A netCDF file that has not yet been opened can only be referred to by its file name. The operations supported on a netCDF file as a single object are:
Best Practices Conventions While netCDF is intended for "self-documenting data", it is often necessary for data writers and readers to agree upon attribute conventions and representations for discipline-specific data structures.
These agreements are written up as human readable documents called netCDF conventions. Use an existing Convention if possible.
See the list of registered conventions. The CF Conventions are recommended where applicable, especially for gridded model datasets. Document the convention you are using by adding the global attribute "Conventions" to each netCDF file, for example: This document refers to conventions for the netCDF classic data model.
Coordinate Systems A coordinate variable is a one-dimensional variable with the same name as a dimension, which names the coordinate values of the dimension. A two-dimensional variable of type char is a string-valued coordinate variable if it has the same name as its first dimension, e.
Coordinates that refer to physical space are called spatial coordinates, ones that refer to physical time are called time coordinates, ones that refer to either physical space or time are called spatio-temporal coordinates.
Make coordinate variables for every dimension possible except for string length dimensions. Use an existing netCDF Convention for your coordinate variables, especially to identify spatio-temporal coordinates.
Use shared dimensions to indicate that two variables use the same coordinates along that dimension.
Variable Grouping You may structure the data in a netCDF file in different ways, for example putting related parameters into a single variable by adding an extra dimension. Standard visualization and analysis software may have trouble breaking that data out, however. On the other extreme, it is possible to create different variables e.
However, standard visualization and analysis software may have trouble grouping that data back together. Here are some guidelines for deciding how to group your data into variables: All of the data in a variable must be of the same type and should have the same units of measurement.
If possible, all of the coordinate variables should be spatio-temporal, with no extra dimensions. Use 4D spatio-temporal coordinate systems in preference to 3D. Use 3D spatio-temporal coordinate systems in preference to 2D.
There are trade-offs between putting vectors in the same variables vs. Check that any visualization software you plan to use can deal with the structure you choose. Think in terms of complete coordinate systems especially spatio-temporaland organize your data into variables accordingly.
Variables with the same coordinate system implicitly form a group.Export to NetCDF Files MATLAB NetCDF Capabilities Network Common Data Form (NetCDF) is a set of software libraries and machine-independent data formats that support the creation, access, and sharing of array-oriented scientific data.
Definition of attribute for Students: a quality belonging to a particular person or thing Patience is a good attribute for a teacher.
One of the definitions of the word "decimate" is to remove every tenth member of a set, It is crucial that the attribute type be consistent with the attribute value.
The NCO documentation recommends that you have define both _FillValue and missing_value, which seems like a smart idea. ncwrite(regardbouddhiste.com, 'w', w) and then use NCO to. Attributes for a netCDF file are defined when the file is first created, while the netCDF file is in define mode.
Additional attributes may be added later by reentering define mode. A netCDF attribute has a netCDF variable to which it is assigned, a name, a type, a length, and a sequence of one or more values.
Both the high-level and low-level functions now support the use of non-ASCII characters for variable names, attribute names, and attribute values. However, variable values in functions for reading and writing variables must be ASCII encoded.
I'm using Matlab to create a netCDF file with NaN values in its variables. Ideally I would like to substitute the NaNs of the Matlab variables by the default netCDF fill values when writing the netCDF.