Lecture 1: Introduction to Remote Sensing

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What is the primary characteristic of remote sensing?

Involves physical contact with the object

Limited to small-scale data acquisition

Only used for studying social sciences

Involves the use of recording or real-time sensing devices (correct)

What is the role of a sensor in remote sensing?

To physically interact with the object

To collect information about an object or phenomenon within its field-of-view (correct)

To interpret the results

To process the data after collection

What is the advantage of using remote sensing for monitoring earth and environment?

It provides time series of data (correct)

It provides only historical data

It is not updated regularly

It is limited to small areas

What is a benefit of remote sensing in terms of accessibility?

It can make inaccessible areas visible Signup and view all the answers

What is a characteristic of remote sensing data?

It provides more information than human knowledge Signup and view all the answers

What is the platform for a remote sensing instrument?

Suborbital or satellite platform Signup and view all the answers

What is the primary application of remote sensing-derived information?

Modeling natural and cultural processes Signup and view all the answers

What determines the area on the Earth's surface which is 'seen' from a given altitude at one particular moment in time?

Instantaneous Field of View (IFOV) Signup and view all the answers

What is the term for the smallest units of an image?

Pixels Signup and view all the answers

What is the relationship between scale and actual ground distance?

Scale is the ratio of distance on an image to actual ground distance Signup and view all the answers

What is the spatial domain in remote sensing?

The spatial scale of observations being collected Signup and view all the answers

What is the term for the smallest possible feature that can be detected by a remote sensor?

Spatial resolution Signup and view all the answers

What happens to the energy when it hits a rough surface?

It is reflected uniformly in all directions Signup and view all the answers

What is the main characteristic of an image in remote sensing?

It is a representation of electromagnetic energy Signup and view all the answers

Why is remote sensing considered unobtrusive?

It does not disturb the object or area of interest Signup and view all the answers

What is the advantage of remote sensing in terms of data collection?

It can collect data systematically, removing sampling bias Signup and view all the answers

What is one type of biophysical information that remote sensing can provide?

X, y location, and z elevation or depth Signup and view all the answers

Why is chlorophyll important in remote sensing?

It strongly absorbs radiation in the red and blue wavelengths Signup and view all the answers

What is the primary factor that determines the spatial resolution of an image?

The size of the pixels relative to the objects in the image Signup and view all the answers

What is the purpose of combining individual bands in a multispectral image?

To bring out particular details on the surface Signup and view all the answers

Which of the following has a coarse spectral resolution?

Black and white film Signup and view all the answers

What is the result of finer spectral resolution in an imaging sensor?

Narrower wavelength range for a particular band Signup and view all the answers

What is the primary advantage of using a multispectral image over a single-band image?

Ability to distinguish between materials with similar spectral signatures Signup and view all the answers

What is the relationship between the spectral resolution of an imaging sensor and its ability to distinguish between materials?

Finer spectral resolution results in better material distinguishability Signup and view all the answers

What are the points called in the geometric registration process that are used to match the distorted image to its true positions?

Ground control points Signup and view all the answers

What is the purpose of resampling in the geometric registration process?

To determine the digital values for the new pixel locations Signup and view all the answers

What type of resampling method uses a weighted average of four pixels in the original image?

Bilinear interpolation Signup and view all the answers

What are the true ground coordinates typically measured from?

A map in paper or digital format Signup and view all the answers

What is the purpose of identifying the image coordinates of ground control points?

To match the distorted image to its true positions Signup and view all the answers

What type of resampling method uses a distance weighted average of a block of sixteen pixels from the original image?

Cubic convolution Signup and view all the answers