Chpter1 Flashcards
(16 cards)
What hydrographic
Hydrography is the science of measuring and mapping water bodies. It studies the shape, depth, and features of the seabed and its connection to the land.
Coastal hydrography
is concerned with the development of
ports and harbours and safety of navigation in coastal waters.
Off-shore hydrography
is concerned with (a) the provision of
hydrographic data as an extension of the coastal zone and (b) the development of
mineral deposits and (c) provision of
data for fisheries management.
Oceanic hydrography
concerned with the acquisition of
hydrographic data in the deep ocean areas for the depiction of
sea-floor geomorphology.
Data acquisition
Depth and position of seafloor and hazards
Bottom type (sub-bottom info)
Sound Velocity Profile, Tides, currents
Shoreline, navigational aids
Data Production
bathymetric maps, sounding maps, contouring
maps, digital paper charts (raster nautical charts) and electronic
nautical charts products)
Data management
standards for data formats, data storing,
manipulation MSDIs
Data visualization
2-dimensinal vs. 3-dimensional data visualization,
dynamic models, multi-dimensional visualization and digital
elevation models
TYPES (FORMAT) OF HYDROGRAPHIC DATA
PRODUCTS
• Mostly spatial data format
• Vector data format
• Raster data format
• Digital Elevation Models (DEMs)
THREE MAJOR USER GROUPS
- Marine transportation
- Coastal zone management
- Exploration and exploitation of undersea
resources
Data and metadata
Data is the actual information we measure or record, while metadata describes that information
Order 2
Deep-water areas needing general seabed depiction
Order 1b
Areas less than 100m depth, where under-keel clearance is not critical
Order 1a
Coastal waters, harbors, and channels with potential seabed concerns
Special order
Critical under-keel clearance areas (e.g., berthing areas)
Exclusive order
Exceptional shallow areas with hazardous seabed
