How would you design a geodetic control network for a major infrastructure project?

Network design approach: define accuracy requirements based on project scale (primary control +-10mm, secondary +-20mm). Select reference frame (WGS84 or local datum). Plan monument locations considering stability, intervisibility, and coverage. Conduct reconnaissance to verify site suitability. Design observation scheme with redundancy - GPS baselines with good geometry, or triangulation with well-conditioned triangles. Pre-analysis simulation predicts achievable accuracy. Observation plan specifies sessions, durations, and equipment. Data processing uses rigorous least squares adjustment with variance component estimation. Network connects to national datum for consistency.