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Characteristics of Remotely Sensed Data

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Questions and Answers

What determines the spectral resolution in an image?

The range of brightness values in the image pixels
The radiometric resolution expressed in bits
The frequency of the sensor visiting the location
The number of spectral bands and their division (correct)

What characterizes hyperspectral sensors in terms of spectral bands?

They contain more than 200 spectral bands with narrow divisions (correct)
They capture a low number of spectral bands
They typically range between 4 to 15 spectral bands
They have a wide division of the electromagnetic spectrum

How are digital numbers (DN) expressed in images?

By the number of spectral bands captured
Through brightness values in the image pixels
Through a binary series known as bits (correct)
By the radiometric resolution expressed in bits

What does radiometric resolution impact in images?

Ability to separate Earth's objects based on brightness differences (C) Signup and view all the answers

How are positional and feature accuracies related to remote sensing images?

Positonal accuracy depends on spatial resolution, feature accuracy on other resolutions (A) Signup and view all the answers

What does a high spectral resolution image contain?

A large number of spectral bands with fine division of the electromagnetic spectrum (C) Signup and view all the answers

How are radiometric resolutions expressed in images?

In terms of the brightness values or digital numbers (DN) (B) Signup and view all the answers

What determines the temporal resolution in remote sensing?

The frequency of obtaining images over the same area (C) Signup and view all the answers

What is essential for remote sensing applications covering small areas?

High positional and feature accuracies (D) Signup and view all the answers

How is feature accuracy influenced in remote sensing analysis?

By spatial, spectral, radiometric, and temporal resolutions (B) Signup and view all the answers