Cdf cl full#

Cdf cl full#

A full example of a data variableĪttached via attributes to its support_data and metadata variables is shown below: The attribute DEPEND_1 (1 for dimension 1). This dependency of the data variables on the dimension is made explicit by the use of In this case, these labels also define the dimension for each of the data variables. Using the attribute LABL_PTR_1 (1 for dimension 1). In order to keep the labels distinct in CDF, they are stored in dimension 1, sizeĢ metadata variables ('label_E', 'label_Vs') attached to the data variables Spacecraft Potential from 2 probes ('label_Vs').Sunward and Duskward Electric Field ('label_E').ISTP/IACG standard time Epoch ( support_data) is attached to the data variables using theĮpoch ( support_data, O dimension in CDF) is listed as, e.g., 0 10:20:00.000īut stored as a Real*8 scalar variable for ease of manipulation across day, month, and year boundary.īecause the two variables, Sunward and Duskward Electric Field and Spacecraft Potential from 2 probes,Įach have two components and are likely to be plotted as separate time-series plots, then they each need These data variables have an associated time tag, that is, they each depend on time. Spacecraft Potential from 2 probes has two components-> in CDF store as 1-dimension with size 2.Bias Current is a scalar -> in CDF store as 0-dimension with no size.Deviation from sin wave is a scalar -> in CDF store as 0-dimension with no size.Sunward and Duskward Electric Field has two components -> in CDF store as 1-dimension with size 2.Ground-Based Magnetometers, Riometers, Sounders Įxample data variables from the Geotail Electric Field Detector are listed below with theirĬorresponding dimensions and sizes in CDF.Choose one from the list below to seeĮxample variables specific to the instrument type and their corresponding dimensions and sizes in CDF. We have identified a number of instrument types for Space Physics. Necessary coordinate indices for the image array. Latitude and longitude ( support_data) are one-dimensional variables of size 256, providing the The image array ( data) maps into a two-dimensional variable with sizes 256 and 256.Flux ( data) andĮnergy ( 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 orthogonalĬomponents 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.Their corresponding dimensions and sizes in CDF are also shown. After understanding this structure look at the full list of required descriptions inĮxamples of the three types of variables commonly found in ISTP/IACG investigations are shown below. We describe each of these kinds of variables with specific examples taken from Space Physics instrument Support_data variables and the label metadata variables are attached to the data variables through the Label metadata variables (e.g., a variable holding 'Bx,By,Bz' to describe magnetic field). Secondary importance (e.g., time, coordinate_system, energy_bands associated with particle_flux) and Of primary importance (e.g., density, magnetic_field, particle_flux), support_data variables of We have identified three types of variables to be included in ISTP/IACG CDF files: data variables