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| Experiment | In the context of this convention, any action that results in one or more signals that need to be stored. E.g. MMS2 Measurement, ReFresco Calculation, XMF Simulation, SHARK data analysis. |
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| H5M | MARIN convention of structuring the content of a HDF5 container for Experiment Datasets. |
Base Signal Dimension Signal Master Signal | Independent value range. E.g. the timestamp values for a time series signal that correspond with each sample value. |
| Signal | Measured, calculated or simulated variable; range of values. |
| Signal Set | Set of signals grouped by one or more common properties. E.g. origin, experiment run, sample rate, sample count, timestamp. |
| Dependant Signal | Dependent value range. E.g. the sample values at each corresponding timestamp for a time series signal or the RAO value at certain values on several frequency axis. |
| A / O / NS | A: always (must be present) and always with a valid value – critical attribute NS: must be present, but may be “not specified” – not critical, but users should be aware if missing O: may be omitted, only specify if value is meaningful – optional |
| <data_type>[] | Represents an array of the type <data_type> . A scalar is represented only by <data_type> |
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The signal set group contains a set of signals that are logically a single group. Such signals share common properties like number of samples andsample and sample rate. Which properties are common has to be determined by the consumer of the data; either a human or an application.
Name: HDF Group name of the set of signals.
Path: "/<signal set name>"
Attributes:
Name | Role | Data type | Exists? | Description | Convention / example |
type | a | utf8 | NS | type of signals in the set. Value NS maps to “General”. | “General”, “Frequency”, “Time” |
rawName | i | utf8 | O | original signal set name if this had to be renamed to be used as valid hdf5 name. | |
description | i | utf8 | NS | additional description of the set | (tbd) |
parent | s | obj_ref | O | Link to parent signal set. | (tbd) |
parentName | s | utf8 | O | For information only: the name of the parent signal set. | |
dataScale | a | float64 | A | Scale of the signal values in the set with respect to full scale | 1.0 ( at full scale) 23.456 (model scale, smaller than full scale) 0.023456 (model scale, larger than full scale) |
waterDensityFactor | a | float64 | NS | water density factor to be used for scaling data values to full scale. | 1.432 |
stepSize | i | float64 | A | if one and only one master signal for all signals and it is equidistant a value; otherwise, NaN In case of a time master this is the inverse of the sample rate. | |
dateTimeRecordingStart | a | iso_fmt | A | date and time of first sample of the time signal of measurement or simulation. | (tbd) |
dateTimeRecordingEnd | a | iso_fmt | O | date and time of last sample of the time signal of the measurement or simulation. | (tbd) |
projectNo | a | int32 | A | projectnumber | “80220” |
projectSubNo | i | int32 | NS | subnumber | “368” |
programNo | a | int32 | A | test programme number | 1 |
source | a | utf8 | A | name of the source application or facility | “SMB”, “ReFresco” |
categoryNo | a | int32 | A | Number of the test category used. | 2 |
testNo | a | int32 | A | Number of the test setup used. | 3 |
experimentNo | a | int32 | A | Number of the experiment settings used. | 4 |
measurementNo | a | int32 | A | Number of the actual measurement c.q. experiment execution | 2 |
| branchNo | a | int32 | O | Number of the acquisition branch. E.g, time traces from simulations where jumps to earlier points in time are possible. | 1 |
| sequenceNo | a | int32 | O | Consecutive number of the signal set wrt to other signal sets. E.g, time traces from simulations in a given branch result in consecutive sets each time the set of logged properties changes. | 13 |
modelScale | a | float64 | A | Scale of the model in this project. (Unrelated to the signal values in the set.) | 23.456 |
notes | i | utf8 | NS | Any additional information about this signal set. | (free text) |
writeErrors | i | utf8[] | O | Specifies any errors that occurred while writing the signal set (group). |
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Each section entry in this section defines a specific type notation that is used in the chapter 'H5M Structure'.
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