List of top Geomatics Questions

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 1Band 2Band 3Band 4
Band 110.950.360.92
Band 20.9510.400.93
Band 30.360.4010.42
Band 40.920.930.421

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