Classification basis: Are perspective drawings classified by the number of ground lines, or by another criterion used in design graphics standards?

Introduction / Context:
Understanding how perspective drawings are classified is essential for correctly setting up views. The statement suggests classification based on the number of ground lines; in practice, classification relies on the count of vanishing points.

Given Data / Assumptions:

• Perspective categories: one-point, two-point, and three-point.
• Ground line is a construction element where the picture plane meets the ground plane.
• Vanishing points are determined by sets of parallel edges not parallel to the picture plane.

Concept / Approach:
The key determinant is how many directions in the object are not parallel to the picture plane and thus recede to vanishing points. With one such direction, it is one-point; with two, it is two-point (angular); with three (including vertical convergence), it is three-point. The ground line helps organize height and depth constructions but is not the classification basis.

Step-by-Step Solution:
Identify that the classification is by vanishing points (1, 2, or 3).Note that the number of ground lines remains one, as it is the intersection of ground and picture planes.Therefore, the claim that classification uses ground lines is incorrect.

Verification / Alternative check:
Standard drafting texts and visualization courses explicitly organize perspective topics by the count and placement of vanishing points, not by ground-line count.

Why Other Options Are Wrong:
Limiting the rule to landscape or architectural contexts still does not make ground lines the classifier; those disciplines also use vanishing points.

Common Pitfalls:
Confusing construction aids (ground line, station point, picture plane) with classification criteria (vanishing points).

Final Answer:
Incorrect