![October 14,
2020
15
Thus (frequency [f or V] * wavelength[lambda]) is equal to a constant (c)
Relation between the speed of light (c), wavelength ( ),
and frequency ( ƒ or v):
Fundamentals of RS](https://image.slidesharecdn.com/lect-3fundamentalsofrs-210812131612/85/Lect-3-fundamentals-of-rs-15-320.jpg)
Lect 3 fundamentals of rs
- 1. October 14, 2020 Fundamentals of RS 1 Lecture 3-RS
- 2. Lecture # 03 Dated:14/10/2020 Course(502) Introduction to GIS and RS Fundamentals of Remote Sensing Topic Presented by Rehana Jamal (Geometiciation, GIS Specialist & Geographer) Visiting lecturer studentsdatafiles@gmail.com Faculty of Agricultural Engineering, Arid Agriculture University, Rawalpindi 2 What is Remote sensing Characteristics of Electromagnetic radiation Energy Sources or Illumination How Remote Sensing works? Energy interaction with the Atmosphere Energy Interactions wit the Earth October 14, 2020 Fundamentals of RS Let-3 Let-4
- 3. “Remote Sensing (RS) is the science and art of acquiring information about material objects, area, or phenomenon, without coming into physical contact with the objects, area, or phenomenon under investigation” What is Remote sensing? October 14, 2020 3 Fundamentals of RS Source: https://www.google.com/
- 4. October 14, 2020 Fundamentals of RS 4 Source: https://www.google.com/
- 5. October 14, 2020 Fundamentals of RS 5 RS happens due to the radiation of Electromagnetic waves from coming the sun C (Velocity of light) Source of Electromagnetic waves
- 6. October 14, 2020 Fundamentals of RS 6
- 7. October 14, 2020 7 Source: https://phys.org/news/2018-04-vr-focus-nanostructure-meta-lenses.html Visible Band of Electromagnetic waves Fundamentals of RS
- 8. October 14, 2020 Fundamentals of RS 8 Characteristics of Electromagnetic radiation Electromagnetic Energy can be modelled in two ways i. By waves ii. By Photons (Energy bearing particles) Electromagnetic waves consist of a combination of oscillating electrical and magnetic fields, perpendicular to each other. C (Velocity of light)
- 9. October 14, 2020 Fundamentals of RS 9 Electromagnetic Spectrum Source: https://www.google.com/
- 10. October 14, 2020 Fundamentals of RS 10 Source: https://www.google.com/ Electromagnetic Spectrum
- 11. October 14, 2020 11 i. It can travel through empty space. ii. The speed of light is constant in space. iii. Wavelength: Distance between crests or troughs through visible light iv. Velocity: 186,000 miles per second or 300,000 kilometers per second or 299,790,000m/s or 3*108 m/s v. Amplitude: The amplitude of electromagnetic waves relates to its intensity or brightness(as in the case of visible light) or the maximum extent of a vibration or oscillation, measured from the position of equilibrium (mid point of wavelength) vi. Frequency: The number of crests of the waves that pass by a point per second. Measured in units of hertz(Hz) 1 hertz = 1 wave crest/second Characteristics of Electromagnetic radiation / Crest
- 12. October 14, 2020 Fundamentals of RS 12 / Crest Velocity of light, c
- 13. October 14, 2020 Fundamentals of RS 13 Note the trends: bluer light has shorter wavelength, higher frequency, and more energy. Redder light has longer wavelength, lower frequency, and less energy. Wavelength is a reciprocal of Frequency
- 14. October 14, 2020 Fundamentals of RS 14 f or V = c/ Relation between the speed of light (c), wavelength ( ), and frequency (f or V ): Thus, there is an inverse relationship between wavelength and frequency
- 15. October 14, 2020 15 Thus (frequency [f or V] * wavelength[lambda]) is equal to a constant (c) Relation between the speed of light (c), wavelength ( ), and frequency ( ƒ or v): Fundamentals of RS
- 16. October 14, 2020 Fundamentals of RS 16 Measurement of Electromagnetic Energy(E/Q) The amount of energy held by a photon of a specific wavelength is given by E or Q = h v Since c = v v/ƒ = frequency v/ƒ = c/ h = 6.6262 x 10 -34 j/s Plank’s constant E or Q = h x c/ c = 3 x 10 8 m/s Speed of light is constant E or Q = 6.6262 x 10 -34 (3 x10 8) x (500nm x 10 – 9 m) E or Q = (3.98 x 10 -19 j) (500 x 10 – 9 m) = 500nm
- 17. October 14, 2020 Fundamentals of RS 17 Types of Energy Resources/Types of RS on the basis of Energy (1.Passive & 2.Active) Source: https://www.google.com/
- 18. October 14, 2020 Fundamentals of RS 18 1. Passive Remote Sensing: Makes use of sensors that detect the reflected or emitted electro-magnetic radiation from natural sources. Source: https://www.google.com/
- 19. October 14, 2020 Fundamentals of RS 19 2. Active remote Sensing: Makes use of sensors that detect reflected responses from objects that are irradiated from artificially-generated energy sources, such as radar. Source: https://www.google.com/
- 20. October 14, 2020 Fundamentals of RS 20 Source: https://en.wikipedi a.org/wiki/Remote _sensing#/media/F ile:Remote_Sensin g_Illustration.jpg
- 21. October 14, 2020 Fundamentals of RS 21 How Remote Sensing works?/How the Energy is recorded by the Sensor (D)? Source: https://www.google.com/ Elements of RS
- 23. October 14, 2020 Fundamentals of RS 23 Source: https://www.google.com/ Recording of Energy by the Sensor in the form of Digital Number(DN values)
- 24. October 14, 2020 Fundamentals of RS 24 What is Remote sensing: Spatial data acquisition technique Characteristics of Electromagnetic radiation: wavelength, frequency, amplitude, Energy(Q) Energy Sources or Illumination: Active & Passive Process of RS/Working of RS: Summary
- 25. October 14, 2020 Fundamentals of RS 25 References: • www.google.com • www.wikipedia.com •https://www.nrcan.gc.ca/maps-tools-publications/satellite-imagery-air-photos/remote- sensing-tutorials/fundamentals-remote-sensing-introduction/9363 • https://staff.aub.edu.lb/~webeco/rs%20lectures.htm • Principles of Remote sensing • edited by Lucas L.F. Janssen •https://www.nrcan.gc.ca/sites/www.nrcan.gc.ca/files/earthsciences/pdf/resource/tutor/fu ndam/pdf/fundamentals_e.pdf •http://giswin.geo.tsukuba.ac.jp/sis/tutorial/koko/remotesensing/FundamentalRemoteSe nsing.pdf