1Definition of Hydrography
Measurement and description of physical features of bodies of water and the prediction of their changes over time
2Primary purpose of hydrographic surveying
Safe and efficient navigation
3Five-step process from measurement to decision
Measure → Reference → Process → Represent → Decide
4Question answered by horizontal control
Where is the sounding? (Defines coordinate reference framework)
5Question answered by vertical control
Relative to what level? (References water surface elevation and reduced depth)
6Seven basic operations of hydrographic surveying
Reconnaissance → Planning & preparation → Horizontal control → Vertical control → Topographic survey → Hydrographic survey → Map preparation
7Six core planning considerations
Purpose, Extent, Method, Resources, Schedule, and Risk
8First step before mobilizing a hydrographic survey crew
Reconnaissance
9Scope of topographic survey in hydrography
Mapping the adjacent land-water interface (shoreline, banks, structures, aids to navigation)
10Scope of hydrographic survey in field acquisition
Measuring the bottom and submerged features (positioning depths, detecting hazards)
11Six key components of field acquisition readiness
Platform, Positioning, Depth sensor, Ancillary sensors, Checks, and Backups
12Six steps of hydrographic data processing
Ingest → Correct → Clean → Verify → Build → Archive
13Purpose of crosslines and calibration checks
Ensuring survey data quality and consistency before demobilization