Latitude and longitude ( support_data) are one-dimensional variables of size 256, providing the necessary coordinate indices for the image array.Įncourages the use of zVariables which carry their own dimensionality. The image array ( data) maps into a two-dimensional variable with sizes 256 and 256.Flux ( data) and Energy ( support_data) are stored as one-dimensional variables of size 8. Particle flux, for this example, has values at eight energy channels.Plasma velocity, electric and magnetic fields ( data) are vectors, i.e., three orthogonal components in some coordinate system, stored in one-dimension of size 3.Density and Temperature ( data) in this example are scalars in CDF they are associated with zero dimension and no size.They are mapped to their corresponding dimensions and sizes in CDF. Metadata variables can be attached to data variables via LABL_PTR_i variable attributes (see below).Įxamples of data and support_data variables commonly found in ISTP/IACG investigations are shown below. The support_data variables can be attached to data variables via DEPEND_i variable attributes. Data variables also have attached variables for time and dependencies (support_data) and labels (metadata). Variables are defined with CDF specifications and required attributes. We have identified three types of variables to be included in ISTP/IACG CDF files: data variables of primary importance (e.g., density, magnetic_field, particle_flux), support_data variables of secondary importance (e.g., time, energy_bands associated with particle_flux) and metadata variables (e.g., a variable holding "Bx,By,Bz" to label magnetic field). 1D - sizes 28, 12 Spectrogram, e.g., H+ number flux for selected energy and angle bins.1D - size 7 Stack_plot, e.g., Electron Flux at 7 energies (0.1-225keV).1D - size 12 Spectrogram, e.g., Ion Diff.1D - size 3 Time Series, e.g., Magnetic Field, cartesian GSE.
Scalar (0D) Time Series, e.g., Solar Wind Proton Number Density, scalar.
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