For a first-order geodetic control network, what is the minimum triangulation station spacing?

For a first-order geodetic control network, what is the minimum triangulation station spacing?

• A. 10.00 km
• B. 15.00 km
• C. 0.50 km
• D. 5.00 km

Answer: (B)

In a first-order geodetic control network, the spacing between triangulation stations is chosen to keep the network geometry well conditioned while keeping field work practical. Angles are measured with fixed precision, and base lengths are determined with high accuracy; if stations are spaced too closely, you don’t gain much in accuracy but you waste effort, while if they’re spaced too far apart, the geometry becomes fragile and small measurement errors can cause large position errors when the network is adjusted. About 15 kilometers as a minimum spacing hits a practical balance. It is far enough apart to ensure the triangles provide stable geometry and meaningful redundancy, yet close enough to keep angle observations effective and closure checks reliable. Spacing much smaller (and thus more stations) adds cost without proportional gains in accuracy, while larger spacing would degrade the network’s reliability. That’s why 15.00 km is the typical minimum used for first-order triangulation networks.

In a first-order geodetic control network, the spacing between triangulation stations is chosen to keep the network geometry well conditioned while keeping field work practical. Angles are measured with fixed precision, and base lengths are determined with high accuracy; if stations are spaced too closely, you don’t gain much in accuracy but you waste effort, while if they’re spaced too far apart, the geometry becomes fragile and small measurement errors can cause large position errors when the network is adjusted.

About 15 kilometers as a minimum spacing hits a practical balance. It is far enough apart to ensure the triangles provide stable geometry and meaningful redundancy, yet close enough to keep angle observations effective and closure checks reliable. Spacing much smaller (and thus more stations) adds cost without proportional gains in accuracy, while larger spacing would degrade the network’s reliability. That’s why 15.00 km is the typical minimum used for first-order triangulation networks.