List of top Geo Informatics Engineering Questions

The error matrix resulting from randomly selected test pixels for a classified image is given below.
The Producer’s accuracy of class 1 is   % (rounded off to 1 decimal place).

 Reference Data
 Class 1Class 2Class 3Class 4
Classified DataClass 1320873
Class 21227062
Class 3964105
Class 41423350

The brightness values of four pixels in the input image are shown in the table below. The image is rectified using nearest neighbor intensity interpolation, and the pixel at location (5, 4) in the output image is to be filled with the value from coordinate (5.3, 3.7) in the input image. The brightness value of the pixel at location (5, 4) in the rectified output image is 11. (Answer in integer)

Location of pixels in input image
(Row, Column)		Brightness Value
(5, 3)9
(5, 4)11
(6, 3)14
(6, 4)12

 

In case of normalized difference vegetation index (NDVI), which of the following statements is/are correct?
A remote sensing image is acquired from an IRS series satellite. Initially a two-dimensional filter with transfer function \( H(u,v) = \exp\left(\frac{-D^2(u,v)}{2D_0^2}\right) \) is applied to reduce scan line effects. Here \( D(u,v) \) is the distance from the center of the frequency rectangle, and \( D_0 \) is the cutoff frequency. Which one of the following will be the transfer function for the corresponding filter to detect the edges in the image?

A CCD array element in a remote sensing sensor measures incoming radiation and its output voltage varies linearly between 0 V to 5 V. This voltage is converted to an 8-bit digital image using an analogue to digital convertor (ADC). The ADC has a linear response without bias or noise. If the output image pixel has a digital number of 100, the input voltage to the ADC would be __________ V (rounded off to 2 decimal places).

Clouds appear white in optical visible spectral bands of remote sensing images due to _________ scattering.

A remote sensing instrument measures only in Green, Red and Near-Infrared frequency bands. The remote sensing index/indices that CANNOT be derived using data of this instrument is/are:
Which one of the following is NOT used to assess the quality of remote sensing image?

A 4 × 4 digital image has pixel intensities (U) as shown in the figure. The number of pixels with \( U \leq 4 \) is:


 

How much time is required by GPS satellites to make one complete revolution around the Earth?
Chaining along a straight line, the leader of the party has 4 arrows in his hand while the follower has 6 arrows. Distance of the follower from the starting point is:
The maximum spectral radiant exitance from Earth features occurs at a wavelength of:
The coordinate of A is \(100m, 100m\). The coordinate of B is \(50m, 50m\). The bearing of line AB is:
The star’s hour circle coincides with the observer meridian, the star is said to be:
The orbital period of a geo-synchronous satellite is:
Plant reflectance in the range of \(0.7\) to \(1.3\) \(\mu m\) is generally caused by:
Two straight lines intersect at an angle of \(120^\circ\). The radius of the curve joining the straight lines is \(500m\). The length of the long chord and mid-ordinate in meters of the curve are:
Which of the following equipment is used to determine the sensor position in aerial and satellite-based LIDAR platforms?
(Green reflectance - SWIR reflectance) / (Green reflectance + SWIR reflectance) is known as:
In a closed traverse ABC, the following readings were taken: If station A is free from local attraction, correct bearing of CB is: 
closed traverse ABC
The constructive and destructive interference from the multiple scattering returns that occur within each resolution cell is called:
The first experimental space-borne SAR satellite is named as:
The following readings were taken on a uniformly sloping ground: \(0.500m, 1.000m, 1.500m, 2.000m, 1.200m, 1.700m, 2.200m, 2.700m\). The difference in elevation between the first and last station is:
NISAR can be expanded as:
Aerial photographs were taken with a camera having a 210-mm-square format and a 305mm focal length. The field of view of the camera is: