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Remote Sensing > Lecture 6 - Major Spaceborne remote sensing systems > Flashcards

Lecture 6 - Major Spaceborne remote sensing systems Flashcards

1
Q

Landsat Programme Info

A

Primary mission: to map Earth’s terrestrial and coastal areas

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2
Q

Landsat Temporal resolution

A

16 days

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3
Q

Landsat Spatial resolution

A

30 metres

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4
Q

Landsat Wavebands

A

Visible and IR

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5
Q

Landsat data acquisition

A

Satellite in polar orbit with altitude of 705km
Swath of 185km
16 day repeat cycle

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6
Q

Landsat Sensors

A
  1. Return Beam vidicon camera RBV
  2. Multi spectral scanner MSS
  3. Thematic mapper TM
  4. Enhanced thematic mapper ETM +
  5. Operation Land Imager OLI
  6. Thermal Infrared Sensor TIRS
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7
Q

Advantages of Landsat Sensors

A

All have similar spectral wavebands
Allows for long-term timeseries analysis

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8
Q

ESAs Sentinel

A

Active Sensor

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9
Q

Sentinel 1 -

A

Synthetic Arperture imaging
All weather, day/night applications

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10
Q

Sentinel 2 -

A

Multispectral imaging
Land applications: urbans, forest agriculture

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11
Q

Sentinel Temporal resolution

A

10 days

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12
Q

Advantage of Sentinel 2s ‘s Multispectral instrument

A

Contrains wavebands in “red edge”
So can analyse vegetation chlorophyll content

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13
Q

Planet Labs

A

Cubesats
10x10x30 centimetres
Cheap to launch

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14
Q

Planet Labs Spatial resolution

A

3-5m, due to low orbit height

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15
Q

Planet Labs spectral bands?

A

4-8

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16
Q

Planet Labs Image swath?

A

32km

17
Q

Advantages of Planet Labs Cubesats

A

Frequent global coverage due to having hundreds of satellites
High revisit time - 30 hours

18
Q

NASAs Terra and Aqua Satellites

A

Have sensors to observe total earth system and effects of natural and human-induced changes on global environment.

19
Q

MODIS

A

Moderate Resolution Imaging Spectroradiometer (MODIS)

  • Observations of land, oceans, and atmosphere
  • 3 different spatial resolutions
  • 2 bands between 0.620 micro and 0.876 micro at 250m
  • 5 bands between 0.459 micro and 2.155 micro at 500m
  • 29 bands between 0.405 micro and 14.385 micro at 1km

Remote Sensing (14 decks)

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