Chapter 3 sensors and platforms part 1 Flashcards Preview

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Flashcards in Chapter 3 sensors and platforms part 1 Deck (97)
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1

Platforms refer to

the structures or vehicles on which remote sensing instruments are mounted.

2

The platform on which a particular sensor is housed determines a number of attributes, which may dictate

the use of particular sensors

3

The platform on which a particular sensor is housed determines a number of attributes, which may dictate the use of particular sensors. These attributes include:

distance the sensor is from the object of interest, periodicity of image acquisition, timing of image acquisition, and location and extent of coverage.

4

There are three broad categories of remote sensing platforms:

ground based, airborne, and satellite.

5

A represents

Spaceborne:
satellite
shuttle

6

B represent

Airborne:
Aeroplane
Helicopter
Hot air ballon
Air ship
Tethered balloon

7

C represent

Ground-based:

hand-held
Raised platform

8

A wide variety of ground based platforms are used in remote sensing. Some of the more common ones are

are hand held devices, tripods, towers and cranes

9

Instruments that are ground-based are often used to

to measure the quantity and quality of light coming from the sun or for close range characterization of objects.

10

used to measure the quantity and quality of light coming from the sun or for close range characterization of objects. For example, to

to study properties of a single plant or a small patch of grass, it would make sense to use a ground based instrument.

11

Laboratory instruments are used

almost exclusively for research, sensor calibration, and quality control.

12

Laboratory instruments are used almost exclusively for research, sensor calibration, and quality control. Much of what is learned from laboratory work is used to

understand how remote sensing can be better utilized to identify different materials.

13

Much of what is learned from laboratory work is used to understand how remote sensing can be better utilized to identify different materials. This contributes to

to the development of new sensors that improve on existing technologies.

14

Field instruments are largely used for

research purposes

15

Field instruments are also largely used for research purposes. This type of remote sensing instrument is often

hand-held or mounted on a tripod or other similar support

16

Field instruments are also largely used for research purposes. This type of remote sensing instrument is often hand-held or mounted on a tripod or other similar support. An example for field remote sensing instruments used in meteorology is

Doppler on Wheels (or DOW)

17

DOW

DOW is a fleet of radar trucks maintained by the Center for Severe Weather Research (CSWR) in Boulder, Colorado.

18

: Mobile ozone and aerosol lidar for field campaigns. Profiles ozone and aerosol between 100m‒4 km.

19

Permanent ground platforms are typically used for

monitoring atmospheric phenomenon

20

Permanent ground platforms are typically used for monitoring atmospheric phenomenon, although they are also used for

long-term monitoring of terrestrial features

21

Towers and cranes are often used to support research projects where

 a reasonably stable, long-term platform is necessary.

22

Towers can be built

on site and can be tall enough to project through a forest canopy so that a range of measurements can be taken from the forest floor, through the canopy and from above the canopy

23

Weather radars are the best examples for

the permanent ground platforms that are typically used for monitoring atmospheric phenomenon.

24

Doppler radar

25

Airborne platforms were

the sole non-ground-based platforms for early remote sensing work.

26

Balloons are rarely used today because 

they are not very stable and the course of flight is not always predictable

27

Balloons are rarely used today because they are not very stable and the course of flight is not always predictable, although small balloons carrying expendable probes

are still used for some meteorological research.

28

At present, airplanes are

the most common airborne platform

29

Nearly the ______________________________are used for remote sensing applications.

whole spectrum of civilian and military aircraft

30

Nearly the whole spectrum of civilian and military aircraft are used for remote sensing applications. When

altitude and stability requirements for a sensor are not too demanding, simple, low-cost aircraft can be used as platforms.