How is a terrain database validated for use in EGPWS and synthetic vision?

Terrain databases for safety systems require rigorous validation per DO-200A (Standards for Processing Aeronautical Data). Process: Data sourcing - SRTM, national mapping agencies, and verified survey data; accuracy specification (100m or 30m horizontal, 30m vertical typical); Resolution selection - based on application (coarser for enroute, finer for approach). Validation: Statistical sampling against independent reference data, Complete coverage verification for intended areas, Anomaly detection (spikes, voids, mismatches at tile boundaries), and Water body classification accuracy. EGPWS-specific: Validation against charted obstacle data, Approach path clearance analysis, and Alert algorithm testing with known terrain. Configuration management: Version control, Update process integrity, and Distribution chain security. Type B data quality requirements ensure data integrity. Each aircraft application (EGPWS, SVS) has specific validation requirements documented in system design assurance.