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BASICS OF DATA MANAGEMENT
OTGA – UEM TRAINING COURSE –
FUNDAMENTALS OF OCEACOGRAPHIC
DATA MANAGEMENT , 23-27 JANUARY
2017, MAPUTO, MOZAMBIQUE
Prepared by: Harrison Ong’anda,
National Coordinator,
Kenya National Oceanographic Data Center (KeNODC)
[email protected], [email protected]
MARINE DATA RESOURCES
• Marine data management is a balancing act between the 3 major concepts:
• Formats,
• Software
• Data
You need to become familiar with major resources in all categories, and how
they work together. In years gone past, scientists had to go through
numerous format conversions (including writing necessary code) to make
connections.
But in recent years a small family of flexible formats, powerful computer
programs and flexible online data sources have brought everything together.
Software
•
•
•
•
Ocean Data View (https://odv.awi.de/en/software/download/)
Saga (https://sourceforge.net/projects/saga-gis/files/)
Integrated Data Viewer (http://www.unidata.ucar.edu/software/idv/)
Google Earth (https://www.google.com/earth/)
OR
• VISIT http://marinedataliteracy.org/basics/software.htm
Data Sources
• World Ocean Database/WOD
(https://www.nodc.noaa.gov/OC5/SELECT/dbsearch/dbsearch.html)
• Online data archives/mixed formats
• GHRSST (https://www.ghrsst.org/)
• Operational data
• HYCOM – (http://hycom.org/) - provides access to near real time global data
• Others, as time permits
• Gebco
(https://www.bodc.ac.uk/projects/data_management/international/gebco/gebco_digital
_atlas/)
Formats
• NetCDF – Network Common Data form
• Example: Climatological or Operational NetCDF Satellite Temp, Chloro, and Sal
Grids into Marine GIS: OceanColor Web
(https://oceancolor.gsfc.nasa.gov/cgi/l3)
• HDF
• GeoTiff
• .Shp
File Names
• You will become hopelessly lost within the short span of this course (1
or 2 weeks) and even in your own personal data collections, unless
you adopt good data management practices. We strongly
recommend the constant use of these elements:
•
•
•
•
•
•
•
parameter_
date/time_
depth/height_
location_
originator_
provider_
extras_
• Limited Characters: No spaces, no hyphens, no caps (except T),
include format in extras, if zipped
Area of Interest (AOI)
• Setting up an AOI can be based on:
•
•
•
•
Coastline
National boundaries
Relief - bathymetry and topography
Environmental factors - circulation &
ecosystems
• Anything else of concern
Defining the AOI with signed decimal degree
values
• Top latitude (not "north")
• Bottom latitude (not "south")
• Left longitude (not "west")
• Right longitude (not "east")
Making important auxiliary layers
• Graticule - lat/lon lattice
• Line and polygon frames - outer edge of AOI
• Grid templates - to control data gridding
Adding important features
• Political features
• Other coasts
Trimming shapes to the AOI to reduce filesize and speed up mapping
EXERCISE – DEFINE YOUR AOI
Recommended Exercises
• Saga Preliminary Setup
• Project Area
• Creating a Project Map in Saga
• Creating Graticules and Frames in Saga
• Creating Grid Templates in Saga
• Adding GEBCO Depth Contours to a Project Map in Saga
• Resampling Gridded Data to the Project Map Extent with a "Dummy"
Grid
• Adding Administrative Boundaries and Coastline to a Project Map in
Saga
• Adding Marine Regions to a Project Map in Saga