Sensors

Question 1

James Webb Telescope

Answer 1

-orbit 1.5 million km from Earth
-has sun shields
-used for early universe research
–>lifestyle of stars
–> exoplanets
–>study galaxies over time

Question 2

James Webb Telescope Sensors

Answer 2

-Near IR camera
–> 0.6-5 nm wavelength
–> detecting early and number stars in nearby galaxies
-Near IR Spectrograph
–>0.6-5 nm wavelength
–>determine elemental composition of celestial objects
-Mid Infrared Instrument
–> 5-28 nm wavelength
–>view distant galaxies, newly forming stars, comets, etc
-Another spectrograph

Question 3

MODIS satellite

Answer 3

-view earths surface every 1-2 days
-examine landscape with respect to climate change
-705 km altitude
-2300 km swath
-36 spectral bands (0.4 nm to 14.4 nm)
-has data in oceanography, biology, and atmospheric science

Question 4

Hyperion, EO-1

Answer 4

-desgined to test applications for Landsat 8 and to test low cost satellites
-used to analyze disaster events, volcanic activity and more
-push broom style sensor
-30 meter spectral resolution
-220 unique wavelengths
-temporal resolution of 16 days
-data found on EarthExplorer from USGS
-imagery was partially automated
-one of the first hyperspectral remote sensing systems

Question 5

IKONOS

Answer 5

-high resolution satellite
-sun synchronus orbit
-ground track repeats every 11 days
-collects in across and along track from a 45 degree vertical
-4 multispectral bands
-can point at a new target and stabilize in seconds, entire spacecraft moves

Question 6

LiDAR

Answer 6

-Light detection and ranging
-use laser to measure distance btwn earth and aerial sensors
-active sensor attached to plane
-no orbital path
-influenced by travel laser time, scan angle, aircraft acceleration

Question 7

LiDAR Parameters

Answer 7

-Laser scanner
-GPS
-Intertial Navigation System
–> works by detecting rotation of Earth and gravity

Question 8

How LiDAR works

Answer 8

1. Transmits brief pulses of light to ground surface
2. Light reflects off ground features
3. Reflected light is detected by laser sensors
4. Travel time is used to calculate ground surface elevation

Question 9

What are some LiDAR uses

Answer 9

-mapping rivers
-map topography
-forest mapping
-flood zone risks

Question 10

SPOT

Answer 10

-French
-sun synch orbut
-altitude of 832 km
-60 km swath
-temp resolution of 26 days

Question 11

SPOT 5 Multispectral bands

Answer 11

-2 identical high resolution geometric sensors
–>panchromatic band
–> green, red, IR band
–> mid IR band
-Vegetation sensor
–>blue band, red, near IR, mid IR