Which factor is not necessary to achieve good GNSS network geometry?

• A. Inter-Communication
• B. Inter-Visibility
• C. Immeasurability
• D. Immersion

Answer: (D)

The arrangement and sharing of observations determine how strong a GNSS network geometry is. When receivers have a clear view of enough satellites across the sky (inter-visibility), the network gains diverse satellite geometry, which lowers dilution of precision and improves accuracy. Likewise, the ability for stations to exchange data and be processed together (inter-communication) ensures the measurements are integrated into a consistent network solution, which is essential for reliable geometry. The notion of measurability is not something you optimize to improve geometry itself, and being physically immersed in an environment has no effect on the mathematical relationships that govern GNSS geometry. Immersion, therefore, is not a factor in achieving good GNSS network geometry.