattered from the target.
  8. 8. RADAR is an example of active remote sensing where the time delay between emission and return is measured, establishing the location, height, speed and direction of an object.</li></li></ul><li>Revolution…<br />The simplest form of remote sensing uses photographic cameras to record information from visible or near infrared wavelengths .<br /> In the late 1800s, cameras were positioned above the Earth's surface in balloons or kites to take oblique aerial photographs of the landscape.<br />Then these photographs were taken from airplanes.<br />In the 1960s, a revolution in remote sensing technology began with the deployment of space satellites.<br />
  9. 9. Continued..<br />From their high vantage-point, satellites have a greatly extended view of the Earth's surface.<br /> The first meteorological satellite, TIROS-1 was launched by the United States using an Atlas rocket on April 1, 1960. <br />This early weather satellite used vidicon cameras to scan wide areas of the Earth's surface. <br />Once captured, this data is then transmitted electronically to receiving stations found on the Earth's surface<br />
  10. 10. advantages<br />Remote sensing makes it possible to collect data on dangerous or inaccessible areas and<br />Remote sensing also replaces costly and slow data collection on the ground, ensuring in the process that areas or objects are not disturbed.<br />Other uses include different areas of the earth sciences such as natural resource management, agricultural fields such as land usage and conservation. <br />
  11. 11. continued.<br />Radiometers and photometers are the most common instrument in use, collecting reflected and emitted radiation (radio active mineral)<br />Stereographic pairs of aerial photographs have often been used to make topographic maps by imagery ( toposheet).<br />Earth scientists use the technique of remote sensing to measure phenomena found in the Earth's lithosphere, biosphere, hydrosphere, and atmospher<br />
  12. 12. continued<br /> Advanced sensors aboard the GOES satellite produce a continuous data stream so images can be viewed at any instance. <br />The imaging sensor produces visible and infrared images of the Earth's terrestrial surface and oceans (Figure 5).<br /> Infrared images can depict weather conditions even during the night. <br />Another sensor aboard the satellite can determine vertical temperature profiles, vertical moisture profiles, total precipitable water, and atmospheric stability. <br />
  13. 13. Figure 3: TIROS-1 satellite. (Source: NASA - Remote Sensing Tutorial) <br />
  14. 14. Color image from GOES-8 of Hurricanes Madeline (Source: NASA - Looking at Earth From Space) <br />
  15. 15. The image below is from TIROS-7 of a mid-latitude cyclone off the coast of New Zealand.<br />(Source: NASA - Looking at Earth From Space) <br />(Source: NASA - Looking at Earth From Space) <br />(Source: NASA - Looking at Earth From Space) <br />(Source: NASA - Looking at Earth From Space) <br />
  16. 16. Bathurst Island in Nunavut, Canada. <br />false-color image of the southern portion of Manhatten Island <br />Yankee stadium in Brooklyn<br />
  17. 17. THANK YOU<br />