Final Quiz: Lesson ‘Hands-On training: Data and software’ Copy

From which sensors you currently can get data? (multiple-choice)

PRISMA

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AVIRIS NG

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EnMAP

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Hyperion

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SBG

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The EnMAP campaign portal contains datasets from target sites in which of the following countries? Please guess or check the portal. (multiple-choice)

Germany

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Spain

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USA

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Namibia

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Which preprocessing steps should be applied to hyperspectral data? (multiple-choice)

Atmospheric correction

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Radiometric correction

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Cosmetic correction

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Geometric correction

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Fill in the blank (Options: gain, offset)

Every sensor has its specific gains and offsets applied to the recorded signals. The Fill in the blank 1 of 2 is determined by measuring the closed shutter and represents the thermally induced dark current. The Fill in the blank 2 of 2 is determined by measuring the sensor’s response to a known radiance target in the laboratory.

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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Fill in the blanks, choose from: spectral non-uniformity, spatial non-uniformity, radiometric non-uniformity, temporal non-uniformity, radiometric correction, geometric correction, atmospheric correction

The smile effect is a Fill in the blank 1 of 2 that needs to be considered during Fill in the blank 2 of 2 .

What is considered in atmospheric correction? (multiple-choice)

sun position

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atmospheric state

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keystone compensation

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terrain

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

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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Because the hundreds of contiguous bands are so confusing

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In contrast to classification methods, quantification methods allow … (multiple-choice)

a direct identification of materials

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the determination of material abundances in terms of percent fractional cover

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the estimation of material contents and properties

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assignment of unique classes to each pixel

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Let’s assume you want to determine the relative abundance of known materials within each image pixel based on the materials’ spectral characteristics. Which method would you choose? (single-choice)

Spectral Mixture Analysis (SMA) or Linear Spectral Unmixing

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Spectral Angle Mapper (SAM)

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Support Vector Machine (SVM)

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Spectral Feature Fitting (SFF)

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Beyond the Visible – Einführung in die Hyperspektrale Fernerkundung

Final Quiz: Lesson ‘Hands-On training: Data and software’ Copy

Henryk Hodam

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