20 Questions
What is the primary function of a microwave altimeter?
To compute an object's height above a stable point
What is the term associated with the computation of depth beneath the sea surface?
Bathymetry
What type of systems are more affected by rain, especially in Ku-band systems?
Microwave scatterometers
What is the name of the device that computes an object's height above a stable point?
Altitude meter
What is the principle of operation of microwave altimeters?
They transmit short microwave pulses and measure the round trip time delay
What is the primary purpose of microwave scatterometers?
To achieve high accuracy measurements of wind vectors
What is the primary factor that affects the intensity of backscattered energy in scatterometry?
Roughness and dielectric properties of the target
What is the typical resolution of wind maps produced by scatterometers?
25-50 km
What is the advantage of using microwave scatterometers in terms of weather conditions?
They are available irrespective of weather conditions
What is the relationship between wind stress and the size of surface ripples on the ocean?
Wind stress depends on the size of surface ripples
What type of technique did the ERS and NSCAT instruments employ for wind retrieval?
Fanbeam
What is the primary application of scatterometer data in weather forecasting?
Cyclonic feature prediction
What is the approximate daily coverage of global oceans by a single scatterometer instrument?
90%
What is an emerging application of scatterometer data beyond ocean winds?
Soil moisture measurement
Which of the following scatterometers is onboard the Metop satellite?
ASCAT
What is the primary application of the dependence on the incidence angle in microwave scatterometry?
Deriving wind speed
What is the main difference between fan beam scatterometers and rotating pencil beam scatterometers?
Beam shape and scanning method
Which of the following situations can compromise the quality of scatterometer winds?
Sea ice and land contamination
What is the primary advantage of microwave scatterometers over other wind measurement techniques?
Global coverage
Which of the following instruments is an example of a fan beam scatterometer?
ASCAT
Test your knowledge of microwave remote sensing technologies, including scatterometers and altimeters, their applications, and limitations. Learn about the factors affecting their performance, such as wind speeds and rain, and their use in monitoring sea ice and land.
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