El's Qs (Annotated notes) Flashcards
Not all parts of the Philippines has red sunsets because…
there is not enough wavelength to scatter wavelength.
Something that is unique to something
index
bending of light when it travels from one medium to another
refraction
Theory that shows relationship of wavelength and frequency
wave theory
Are the GNSS (Global Navigation
satellite system) remote sensing?
No.
Explanation: they send signal to the receiver on the earth which tells the location in the speed of light
Why should there be more than two datasets when studying a phenomenon?
to compensate the error from your back bearing
process of triangulation:
find a distinguishable feature
get the back bearing
Theory that states that wavelength has matter and density
particle theory
measuring and gathering data without contact
remote sensing
why do we get data?
to get information
T or F: data analysis needs to be checked and validated
T because it’s procured remotely
DTM (Digital Topography Model) is a terrain without anything so it is sometimes called…
bald earth
simplistic representation of data
diagram
T or F: increase of temperature would decrease the radiant energy raised to the power of four
F increase the radiant energy. Change in radiant energy will drastically change the temperature
T or F:
more energy = less information
F less energy = less information
Explanation: the longer path, chances are, data is lesser than that of ones with shorter path length
What corrections should you apply to raw data from the sensor?
Geographical, Atmospherical, Geological
T or F: remote sensing is limited to satellites
F hand held sensors are also considered
Simulates how gamma rays are naturally in the air
Gamma ray simulator
T or F: there are natural gamma ray emission
T
the number from the field that you get from your sensor, satellite image
data
ex: DEM
pattern recognition produces…
information
getting things useful from datasets, useable to the end user
information
T or F: remote sensing requires to be able to recognize the pattern
T
Types of data used in remote sensing
- Variations in force distributions
- Acoustic wave distributions
- Electromagnetic distributions
representation if earth was only covered by oceans
Geoid
T or F: electromagnetic energy sensor only measures the energy, not the light
T
use for viewing and interpreting the data sets
data analysis
airborne and space-borne, counts how many energy it receives, it has light but also energy, it measures the energy not the light
electromagnetic energy sensor
the electromagnetic remote sensing process is used for…
inventory, mapping, and monitoring earth resources
use sensors to record EM reflection and emission, doesn’t concern the geologist (instrumentation, etc.)
data acquisition
T or F: Remote sensing = non contact, need to have reference point, actual in-contact data
T
mathematical relationship between features
topology
clustering of the high and low values
heat map
diagram that shows the frequency and direction
rose diagram
why is there differential transmittance?
lens is not ideal
non uniform exposure in the focal plane due to variation in focal plane
exposure falloff
T or F: further from image = higher exposure
T
what causes vignette
shadows
selects which wavelengths of energy reflected from a scene to reach the image plane
filters
absorb wavelengths that do not benefit the study
absorption filters
T or F: there is actual low pass filters
F
explanation: interference filter - actually a low pass filter
why is a lower f-stop used for low light?
low light reaches the image plane. aperture of camera has greater effect on the volume of light that comes in.
T or F: only emitted EM energy are analyzed to provide information
F
The emitted and reflected
EM energy from the air-
borned and spaceborne
sensors are analyzed to
provide information.
high reflected radiation energy produces:
A. narrow
B. wide
image
B. wide
which is more important in RS?
a. specular reflection
b. diffused reflection
b. diffused
what causes hotspots?
hotspot happens when sun and zenith angles of sensor is the same direction
why is true color not deterministic and deceiving in RS?
due to broad morphological features
used for highlighting the target, contain more info for analyzing images
false color image
if the slope is facing the light source, it will be:
a. lighter
b. darker
a. lighter
it will be non uniform due to slope
what perspective view is good for presenting data?
Three-dimensional perspective view
Terrain is…
ground surface
sharper v-shape contours mean…
deeper landscape
DSM - DTM = ?
CHM (canopy height model)
Is digital Terrain Model (DTM) is processed data?
Yes, it’s a mathematical algorithm that averages the value of the data
why is there no collaboration between satellites from different countries?
different signal, different receivers that have different clocks, different orbital
organized information that has spatial data
geodatabase
are the datasets in the geodatabase relational?
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
a camera where you can adjust the aperture
SLR
main use of aerial photography
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
