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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