Question 1

A sensor that will be measuring only one wide band of wavelengths is which type of sensor?
A)Panchromatic sensor
B)Multispectral sensor
C)Hyperspectral sensor
D)Radiometric sensor

Accepted Answer

A sensor that measures only one wide band of wavelengths is called a panchromatic sensor. This is in contrast to multispectral sensors, which measure several narrow bands, and hyperspectral sensors, which measure many narrow bands. Radiometric sensors measure radiation, but this term is not typically used to describe a type of remote sensing sensor.

Question 2

A typical Landsat TM scene measures about
A)170 * 183 km.
B)16 * 16 km.
C)181 * 197 km.
D)7.5 km * 7.5 km.

Accepted Answer

A typical Landsat Thematic Mapper (TM) scene covers an area of approximately 170 km by 183 km.

Question 3

Pan-sharpening is used to
A)sense multiple small bands simultaneously in the panchromatic portion of the EM spectrum.
B)fuse panchromatic imagery with multispectral imagery to get a finer image.
C)take the pixels of an existing image and transform them into finer resolution pixels.
D)narrow down the sensor's swath width and obtain finer spatial resolution for a sensor.

Accepted Answer

Pan-sharpening involves fusing panchromatic imagery (which has high spatial resolution but only captures one wavelength) with multispectral imagery (which captures multiple wavelengths but has lower spatial resolution) in order to create a composite image with both high spatial and spectral resolution.

Question 4

An 11-bit sensor can measure how many levels?
A)11
B)121
C)256
D)2048

Accepted Answer

An 11-bit sensor can measure 2^11 or 2048 levels. Therefore, the correct answer is D.

Question 5

Which of the following satellites' panchromatic sensors has the coarsest spatial resolution sensor?
A)IKONOS
B)Quickbird
C)WorldView-1
D)WorldView-2

Accepted Answer

IKONOS has the coarsest spatial resolution sensor among the given options.

Question 6

Landsat 7 carries which of the following sensors?
A)HRG
B)MSS
C)TM
D)ETM+

Accepted Answer

Landsat 7 carries the Enhanced Thematic Mapper Plus (ETM+) sensor.

Question 7

Satellites in near-polar orbit
A)follow a north-to-south orbital path.
B)follow an east-to-west orbital path.
C)are "locked" into a constant orbital fixed position near either the north or south pole.
D)use the equator as the orbital path being followed.

Accepted Answer

Satellites in near-polar orbit follow a north-to-south orbital path, passing close to or over the Earth's poles as they orbit. This type of orbit is useful for Earth observation and remote sensing, as it allows for complete coverage of the planet's surface.

Question 8

A sensor's ability to determine fine differences in a band of energy measurements is a sensor's
A)spectral resolution.
B)spatial resolution.
C)radiometric resolution.
D)temporal resolution.

Accepted Answer

Radiometric resolution refers to a sensor's ability to distinguish between small differences in energy (or intensity of light) that it measures. It essentially describes the sensitivity of a sensor to variations in signal strength.

Question 9

What is the status of Landsat 7?
A)It was decommissioned and replaced in orbit by Landsat 8 in 2011.
B)Its scan-line corrector failed in 2003.
C)It did not achieve orbit and was replaced with the LDCM program.
D)It continues its mission unabated (alongside Landsat 5).

Accepted Answer

Landsat 7's scan-line corrector failed in 2003, which limits the quality of its images. However, it continues to operate alongside Landsat 8.

Question 10

Off-nadir viewing allows a sensor
A)to obtain imagery with a half-meter or finer resolution.
B)to sense beyond the usual 8-bit range of values.
C)to image locations not directly under the sensor.
D)to image more than 100 bands simultaneously.

Accepted Answer

Off-nadir viewing allows a sensor to image locations not directly under the sensor, meaning the sensor can capture images at angles other than straight down. This technique is particularly useful when imaging rugged terrains or urban areas, where direct overhead viewing may be obstructed by buildings or topographic features. It does not affect the sensor's ability to obtain high resolution or sense beyond the 8-bit range of values, nor does it increase the number of bands that can be imaged simultaneously.

Question 11

An early satellite remote sensing program that used film for taking images was
A)Pleiades.
B)Spot.
C)Earlybird.
D)Corona.

Accepted Answer

Corona was the first satellite remote sensing program that used film for taking images, starting in the late 1950s.

Question 12

A sun-synchronous orbit indicates that
A)the satellite continually images the same sun-illuminated location on the ground .
B)the orbit is set up so that an area on the ground is imaged at the same time of day.
C)the satellite orbits the Sun in the same orbital path as the Moon.
D)the orbit is set up so that the sun-side of the Earth is imaged exactly twice in one day.

Accepted Answer

A sun-synchronous orbit is designed so that the satellite passes over a specific area on the Earth's surface at the same time of day. This is achieved by aligning the orbit with the Earth's rotation and with the direction of the Sun's rays, so that the satellite is always in sunlight when it passes over a particular point on the Earth's surface. This allows for consistent lighting conditions for imaging and other remote sensing applications.

Question 13

Landsat 7's sensor has the capability to see the same area on the ground every
A)2 days.
B)8 days.
C)16 days.
D)26 days.

Accepted Answer

Landsat 7's sensor has a repeat cycle of 16 days, meaning it can capture images of the same area on the ground every 16 days.

Question 14

A whiskbroom sensor is a(n)
A)hyperspectral sensor.
B)linear-array sensor.
C)along-track sensor.
D)across-track sensor.

Accepted Answer

A whiskbroom sensor is an across-track sensor that uses a rotating mirror to scan the terrain perpendicular to the flight path.

Question 15

A geostationary satellite
A)rotates at the same speed as the Earth.
B)completes an orbit around the Earth every 12 hours.
C)takes 16 days to complete its orbital path.
D)takes exactly two days to complete a single orbit.

Accepted Answer

A geostationary satellite has an orbital period of 24 hours, which is the same as the Earth's rotation period. This allows it to stay stationary above a specific location on Earth, making it ideal for applications such as communication and weather forecasting. Choices B, C, and D are incorrect because they describe orbits with different periods than what a geostationary satellite would have.

Question 16

The ground size of one pixel's worth of imagery is a measure of
A)radiometric resolution.
B)spectral resolution.
C)temporal resolution.
D)spatial resolution.

Accepted Answer

The spatial resolution refers to the ground size of one pixel's worth of imagery. Radiometric resolution refers to the sensitivity of the sensor to measure variations in electromagnetic signals, spectral resolution refers to the number and width of bands in the electromagnetic spectrum that a sensor can measure, and temporal resolution refers to the frequency of image acquisition over time.

Question 17

How often a satellite can return to image the same area on the ground is a measure of that sensor's
A)temporal resolution.
B)spectral resolution.
C)spatial resolution.
D)radiometric resolution.

Accepted Answer

Temporal resolution is the ability of a satellite sensor to image the same area repeatedly over time. Therefore, how often a satellite can return to image the same area on the ground is a measure of its temporal resolution. Spectral resolution is the ability of a sensor to distinguish between different wavelengths of electromagnetic radiation. Spatial resolution is the ability of a sensor to distinguish between objects or features on the ground. Radiometric resolution is the ability of a sensor to detect and measure the electromagnetic radiation reflected or emitted by objects on the ground.

Question 18

Which of the following satellites' multispectral sensors has the finest spectral resolution?
A)IKONOS
B)Quickbird
C)GeoEye-1
D)WorldView-2

Accepted Answer

WorldView-2 has eight spectral bands in the visible and near-infrared regions with a spectral resolution of 1.85 nm, which is the finest among the given options.

Question 19

The specific bands and wavelengths that a sensor can measure defines its
A)temporal resolution.
B)radiometric resolution.
C)spatial resolution.
D)spectral resolution.

Accepted Answer

Spectral resolution refers to the ability of a sensor to detect and distinguish between different wavelengths or bands of the electromagnetic spectrum. Therefore, the specific bands and wavelengths that a sensor can measure are what define its spectral resolution.

Question 20

Which of the following satellites' carries the finest spatial resolution sensor?
A)WorldView-2
B)IKONOS
C)GeoEye-1
D)Quickbird

Accepted Answer

The answer of Which of the following satellites' carries the...

Quiz 11: Images From Space

A sensor that will be measuring only one wide band of wavelengths is which type of sensor?

A typical Landsat TM scene measures about

Pan-sharpening is used to

An 11-bit sensor can measure how many levels?

Which of the following satellites' panchromatic sensors has the coarsest spatial resolution sensor?

Landsat 7 carries which of the following sensors?

Satellites in near-polar orbit

A sensor's ability to determine fine differences in a band of energy measurements is a sensor's

What is the status of Landsat 7?

Off-nadir viewing allows a sensor

An early satellite remote sensing program that used film for taking images was

A sun-synchronous orbit indicates that

Landsat 7's sensor has the capability to see the same area on the ground every

A whiskbroom sensor is a(n)

A geostationary satellite

The ground size of one pixel's worth of imagery is a measure of

How often a satellite can return to image the same area on the ground is a measure of that sensor's

Which of the following satellites' multispectral sensors has the finest spectral resolution?

The specific bands and wavelengths that a sensor can measure defines its

Which of the following satellites' carries the finest spatial resolution sensor?