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Lecture 4 - Interaction of visible and NIR with Earth Surface Flashcards

(15 cards)

1
Q

Remote Sensing provides means for analysing soil in what ways?

A
  • Map soil aerial coverage
  • Estimate soil physiochemical properties
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2
Q

Factors affecting spectral reflectance of soil

A
  1. Soil Moisture content
  2. Organic content
  3. Structure
  4. Mineralogical composition
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3
Q

What does high soil moisture content result in for reflectance?

A

Decreased reflectance throughout visible and NIR region, especially in 1400-1900 mm water absoprtion bands.

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4
Q

Iron Oxide within soil

A

Leads to higher reflectance in red wavelength
Absorbs in blue, green and NIR wavelengths

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5
Q

What does a NIR image of water show?

A

Only contrast between water and land as water absorbs all of the light.

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6
Q

3 types of reflectance from water

A

Surface reflectance
Volume reflectance
Bottom reflectance

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7
Q

What does volume reflectance provide?

A

Info on water quality due to materials in the wateras light is reflected

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8
Q

Shallow water

A

Most reflectance is from the bottom so:
- less info about water quality
- Mapping coral reefs

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9
Q

What is used to detect presence of live coral?

A

Hyperspectral (400 wavebands) imagery

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10
Q

Surface roughness

A

Tends to decrease observed reflectance

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11
Q

Uses of surface roughness in RS

A

Pollution Mapping
Submarine topography
Wave Formation

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12
Q

Whats mainly used to measure soil moisture content?

A

Microwaves

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13
Q

How does higher soil moisture reduce reflection?

A

Water fills in airspaces so reduces the amount of scattered light and this influences the visible and NIR wavelengths and reduces their reflectance

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14
Q

Reflectance in water

A

Low reflectance in visible, NIR and SWIR, higher reflectance in blue and green.

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15
Q

Reflectance in water

A

Low reflectance in visible, NIR and SWIR, higher reflectance in blue and green.

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