Abschlussquiz

Sort the wavelength ranges from short to long wavelengths

VIS
MIR
NIR
TIR
Microwaves
SWIR
UV

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

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

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

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

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

Clear water
Snow
Dry vegetation
Open soil

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

Cosmetic correction
Geometric correction
Atmospheric correction
Radiometric correction

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

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

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
Because it can speed-up processing and reduce computational costs
Because hyperspectral data are often highly redundant and carry highly inter-correlated information
Because redundant data introduce noise and may lead to suboptimal model performances

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

USGS EarthExplorer

PRISMA data portal

AVIRIS NG

Specchio

ECOSTRESS

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

The so-called „keystone“ effect
The so-called „smile“ effect

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

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

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

BRF
BDRF
BRDF
BDRDF

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

Moisture content
Species
Phenology
Health

What is a Lambertian surface? (single-choice)

An ideal specular reflector
An ideal diffuse reflector
A calibration target
A perfect emitter

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)

A
B

Assign the correct categories to the following spectra

Sort elements

Open soil
Bright mineral (calcite)
Green vegetation
Clear water

A
B
C
D

Beyond the Visible – Einführung in die Hyperspektrale Fernerkundung

HYPERedu

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