Abschlussquiz

Beyond the Visible – Einführung in die Hyperspektrale Fernerkundung

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1 Willkommen!

2 Topics
1. 1.1 Hyperspektral, na und?
2. 1.2 EnMAP – Die deutsche Hyperspektral-Satellitenmission
2 Einstiegstest: Bereit für die hyperspektrale Fernerkundung?

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3 Grundlagen der abbildenden Spektroskopie

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4 Grundlagen der Sensortechnologien und Datenerfassungstechniken

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5 Praktisches Training: Daten und Software

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6 Auf Wiedersehen!

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Question 1 of 15

1. Question

Sort the wavelength ranges from short to long wavelengths

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Question 2 of 15

2. Question

Can you identify some advantages of imaging spectroscopy data? (multiple-choice)

The data contains a high level of spectral detail
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The data allow for the retrieval of a range of different surface variables
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Analysis is much faster and easier compared to other types of remote sensing data
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Question 3 of 15

3. Question

Remember the basic laws of radiation – which of the statements below is correct? (multiple-choice)

All objects > 0 K emit radiant energy
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Hotter objects radiate more total energy per unit area than colder objects
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The hotter the radiant body, the shorter the wavelength of maximum radiation
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Perfect absorbers (perfect emitters) are called black holes
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Question 4 of 15

4. Question

Which surface material has usually the lowest reflectance in the SWIR: (single-choice)

Clear water
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Snow
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Dry vegetation
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Open soil
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Question 5 of 15

5. Question

Which preprocessing steps should not be applied to hyperspectral data? (single-choice)

Cosmetic correction
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Geometric correction
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Atmospheric correction
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Radiometric correction
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Question 6 of 15

6. Question

What is a radiometric correction and what does it do? (multiple-choice)

It transforms digital numbers to radiance
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It transforms digital numbers to reflectance
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It involves data resampling using nearest neighbor, bilinear interpolation or cubic convolution methods
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It involves a linear transformation in which correction coefficients (gain and offset) are applied to every image pixel
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Question 7 of 15

7. Question

Why can it be useful to apply dimensionality reduction before or as part of actual image analysis? (multiple-choice)

Because the human brain has difficulties with more than three dimensions
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Because it can speed-up processing and reduce computational costs
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Because hyperspectral data are often highly redundant and carry highly inter-correlated information
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Because redundant data introduce noise and may lead to suboptimal model performances
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Question 8 of 15

8. Question

You have learned about different data resources in this course. Assing the following resources into the four categories (Fill in the blank)

Options: spaceborne (2x), airborne (2x), spectral library (2x)

EnMAP campaign portal BLANK 1 of 6

USGS EarthExplorer BLANK 2 of 6

PRISMA data portal BLANK 3 of 6

AVIRIS NG BLANK 4 of 6

Specchio BLANK 5 of 6

ECOSTRESS BLANK 6 of 6

EnMAP campaign portal Fill in the blank 1 of 6

USGS EarthExplorer Fill in the blank 2 of 6

PRISMA data portal Fill in the blank 3 of 6

AVIRIS NG Fill in the blank 4 of 6

Specchio Fill in the blank 5 of 6

ECOSTRESS Fill in the blank 6 of 6

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Question 9 of 15

9. Question

Which effect relates to spectral non-uniformities? (single-choice)

The so-called „keystone“ effect
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The so-called „smile“ effect
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Question 10 of 15

10. Question

What is a so-called spectral “endmember” in remote sensing? (single-choice)

a target or spectrum with a very low reflectance
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the last target or spectrum in a spectral library
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a target or spectrum of very high purity
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an unknown target or spectrum
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Question 11 of 15

11. Question

What is the correct abbreviation of bi-directional reflectance distribution function? (single-choice)

BRF
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BDRF
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BRDF
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BDRDF
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Question 12 of 15

12. Question

Which factors influence the reflectance of vegetation? (multiple-choice)

Moisture content
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Species
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Phenology
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Health
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Question 13 of 15

13. Question

What is a Lambertian surface? (single-choice)

An ideal specular reflector
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An ideal diffuse reflector
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A calibration target
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A perfect emitter
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Question 14 of 15

14. Question

Which region of occuring absorption features is due to “vibrational processes” and which due to “electronic processes”?

Sort elements

Vibrational bands (e.g. bound or unbound water (H2O, OH-) and CO)
Distinct electronic processes (e.g. Fe-bands)

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B	Correct Incorrect Correct answer

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Question 15 of 15

15. Question

Assign the correct categories to the following spectra

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Open soil
Bright mineral (calcite)
Green vegetation
Clear water

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B	Correct Incorrect Correct answer

C	Correct Incorrect Correct answer

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Beyond the Visible – Einführung in die Hyperspektrale Fernerkundung

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