List of top Remote Sensing Questions asked in GATE Geomatics Engineering

Consider an imaging system with 128×128 pixels that produces a noiseless, distortion-free digital image. It is used to digitize checkerboard patterns where all squares of the pattern are in the field of view. Using this imaging system, if a checkerboard pattern with 128×128 squares is digitized, each square will be 1×1 pixel in size. What is the size of the checkerboard square in the generated digital image for which spatial aliasing is observed (measured in pixels of the imaging system)?

Energy carried by a part of short-wave infrared ray at 1000 nm wavelength is __________ eV (rounded off to 2 decimal places). \[ h = 6.626 \times 10^{-34}\ {Js}, \quad 1\ {J} = 6.242 \times 10^{18}\ {eV}, \quad c = 3 \times 10^8\ {ms}^{-1} \]

If the radiant temperature of a body is 360 K and its emissivity is 0.6, then the kinetic temperature of that body is _______ K (Answer in integer).}

Consider the three input raster images given below. A geospatial analyst decided to use the overlay operation to generate a new raster showing the average values. The values of the cells P, Q, and R in the output raster are:
Input raster
 

523
122
311

→

132
475
111

→

341
432
211


Output raster

 

PQR
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Find the best match between column I and column II for the following scenario related to spatial operators. 

If the emissivity of an object varies with wavelength, it is called as __________

If the absolute temperature (greater than 0 K) of a body is doubled, it would emit \underline{{2cm} times more radiation.}