NetCDF

General Aspects

Purpose of these BAWiki Pages

These BAWiki pages do describe all NetCDF conventions required to store baw-specific data in NetCDF data files (see network common data form). I. e. all local conventions are listed, which go beyond the international agreed-upon CF-metadata convention. These pages are also meant as a discussion ground for agreeing on those additional conventions required.

In cases where the international agreed-upon conventions are insufficient, one should first check whether extensions described in Deltares-Conventions can be used or not - it is recommended to discuss further required extensions with Deltares.

The additional conventions should be listed in the global NetCDF attribute Conventions, e. g. in the following way:

// global attributes:

:Conventions = "CF-1.4/Deltares-0.1/BAW-0.1" .

Global Attributes

• NetCDF global attributes

Grids

• NetCDF multiple locations: several (point) locations, e. g. equivalent to contents of file location_grid.dat;
• NetCDF multiple profiles: several longitudinal and cross-sectional profiles, e. g. equivalent to contents of file profil05.bin;
• NetCDF triangular grid: triangular grid, e. g. equivalent to contents of file gitter05.dat and gitter05.bin;
• NetCDF unstructured grid: unstructured grid, e. g. equivalent to contents of file untrim_grid.dat;
• NetCDF unstructured grid with subgrid: unstructured grid with additional subgrid data, e. g. equivalent to contents of file utrsub_grid.dat.

Time Coordinate

• NetCDF time coordinate: date and time, calendar.

Vertical Coordinate

• NetCDF vertical coordinate: dimensional vertical coordinate (height, depth).

Horizontal Coordinate Reference System

• NetCDF grid mapping variable

Reduction of Dataset Size

• NetCDF packed data, and
• NetCDF compression by gathering.

Data

Synoptic Data

• NetCDF synoptic data at multiple locations,
• NetCDF synoptic data for multiple profiles,
• NetCDF cross section integral data for multiple profiles,
• NetCDF synoptic data for triangular grid,
• NetCDF synoptic data for unstructured grid, and
• NetCDF synoptic data for unstructured grid with subgrid.

Analysis Data

• NetCDF tidal characteristic numbers of water level, and
• NetCDF differences for tidal characteristic numbers of water level.

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