Which factor does not influence chart convergence in Lambert charts?

In the context of Lambert charts, chart convergence refers to the angular difference between true north and grid north on a chart. This phenomenon occurs due to the projection used, where the Earth's surface is represented on a flat plane.

The latitude of the parallel of origin plays a significant role in determining the convergence, as the curvature of the Earth and the angle at which lines of latitude are projected impact how grid lines are drawn.

Longitude differences are also crucial because they help establish the spacing and angular relationships between grid lines as they converge toward the poles in a cylindrical projection.

Distance between two positions is relevant as it can affect the amount of convergence experienced, since as one moves farther from the parallel of origin, the difference in angle between true north and the grid north can become more pronounced.

In contrast, the elevation of the terrain does not affect chart convergence on Lambert charts. Convergence is purely a function of the chart's projection and geographic coordinates, rather than the physical elevation of the terrain above sea level. Therefore, elevation does not influence the angular relationship between true and grid north, making it the correct choice.