Introduction Flashcards

1
Q

What is remote sensing?

A

Remote sensing is any technique that acquires data and information regarding a specific object without coming into physical contact with that object

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2
Q

Remote Sensing is a top-down process, what are the 4 steps

A
  • User Driven Questions
  • Appropriate data acquisition
  • Image Classification Classifiers and Decision Rules
  • Accuracy Assessment
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3
Q

What are the 4 different spatial resolutions?

A
  • spatial
  • spectral
  • temporal
  • radiometric
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4
Q

What is spectral resolution/?

In multispectral cameras what band is usually used?

A

Refers to the sensors design as related to the spectral width that is recorded per band/channel

  • 10nm
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5
Q

What is Radiometric Resolution?

A

The data which comprises the remotely-sensed image is stored as a matrix of numbers.

  • ranging 8 - 32 bit.
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6
Q

8 bit or 32 bit which has more detail?

A

32 bit, more bits more detail and precision.

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7
Q

What type of energy does remote sensing use?

A

electromagnetic

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8
Q

Active Systems in Remote Sensing?
What does it require?
What is an advantage of this?

A

Systems which generate their own energy,

  • needs to have ability to emit energy source and record the return of a signal
  • advantage is that its not restricted to time when an outside energy source is available.
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9
Q

Examples of Active Systems? 4

A
  • LIDAR
  • RADAR
  • SONAR
  • SEISMIC
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10
Q

Explain Passive Systems in Remote Sensing?

whats the most commonly used energy source?

  • what does its image resemble
A
  • rely on outside sources of energy
  • most common sensors available
  • most common energy source is the sun
  • resembles closely to what the human eye can see.
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11
Q

Examples of Passive Remote sensing?

A

Aerial Photography, Multispectral Scanners

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12
Q

What wavelengths do thermal sensors use?

A

10 micrometers

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13
Q

What energy does multispectral scanners use?

What type of remote sensing are they?

A
  • uses blue (450) to the middle infrared (2500nm)
  • light reflected of earths surface
  • Passive type
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14
Q

What are the 4 interconnected disciplines in Remote Sensing?

A
  • aerial photography
  • image interpretation
  • photogrammetry
  • image processing
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