List of top Geomatics Questions on Satellite Communications

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?
 

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).

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