Chapter 2 · MCQ Read Mode

Photogrammetry, Remote Sensing and Image Processing

Photogrammetry is best defined as obtaining reliable information about objects by:

A photograph is a:

The condition that the image point, the perspective centre and the object point lie on one straight line is called:

Three-dimensional information is obtained in photogrammetry from:

Close-range photogrammetry with the camera on the ground is called:

Photogrammetry that deals with identification of objects rather than measurement is called:

The 'father of photogrammetry' is considered to be:

The analytical plotter, which linked a computer to the measuring system, was introduced by:

Which of the following is an advantage of photogrammetric mapping?

A serious limitation of aerial photogrammetry is that:

Structure from motion (SfM) is associated mainly with:

Photogrammetric measurement of stockpile or quarry volumes is an example of:

In Nepal, UAV photogrammetric flights additionally require:

An aerial photograph is classified as vertical when the tilt of the camera axis is less than about:

A high oblique aerial photograph is one in which:

The scale of a vertical photograph taken with f = 150 mm from a height of 1 500 m above the ground is:

The scale of a single vertical photograph over undulating ground:

The usual forward (end) overlap in aerial photography for mapping is:

Relief displacement on a vertical photograph is radial from the:

The relief displacement of a point is given by:

Removing y-parallax from a stereo pair is the purpose of:

Absolute orientation of a stereo model involves:

The number of elements of exterior orientation of a photograph is:

Aerial triangulation is carried out mainly to:

An orthophoto differs from a rectified photograph because it also removes:

Marking ground control points with targets before the photographic flight is called:

The average eye base (interpupillary distance) of an adult is about:

Stereoscopic depth perception is possible because the two eyes:

Reversed relief, in which hills appear as valleys, is called:

Anaglyph viewing of a stereo model uses:

The x-parallax of a point on a stereo pair:

The presence of y-parallax in a stereo model indicates:

The instrument used with a mirror stereoscope to measure parallax differences is the:

For a vertical stereo pair, the height of a point is given by:

Vertical exaggeration in a stereo model means that:

In digital photogrammetry, image pyramids are used to:

Area-based image matching typically fails on:

SIFT, Harris and Förstner operators are used in:

The epipolar constraint is useful in image matching because it:

Remote sensing is defined as acquiring information about an object:

The first civilian earth-resources satellite, launched in 1972, was:

The visible portion of the electromagnetic spectrum lies between:

Rayleigh scattering is inversely proportional to:

Clouds appear white in optical imagery because of:

Wavelength regions in which the atmosphere transmits radiation well are called:

Healthy green vegetation shows very high reflectance in the:

Clear water bodies are easiest to delineate using the:

NDVI is computed as:

A sensor that supplies its own energy, such as radar, is called:

Meteorological satellites that remain over the same point on the equator are in a:

The number of brightness levels that a sensor can record is its:

A sensor recording hundreds of narrow contiguous bands is called:

Dark-object subtraction is a simple method of:

Which resampling method preserves the original digital numbers of an image?

Geometric correction of a satellite image using ground control points requires the RMSE to be, typically:

Ortho-rectification differs from simple geometric correction because it also removes:

Histogram equalisation is used to:

A median filter is most useful for removing:

High-pass filtering of an image enhances:

In a standard false-colour composite, healthy vegetation appears:

Principal component analysis of a multispectral image is used mainly to:

K-means and ISODATA are algorithms of:

The most commonly used statistical decision rule in supervised classification is:

In an error matrix, the user's accuracy of a class is related to the error of:

The kappa coefficient of a classification measures:

A digital surface model (DSM) represents:

Subtracting a DTM from a DSM gives:

The advantage of a TIN over a regular grid DEM is that it:

Airborne LiDAR can produce a bare-earth DTM under forest because:

The typical vertical accuracy of airborne LiDAR is of the order of:

The horizontal accuracy achievable by UAV photogrammetry with good ground control is usually about:

Radar remote sensing is valuable in the monsoon season because it:

In SAR imagery, steep slopes facing the sensor that appear compressed exhibit:

Speckle in radar images is:

Radar backscatter from a smooth water surface is:

InSAR generates a DEM from:

Differential InSAR (DInSAR) is used mainly to measure:

A true orthophoto differs from an ordinary orthophoto because it: