Certified Photogrammetrist Aerial Triangulation & Bundle Adjustment 2

Question 1

What is the collinearity condition in photogrammetry?

Accepted Answer

The object point, perspective center, and image point all lie on a straight line

Answer

The collinearity condition states that the object point, the camera's perspective center, and the corresponding image point are collinear—forming the mathematical basis for photogrammetric equations.

Question 2

In AT processing, what is a 'pass point'?

Accepted Answer

A point measured in consecutive photos along a flight strip to pass geometry forward

Answer

A pass point is measured in consecutive overlapping photographs along a strip to propagate (pass) the geometry from one model to the next.

Question 3

What is the effect of using too few ground control points in a large photo block?

Accepted Answer

Systematic deformations and poor absolute accuracy of the final product

Answer

Insufficient ground control allows systematic block deformations to go uncorrected, degrading the absolute accuracy of the final mapping products.

Question 4

Which accuracy metric is used to evaluate ground control point residuals after bundle adjustment?

Accepted Answer

RMSE (Root Mean Square Error)

Answer

RMSE is the standard metric for evaluating GCP residuals after bundle adjustment, summarizing the overall positional accuracy of the solution.

Question 5

What is a 'degenerate network' in aerial triangulation?

Accepted Answer

A network where all control points are collinear or poorly distributed, making the solution unstable

Answer

A degenerate network occurs when control points are poorly distributed (e.g., all collinear), creating rank-deficient normal equations and an unstable or non-unique solution.

Certified Photogrammetrist Practice Test

Certified Photogrammetrist Practice Test

Certified Photogrammetrist Aerial Triangulation & Bundle Adjustment 2