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Page 1 Lesson 7: Remote Sensing Dr Andrew Ketsdever MAE 5595 Page 2 Lesson 7: Remote Sensing Dr Andrew Ketsdever MAE 5595 Outline • Electromagnetic Radiation • Blackbody Radiation • Atmospheric Windows • Instrument Parameters • Remote Sensing Architectures Page 3 Lesson 7: Remote Sensing Dr Andrew Ketsdever MAE 5595 Outline • Electromagnetic Radiation • Blackbody Radiation • Atmospheric Windows • Instrument Parameters • Remote Sensing Architectures EM Radiation • Photon wavelength, frequency and energy ?? = c ? h E = h = 6.626 x 10 -34 J sec Page 4 Lesson 7: Remote Sensing Dr Andrew Ketsdever MAE 5595 Outline • Electromagnetic Radiation • Blackbody Radiation • Atmospheric Windows • Instrument Parameters • Remote Sensing Architectures EM Radiation • Photon wavelength, frequency and energy ?? = c ? h E = h = 6.626 x 10 -34 J sec EM Radiation • Communications • Microwaves: 1 mm to 1 m wavelength. The microwaves are further divided into different frequency (wavelength) bands: (1 GHz = 10 9 Hz) – P band: 0.3 - 1 GHz (30 - 100 cm) – L band: 1 - 2 GHz (15 - 30 cm) – S band: 2 - 4 GHz (7.5 - 15 cm) – C band: 4 - 8 GHz (3.8 - 7.5 cm) – X band: 8 - 12.5 GHz (2.4 - 3.8 cm) – Ku band: 12.5 - 18 GHz (1.7 - 2.4 cm) – K band: 18 - 26.5 GHz (1.1 - 1.7 cm) – Ka band: 26.5 - 40 GHz (0.75 - 1.1 cm) – V band: 50 – 75 GHz – W band: 75 – 111 GHz Page 5 Lesson 7: Remote Sensing Dr Andrew Ketsdever MAE 5595 Outline • Electromagnetic Radiation • Blackbody Radiation • Atmospheric Windows • Instrument Parameters • Remote Sensing Architectures EM Radiation • Photon wavelength, frequency and energy ?? = c ? h E = h = 6.626 x 10 -34 J sec EM Radiation • Communications • Microwaves: 1 mm to 1 m wavelength. The microwaves are further divided into different frequency (wavelength) bands: (1 GHz = 10 9 Hz) – P band: 0.3 - 1 GHz (30 - 100 cm) – L band: 1 - 2 GHz (15 - 30 cm) – S band: 2 - 4 GHz (7.5 - 15 cm) – C band: 4 - 8 GHz (3.8 - 7.5 cm) – X band: 8 - 12.5 GHz (2.4 - 3.8 cm) – Ku band: 12.5 - 18 GHz (1.7 - 2.4 cm) – K band: 18 - 26.5 GHz (1.1 - 1.7 cm) – Ka band: 26.5 - 40 GHz (0.75 - 1.1 cm) – V band: 50 – 75 GHz – W band: 75 – 111 GHz EM Radiation • Heat energy is the KE of random motion of the particles in matter • Temperature is the measure of heat energy concentrated in a substance • Random motion results in COLLISIONS • COLLISIONS cause changes in the internal energy of the molecules • Internal energy modes relax to ground state by giving off photons (EM Radiation)Read More
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FAQs on Remote Sensing - Geomatics Engineering (Surveying) - Civil Engineering (CE)
| 1. What is remote sensing in civil engineering? |  |
Ans. Remote sensing in civil engineering refers to the use of satellite or aerial imagery to collect data and information about the Earth's surface for various engineering applications. It involves the analysis of remotely sensed data to understand and monitor the physical properties, terrain, and infrastructure of civil engineering projects.
| 2. How is remote sensing used in civil engineering? | |
Ans. Remote sensing is used in civil engineering for a variety of purposes, including mapping and monitoring of land cover, terrain analysis, environmental assessment, and infrastructure planning. It helps engineers gather information about the Earth's surface remotely and make informed decisions during the design, construction, and maintenance of civil engineering projects.
| 3. What are the advantages of remote sensing in civil engineering? | |
Ans. Remote sensing offers several advantages in civil engineering, including its ability to provide large-scale and up-to-date data for analysis. It allows engineers to assess and monitor project sites remotely, reducing the need for physical surveys. Remote sensing also provides valuable information on inaccessible or hazardous areas, helping engineers make informed decisions and improve project efficiency.
| 4. What are the limitations of remote sensing in civil engineering? | |
Ans. While remote sensing has numerous benefits, it also has some limitations in civil engineering. The accuracy of the data collected through remote sensing depends on various factors such as weather conditions, sensor resolution, and data processing techniques. Additionally, remote sensing may not provide detailed information on the subsurface conditions, requiring additional ground-based investigations for accurate analysis.
| 5. What are some applications of remote sensing in civil engineering? | |
Ans. Remote sensing finds applications in civil engineering in various areas. It is used for land cover classification, monitoring of construction sites, detection of structural changes, assessment of environmental impacts, and flood mapping. Additionally, remote sensing data can be integrated with Geographic Information Systems (GIS) to support decision-making processes in urban planning, transportation, and infrastructure management.
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