List of top Geomatics Engineering Questions

A 23 cm square format camera with a focal length of 152.4 mm is used for taking vertical aerial photographs with 60% end-lap. These photographs are viewed under a stereoscope with a base-height ratio of 0.15. The vertical exaggeration while stereoviewing these photographs is ___________ (Answer in integer).

In a map based on the UTM projection, the grid distance is in error with respect to the geodetic distance by about one in four thousand. If the map distance is 3 cm and the map scale is 1:25,000, then the geodetic distance is ___________m (rounded off to 2 decimal places).

Consider an infinitely sized square grid pattern (as shown in the figure below) overlaid on a flat ground at an elevation of 120 m above mean sea level. An image is taken by a camera from flying height of 450 m above mean sea level. Assume that the flying height remains constant throughout the operation of the flight. The flying direction is along the line FL, as shown in the figure below. The camera is looking in the off-nadir in the flight direction resulting in a low oblique photograph. Which of the following statements for the resulting low oblique photograph is/are correct? 

Consider a pair of overlapping vertical aerial photographs taken from a flying height of 665 m above a point A on the ground, with a camera having a focal length of 152.4 mm. The height of the point A above the mean sea level is 535 m. The parallax bar reading of the point A as measured from the photographs is 10.96 mm. Assuming the air base to be 400 m, the parallax bar constant is _________ mm.

Select the correct statement in the context of relief displacement in vertical aerial photographs.
Which one of the following parameters does NOT affect the scale of a vertical aerial photograph?

In a Survey of India topographic map of scale 1:50,000, the contours are drawn conventionally at intervals of __________ m.

Which one of the following map projections is NOT conformal?
In a Geographic Information System database, a stream is represented by a line and houses are represented by polygons. The pollution in the stream is affecting houses within a distance of 500 m on both sides. Which vector data analysis operations should be performed to identify houses affected by the pollution in the stream?
Which one of the following statements is NOT correct in the context of shapefile?
Given the following values, calculate the required properties: \[ S = 0.67, \quad e = 0.6, \quad w = 0.15, \quad G = 2.67, \quad \gamma_w = 9.81 \, \text{kN/m}^3, \quad V = 5 \, \text{m}^3 \]
To reduce the slope distance (S) to an equivalent horizontal distance (H) as shown in the figure given below, the following independent observations were taken.
\(S = 29.95 m ± 0.01 m; \theta = 4°30' ± 10' \)
The required precision of computed horizontal distance is ± 0.005 m. Assume a "balanced accuracy" where the contribution to precision of the horizontal distance comes equally from the slope distance and angle measurements. The minimum number of angle observations to achieve the desired precision is 
(Given 1 radian = 206265 seconds) 
To reduce the slope distance (S) to an equivalent horizontal distance (H) as shown in the figure given below, the following independent observations were taken.
What is the CORRECT match between the survey instruments/parts of instruments shown in the table and the operations carried out with them ?
Instruments/Parts of instrumentsOperations
PBubble tubeiTacheometry
QPlumb bobiiMinor movements
RTangent screwiiiCentering
SStadia cross-wireivLevelling
In tangential method of tacheometry, two vanes in a staff were fixed at a distance of 1.0 m with the bottom vane fixed at 1.0 m. The levelling staff was held vertical at a point P and the vertical angles of the vanes observed were 5°30′ and 3°15', respectively. The vertical distance between the instrument axis and the bottom vane would be _______ m (rounded off to two decimal places).
The standard error of a unit weight for a set of angle observations is 10". The minimum number of observations required to reduce the standard error of the mean for this set of observations to 2" is ______ (in integer).
Using the given 3 × 3 pixel kernel and original image and applying the concept of convolution, the value of central pixel of the output image is _____ (in integer).
Using the given 3 × 3 pixel kernel and original image and applying the concept of convolution, the value of central pixel of the output image is _____ (in integer).
Using the following data, the spatial resolution of a push-broom sensor is _________ m (in integer). 
Data: 
Orbital altitude (above earth surface) = 1000 km 
Number of spectral bands = 5 
Number of detectors/CCDs (charged coupled devices) in a row = 4000 
Ground swath = 20 km
A map is prepared with a scale of 1:1000 and a contour interval of 1 m. If the distance between two adjacent contours on the map is 10 mm, the slope of the ground between the adjacent contours is
A high tower appeared on an aerial photograph taken at 1000 m above mean sea level with a camera lens of 15 cm focal length. The radial distances of the top and bottom images of the tower from principal point of photograph are 92.6 mm and 78.3 mm, respectively. If the average elevation of terrain is 300 m above mean sea level, then the height of the tower above ground is _________ m (rounded off to the nearest integer).
A four-band multispectral image with pixel size of 50 m x 50 m covers a ground area of 20 km × 20 km. If the radiometric resolution of the satellite data is 8 bits, then the uncompressed satellite image contains _______ kilobytes (kB) of data (in integer).
The magnetic bearing of a line in the year 1990 was found to be N 40°30' W and magnetic declination was 3°30′ E. If the present magnetic declination is 2°10′ W, the magnetic bearing now (in reduced bearing system) would be
A surveyor observes a zenith angle of 93° 00' 00" during a theodolite survey. The corresponding vertical angle is
If the plotting accuracy of a map is 0.25 mm and the scale of the same map is 1:100000, what will be the minimum ground distance that can be plotted on the map?
Independent angles AOB, BOC and AOC were observed as shown in figure. The standard error of all observations is same. The adjusted values of these angles using the least squares adjustment are
Independent angles AOB, BOC and AOC were observed
If the number of sides resulting in a closed traverse is increased from three to four, the sum of the interior angles increases by