lecture 4 Flashcards
whats a satelite
celestial body orbiting the earth or another planet
what is a satelite science
artificial body placed in orbit around the earth or moon or sanither planet to collect information or communication
what are the types of orbit
geostationary, low earth orbit, medium earth orbit, high earth orbit
where does geostationary orbit
just above the equator
what does geostationary orbiting satellite do
communication and weather
what is low earth orbiting used for
(leo) remote sensing
how many sent to leo and how many still works
3000 sent, 1200 still works
how high does leo orbit
2000km
how fast does leo orbit
90~130 minute
what is meo used for
navigation and communication such as GPS, glonass and galileo
where does MEO orbit
20,000km
what is high earth orbiting satelite do
study stuff beyond earth
sometimes earth weather
wheree does high earth orbit
36,000km
how many of satelute in irbit actually work
25%
what are the 5 different satellite systems
weather, communication, earth observation, astronomical, minarures
weather satellites use
measure amount of heat energy how much water in clouds
communication example for satellite
internet tv etc.
earth observation eg satelite
vegetation change flooding temperature changes
astronomical satellites used for
potential meteor
gps abbreviation
global positioning system
whats triangulation
tells location depending the amount of satellites you are connected to
the intersection determines your location
how many satellites do you need for a god guess off location
4
what are the two types of sensors
passive active
what are passive sensors
collecting data using natural resources
use of passive sensors
satellite photo, vegetation changes, fire hazard
what is an active sensors
send something and take days collecting days you have sent out
three examples of active sensors
LiDAR
RANAR
SONAR
what is lidar abbreviation
light detection and ranging
what is radar abbreviation
radio detection and ranging
what is sonar abbreviation
sound detection and ranging
what ours ratio detection used in
radio waves to determine the range angle or velocity on objects
SRTM abbreviation
shuttle radar topography mission
what is srtm used for
accurate digital elevation mission
example of aerial images
orthophoto, stereoscopic photo SFT (structure from motion)
what is orthophoto
aerial photographer image geometrically corrected
what is stereoscopic photo
strip pair image containing two views is a scene side by side
example of primary data collection using raster
remote sensing image aerial photography
example of primary data connection using vector
GNSS data collection survey
what is GNSS
global navigation satellite system
example of secondary data collection using raster
scanning maps DEMs from maps
DEM abbreviation
digital elevation model
example of secondary data collection using vector
digitisation vectorising object from maps
