List of top Geomatics Questions asked in GATE GE

Principal Component Analysis is performed on a 4-band IRS satellite image. The eigenvalues $ \mathbf{E} = [\lambda_{1,1}, \lambda_{2,2}, \lambda_{3,3}, \lambda_{4,4}] $ computed from the covariance matrix are 887.60, 75.20, 37.60 and 6.73, respectively. The percentage of total variance explained by the third principal component ($ \lambda_{3,3} $) is_______________(rounded off to 2 decimal places).}

The histogram of a red band in a 3-bit satellite image is shown below. Which of the following statements is/are correct?

For the correlation matrix of a 4-band satellite image as shown below, which of the following statements is/are correct?

	Band 1	Band 2	Band 3	Band 4
Band 1	1	0.95	0.36	0.92
Band 2	0.95	1	0.40	0.93
Band 3	0.36	0.40	1	0.42
Band 4	0.92	0.93	0.42	1

Principal Component Analysis is performed on a 4-band IRS satellite image. The eigenvalues $ \mathbf{E} = [\lambda_{1,1}, \lambda_{2,2}, \lambda_{3,3}, \lambda_{4,4}] $ computed from the covariance matrix are 887.60, 75.20, 37.60 and 6.73, respectively. The percentage of total variance explained by the third principal component ($ \lambda_{3,3} $) is __________ (rounded off to 2 decimal places).

Which of the following conditions is/are essential for geostationary satellite orbits?

A country has 7 permanent Global Navigation Satellite System stations covering its territory. Their surveying organization generates a network solution after applying double differencing to the observations. These 7 permanent stations can view 5 to 10 common satellites at any given epoch. What is the range (minimum, maximum) of the number of independent double differenced observables possible?

In the choke ring antenna there are concentric cylinders placed around the antenna that are of a certain depth to minimize the multipath effect. If the signal wavelength is $ \lambda $, then the depth of the cylinders in the choke ring antenna should be

In the context of Global Navigation Satellite System positioning, which of the following statement is correct?

In the context of Global Navigation Satellite System positioning, the Saastamoinen model provides a correction for ____________

Which one of the following techniques is NOT used to atmospherically correct the satellite image?

The geophysical variables that can be measured/derived from the Global Navigation Satellite System observations is/are

The FOV of a sensor (for a scene) placed at a nadir height of 6 km is 90 degree. The ground swath width of the scene is __________________ km (in integer).

Spinning of the Earth, as viewed from the North pole, appears to be from

Survey of India topographic sheet is 53G/12. At this scale, the number of toposheets that would cover a land area equivalent to 4 degree by 4 degree is __________________ (in integer).

Select the INCORRECT statement:

In a closed traverse, the sum of the latitudes is 1.39 m and the sum of the departures is 2.17 m. The Length and Whole Circle Bearing of the closing error are

Choose the CORRECT statement(s).

The multiplying constant of a Tacheometer, where $ f $ is the focal length and $ i $ is the distance between the stadia hairs, is

The main principle of Surveying is to work from

If a 1:50,000 scale map is digitized to an accuracy of ± 0.5 mm, the level of error that might be expected in ground is ± __________________ m (in integer).

Departure of a line of a traverse is obtained by multiplying its length by the __________________ of the reduced bearing of the line.

The type of survey carried out to define the property boundaries for transfer of land property is called

Centroid of a polygon is

The area of a buffer of 50 m around a proposed 1 km straight road segment to restrict any future construction is __________________ sq. m. (in integer). (Take the value of $\pi = 3.14$)

The internal angles P, Q, R of a triangle are observed in degree minute second (° ' "). The angles along with their probable errors are given below.
P = 40° 30' 01'' ± 02'', Q = 60° 00' 02'' ± 03'', R = 79° 30' 05'' ± 04''
The corrected values of the angles P, Q and R are