El's Qs (Annotated notes)

Question 1

Not all parts of the Philippines has red sunsets because…

Answer 1

there is not enough wavelength to scatter wavelength.

Question 2

Something that is unique to something

Answer 2

index

Question 3

bending of light when it travels from one medium to another

Answer 3

refraction

Question 4

Theory that shows relationship of wavelength and frequency

Answer 4

wave theory

Question 5

Are the GNSS (Global Navigation
satellite system) remote sensing?

Answer 5

No.
Explanation: they send signal to the receiver on the earth which tells the location in the speed of light

Question 6

Why should there be more than two datasets when studying a phenomenon?

Answer 6

to compensate the error from your back bearing
process of triangulation:
find a distinguishable feature
get the back bearing

Question 7

Theory that states that wavelength has matter and density

Answer 7

particle theory

Question 8

measuring and gathering data without contact

Answer 8

remote sensing

Question 9

why do we get data?

Answer 9

to get information

Question 10

T or F: data analysis needs to be checked and validated

Answer 10

T because it’s procured remotely

Question 11

DTM (Digital Topography Model) is a terrain without anything so it is sometimes called…

Answer 11

bald earth

Question 12

simplistic representation of data

Answer 12

diagram

Question 13

T or F: increase of temperature would decrease the radiant energy raised to the power of four

Answer 13

F increase the radiant energy. Change in radiant energy will drastically change the temperature

Question 14

T or F:
more energy = less information

Answer 14

F less energy = less information
Explanation: the longer path, chances are, data is lesser than that of ones with shorter path length

Question 15

What corrections should you apply to raw data from the sensor?

Answer 15

Geographical, Atmospherical, Geological

Question 16

T or F: remote sensing is limited to satellites

Answer 16

F hand held sensors are also considered

Question 17

Simulates how gamma rays are naturally in the air

Answer 17

Gamma ray simulator

Question 18

T or F: there are natural gamma ray emission

Answer 18

T

Question 19

the number from the field that you get from your sensor, satellite image

Answer 19

data
ex: DEM

Question 20

pattern recognition produces…

Answer 20

information

Question 21

getting things useful from datasets, useable to the end user

Answer 21

information

Question 22

T or F: remote sensing requires to be able to recognize the pattern

Answer 22

T

Question 23

Types of data used in remote sensing

Answer 23

• Variations in force distributions
• Acoustic wave distributions
• Electromagnetic distributions

Question 24

representation if earth was only covered by oceans

Answer 24

Geoid

Question 25

T or F: electromagnetic energy sensor only measures the energy, not the light

Answer 25

T

Question 26

use for viewing and interpreting the data sets

Answer 26

data analysis

Question 27

airborne and space-borne, counts how many energy it receives, it has light but also energy, it measures the energy not the light

Answer 27

electromagnetic energy sensor

Question 28

the electromagnetic remote sensing process is used for...

Answer 28

inventory, mapping, and monitoring earth resources

Question 29

use sensors to record EM reflection and emission, doesn’t concern the geologist (instrumentation, etc.)

Answer 29

data acquisition

Question 30

T or F: Remote sensing = non contact, need to have reference point, actual in-contact data

Answer 30

T

Question 31

mathematical relationship between features

Answer 31

topology

Question 32

clustering of the high and low values

Answer 32

heat map

Question 33

diagram that shows the frequency and direction

Answer 33

rose diagram

Question 34

why is there differential transmittance?

Answer 34

lens is not ideal

Question 35

non uniform exposure in the focal plane due to variation in focal plane

Answer 35

exposure falloff

Question 36

T or F: further from image = higher exposure

Answer 36

T

Question 37

what causes vignette

Answer 37

shadows

Question 38

selects which wavelengths of energy reflected from a scene to reach the image plane

Answer 38

filters

Question 39

absorb wavelengths that do not benefit the study

Answer 39

absorption filters

Question 40

T or F: there is actual low pass filters

Answer 40

F explanation: interference filter - actually a low pass filter

Question 41

why is a lower f-stop used for low light?

Answer 41

low light reaches the image plane. aperture of camera has greater effect on the volume of light that comes in.

Question 42

T or F: only emitted EM energy are analyzed to provide information

Answer 42

F The emitted and reflected EM energy from the air- borned and spaceborne sensors are analyzed to provide information.

Question 43

high reflected radiation energy produces: A. narrow B. wide image

Answer 43

B. wide

Question 44

which is more important in RS? a. specular reflection b. diffused reflection

Answer 44

b. diffused

Question 45

what causes hotspots?

Answer 45

hotspot happens when sun and zenith angles of sensor is the same direction

Question 46

why is true color not deterministic and deceiving in RS?

Answer 46

due to broad morphological features

Question 47

used for highlighting the target, contain more info for analyzing images

Answer 47

false color image

Question 48

if the slope is facing the light source, it will be: a. lighter b. darker

Answer 48

a. lighter it will be non uniform due to slope

Question 49

what perspective view is good for presenting data?

Answer 49

Three-dimensional perspective view

Question 50

Terrain is...

Answer 50

ground surface

Question 51

sharper v-shape contours mean...

Answer 51

deeper landscape

Question 52

DSM - DTM = ?

Answer 52

CHM (canopy height model)

Question 53

Is digital Terrain Model (DTM) is processed data?

Answer 53

Yes, it's a mathematical algorithm that averages the value of the data

Question 54

why is there no collaboration between satellites from different countries?

Answer 54

different signal, different receivers that have different clocks, different orbital

Question 55

organized information that has spatial data

Answer 55

geodatabase

Question 56

are the datasets in the geodatabase relational?

Answer 56

yes. there is a predefined condition on how one dataset is connected to another. there is a primary key that connects the data and these are unique. but a foreign key can be used which can be duplicated

Question 57

a camera where you can adjust the aperture

Answer 57

SLR

Question 58

main use of aerial photography

Answer 58

common as it covers most of the land areas, versatile (can be used for different analysis, high res, archived since it’s from film), economical (camera, aircraft, develop film, aerial photo), multiple users can use aerial photos