Podcast
Questions and Answers
Which platform is typically used for multispectral scanning systems?
Which platform is typically used for multispectral scanning systems?
- Ground-based platform
- Airborne platform
- Spaceborne platform
- All of the above (correct)
What is the primary difference between a multispectral scanner and a line camera?
What is the primary difference between a multispectral scanner and a line camera?
- Multispectral scanners use moving mirrors to scan a line, while line cameras record an entire line at once. (correct)
- Multispectral scanners use a single detector, while line cameras use an array of detectors.
- Multispectral scanners use at least one detector per spectral band, while line cameras use a single detector.
- Multispectral scanners sense a broader spectral range, from visible to microwave.
Which of the following is a type of multispectral scanner?
Which of the following is a type of multispectral scanner?
- Pushbroom
- Whiskbroom
- Thermal Infrared Multispectral Scanner (TIMS)
- All of the above (correct)
What is the primary function of a thermal scanner?
What is the primary function of a thermal scanner?
What is the operating wavelength range of thermal scanners?
What is the operating wavelength range of thermal scanners?
Which of the following is an example of a thermal multispectral scanner?
Which of the following is an example of a thermal multispectral scanner?
What is the primary function of a passive microwave scanner?
What is the primary function of a passive microwave scanner?
Which platform is typically used for thermal scanners?
Which platform is typically used for thermal scanners?
What is the key advantage of using a multispectral scanner over a line camera?
What is the key advantage of using a multispectral scanner over a line camera?
Which platform is typically used for passive microwave scanners?
Which platform is typically used for passive microwave scanners?
What is the key difference between a multispectral scanner and a thermal scanner?
What is the key difference between a multispectral scanner and a thermal scanner?
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Study Notes
Types of Sensors
- Active sensors have their own source of energy and can work both day and night, e.g., Radar and Lidar
- Passive sensors measure reflected radiation during the day and emit at night, e.g., ASTER
Remote Sensing Platforms
- A remote sensing platform is a vehicle that carries one or more remote sensors, e.g., satellite, aircraft, or field equipment
- Platforms can be operated at altitudes ranging from a few centimeters above the ground to beyond the atmosphere
- Platforms can be moving (e.g., satellite, aircraft) or static (e.g., high-rise building)
Classification of Remote Sensing Platforms
- Ground-based platform: includes moving vehicles, cranes, cherry-pickers, and tall buildings, used for collecting detailed information
- Airborne platform: includes aircraft, helicopters, hot air balloons, and UAVs, flying higher than 1000m and up to approximately 20km
- Spaceborne platform: includes satellites and space shuttles, producing images with high temporal resolution at low cost
Orbits of Satellites
- Low Earth orbit (LEO): 1-2,000 km above the earth, with high temporal resolution and small coverage area
- Medium Earth orbit (MEO): 5,000-10,000 km above the earth, e.g., communication satellites (GPS)
- Geostationary orbit (GEO): ~35,786 km above the earth, precisely over the equator, with high temporal resolution and large coverage area, e.g., weather satellites
- Polar Orbit: Travels from north pole to south pole, with a special type being Sun-synchronous orbit (SSO)
Multispectral Scanning Systems
- Pushbroom: Multispectral system
- Whiskbroom: Multispectral scanning system, operated from spaceborne and airborne platforms, sensing in broad spectral range from visible to microwave
Thermal Scanners
- Special types of multispectral scanners that provide information related to objects' temperature
- Operates between 7.0µm – 14µm (Thermal infrared region)
- Examples: Thermal Infrared Multispectral Scanner (TIMS) with 6 bands between 8.2 – 12.2 micrometre, ASTER on board of Terra-1 satellite with 5 thermal infrared bands
Passive Microwave Scanner
- A radiometer that detects naturally emitted radiation of the Earth's surface in 10-1000mm
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