Lecture 01.pdf
- 1. Lecture-1 Fundamentals of Remote Sensing Professor Dr. Mohd. Shamsul Alam Dept. of Geography and Environment Jahangirnagar University, Savar, Dhaka-1342
- 2. What is Remote Sensing? Remote Sensing is the collection of information relating to objects without being in physical contact with them. Thus our eyes and ears are remote sensors, and the same is true for cameras and microphones and for many instruments used for all kinds of applications
- 3. According to Canada Centre for Remote Sensing (CCRS): "Remote sensing is the science of acquiring information about the Earth's surface without actually being in contact with it. This is done by sensing and recording reflected or emitted energy and processing, analyzing, and applying that information." What is Remote Sensing?
- 4. Different components of the photograph appear different colors. i. Hair…………………….………..Black ii. Face…………………….…….…...Fair iii. T-Shirt……………………….....Purple iv. Pant……………stripe _ blue and white v. Shoe……………………………....Pink vi. Hair band………………..……......Pink 2. Tree…………………………Light Green 3. Grass………………………. Deep Green Component…………….…….…….Color 1. Person
- 5. Spatial relationships between components of a scene may also be determined from a photograph. 1. Height difference between objects. 2. Areal extent of the objects. 3. Relative position, arrangement of objects may be revealed.
- 6. Significances of Remote Sensing 1. Large area coverage: Remote sensing allows coverage of very large areas which enables regional surveys on a variety of themes and identification of extremely large features. 2. Remote sensing allows repetitive coverage which comes in handy when collecting data on dynamic themes such as water, agricultural fields and so on. 3. Remote sensing allows for easy collection of data over a variety of scales and resolutions. 4. A single image captured through remote sensing can be analyzed and interpreted for use in various applications and purposes.
- 7. Significances of Remote Sensing 5. Remotely sensed data can easily be processed and analyzed fast using a computer and the data utilized for various purposes. 6. Data collected through remote sensing is analyzed at the laboratory which minimizes the work that needs to be done on the field. 7. Remote sensing allows for map revision at a small to medium scale which makes it a bit cheaper and faster. 8. Remote sensing is a relatively cheap and constructive method reconstructing a base map in the absence of detailed land survey methods.
- 8. First photograph in the world by Niepce 1827 - Niepce takes first picture of nature from a window view of the French countryside using a camera obscura and an emulsion using bitumen of Judea, a resinous substance, and oil of lavender (it took 8 hours in bright sunlight to produce the image)
- 9. 1860's - Aerial observations, and possible photography, for military purposes were acquired from balloons in the Civil War. Balloons were used to map forest in 1862, but not used to acquire aerial photographs as far as scholars can tell
- 10. • 1903 - The Bavarian Pigeon Corps uses pigeons to transmit messages and take aerial photos.
- 11. • 1914 - WWI provided a boost in the use of aerial photography, but after the war, enthusiasm waned • 1960 - TIROS-1 launched as first meteorological satellite. • 1960's - US begins collection of intelligence photography from Earth orbiting satellites, CORONA.
- 12. • 1972 - Launch of ERTS-1 (the first Earth Resources Technology Satellite ,later renamed Landsat 1). • 1975 - Landsat 2, GOES • 1977 - Meteosat-1 the first in a long series of European weather satellites • 1978 - Landsat 3 • 1981 - Space-Shuttle Imaging Radar (SIR-A), Meteosat-2 • 1982 - Landsat-4 • 1984 - SIR-B • 1984 - Landsat-5
- 13. • 1986 - Launch of SPOT-1 • 1990 - SPOT-2 • 1991 - ERS (European Radar Satellite), IRS-1B, Meteosat-5. • 1992 - JERS-1,Topex/Poseidon. • 1993 - SPOT-3, Landsat-6 fails to achieve orbit, Meteosat-6 • 1994 - SIR-C/X-SAR flys on the space shuttle. • 1998 - Launch of SPOT-4, SPIN-2, JERS-1 • 1999 - Launch of Landsat 7, IKONOS, MODIS • 2000 - SRTM (China), • 2001- Quickbird • 2002 - Aqua, SPOT-5,