midterm exam

Question 1

may help in capturing fine detail, but
at a cost

Answer 1

Fine spatial resolution

Question 2

Refers to the specific wavelength intervals in the
electromagnetic spectrum that a sensor can record

Answer 2

SPECTRAL RESOLUTION

Question 3

High spatial resolution

Answer 3

0.6 -4 m

Question 4

the revisiting frequency of
a satellite sensor for a specific location

Answer 4

temporal resolution

Question 5

2-3 days depending on Latitude(revisit time)

Answer 5

SPOT-5

Question 6

are collected by the image
sensors (e.g. CCD, CMOS) and
accumulates charge proportional to
intensity of radiation

Answer 6

Photons

Question 7

1-3.5 days depending on Latitude(revisit time)

Answer 7

QuickBird

Question 8

12-bit (4096 levels

Answer 8

Landsat 8

Question 9

spectral resolution
High :?
Medium :?
Low :?

Answer 9

220
3 -15 bands
3 bands

Question 10

increasing data’s
intelligibility as a representation of the object being
sensed

Answer 10

Display and Enhancement

Question 11

is a representation of a two-dimensional
array of so-called picture elements or pixels. It contains a
fixed number of rows and columns of pixels.

Answer 11

Digital Image

Question 12

extracting
meaningful patterns from the data

Answer 12

Classification and Information Extraction

Question 13

ability of imaging system to
record fine detail in a distinguishable manner

Answer 13

Resolution

Question 14

High temporal resolution:?
Medium temporal resolution:?
Low temporal resolution:?

Answer 14

< 24 hours -3 days
4 -16 days
> 16 days

Question 15

Low spatial resolution

Answer 15

30 -> 1000 m

Question 16

It refers to the size of the smallest object that can be
resolved on the ground

Answer 16

spatial resolution

Question 17

defines smallest area viewed by sensor

Answer 17

IFOV

Question 18

Each band is treated separately

Answer 18

BAND SEQUENTIAL

Question 19

Ability of sensor to record many levels of brightness

Answer 19

radiometric resolution

Question 20

additive colors

Answer 20

Blue, green, red primarie

Question 21

can be
added, subtracted,
multiplied, divided and
subjected to statistical
manipulation

Answer 21

Brightness

Question 22

Pixels not completely occupied by
single, homogeneous category

Answer 22

SPATIAL RESOLUTION-MIXED PIXELS

Question 23

is the time interval allowing accumulation of
enough photons to generate strong signal

Answer 23

Dwell time

Question 24

It establishes the lower limit for level of spatial detail

Answer 24

IFOV

Question 25

Each pixel has an________ (represented by a digital number) and a _________ (referenced by its row and column numbers)

Answer 25

intensity value, location address

Question 26

Values for all 4 bands are written before the values for the next pixel

Answer 26

BAND INTERLEAVED BY PIXEL

Question 27

Medium spatial resolution

Answer 27

4 -30 m

Question 28

Fineness of spatial detail visible in the image

Answer 28

spatial resolution

Question 29

number of mixed pixels increase with respect to pure background and pure interior pixels

Answer 29

Coarser spatial resolution

Question 30

Ability of sensor to define fine wavelength intervals

Answer 30

SPECTRAL RESOLUTION

Question 31

Landsat-7/8 (revisit time)

Answer 31

16 days

Question 32

removal of systematic errors in data

Answer 32

Pre-processing

Question 33

Depends on altitude, speed, and sensitivity of detectors

Answer 33

Dwell time

Question 34

record scene using only few brightness levels or few bits (e.g., 8 bit 2^8BVs (0 255)

Answer 34

Coarse radiometric resolution

Question 35

A collection of techniques for the manipulation of digital images by computers.

Answer 35

digital image processing

Question 36

subtractive color

Answer 36

Cyan, magenta, yellow

Question 37

are the smallest individual element in an image, holding quantized values that represent the brightness of a given color at any specific point.

Answer 37

Pixels

Question 38

approximately 3 days at 40°Latitude(revisit time)

Answer 38

IKONOS

Question 39

Refers to the smallest change in intensity level that can be detected by the sensing system

Answer 39

radiometric resolution

Question 40

Line values for all 4 bands are written before the values for the next line

Answer 40

BAND INTERLEAVED BY LINE