General introduction to remote sensing

A brief introduction about remote sensing

1. Introduction to remote sensing Shruthi C.G Assistant professor Ait , chikmagalur

2. Contents INTRODUCTION TYPES OF REMOTE SENSING COMPONENTS OF REMOTE SENSING ADVANTAGES AND DISADVANTAGES CONCLUSION REFERENCE

3. Introduction It is the acquisition of information about an object or phenomenon without making physical contact with the object. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on earth by means of propagated signals. Remote sensors measure electromagnetic (EM) radiation that has interacted with the Earth’s surface. Interactions with matter can change the direction, intensity, wavelength content, and polarization of EM radiation.

4. Types of remote sensing(on the basis of energy) There are two ty pes of remote sensing Active remote sensing: Contrary to ‘Passive Remote Sensing’ the Remote Sensing performed with the help of artificial energy sources like electric bulbs tube lights, etc. is called  Active Remote Sensing Passive remote sensing . The remote sensing done through naturally available energy sources like the sun is called Passive Remote Sensing

5. Types (on the basis of electromagnetic radiation) Optical remote sensing It is the remote sensing done in visible, near infra-red and middle infra-red ranging between the wavelengths from 0.3 um to 3 um.  Thermal remote sensing Remote sensing of the emitted radiation in the range of 3 um to 5.5 um and 8 to 14 um. Microwave remote sensing Remote sensing of higher wavelengths ranging between 1 mm to 1 m. These higher wavelengths can penetrate clouds

6. Compo nents of remote sensing Light source Radiation and the atmosphere Target Recording of energy by the sensor Processing Analysis

7. Advantages of remote sensing It can collect data from large geographical areas in a short timed It can provide real time or near real time data It can access dangerous or inaccessible areas It can provide m ulti angle and multi spectral imaging It can monitor environmental change

8. Disadvantages of remote sensing Remote sensing is a fairly expensive method of analysis especially when measuring or analyzing smaller areas. Remote sensing requires a special kind of training to analyze the images. It is therefore expensive in the long run to use remote sensing technology since extra training must be accorded to the users of the technology. It is expensive to analyze repetitive photographs if there is need to analyze different aspects of the photography features.

9. Conclusion Remote sensing technology reduce costs It reduce environmental impacts Early identification of crop health and stress Air craft and satellites are the main platforms used in remote sensing

10. REFERENCE Giglio L, Loboda T, Roy DP, Quayle B, Justice CO. An active-fire based burned area mapping algorithm for the MODIS sensor. RSE. 2009;113(2):408–20 Flannigan MD, Vonder Haar TH. Forest fire monitoring using NOAA satellite AVHRR. Can J For Res. 1986;16:975–82. Green, E.P.; Ellis, A.C. The assessment of mangrove areas using high resolution multispectral airborne imagery. J. Coast. Res. 1998, 14, 433–443 Murray, J. F., Atlas of the Spectrum of a Platinum/Chromium/Neon Hollow-Cathode Reference Lamp in the Region 240—790 nm. Report to ESA, John Wheaton Associates, London, 1994 Sofan P, Bruce D, Jones E, Marsden J. Detection and validation of tropical peatland flaming and smouldering using Landsat-8 SWIR and TIRS Bands. Remote Sens. 2019;11(4):465 Albini FA. Estimating wildfire behavior and effects. Gen. Tech. Rep. INT-GTR-30. Ogden: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 92 p; 1976. 23

11. THANK YOU