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MeasurementComponent

A MeasurementComponent is a node in the measurement tree. A measurement is usually a composite root component that contains one child component per metric or image; child components can themselves contain further components, so arbitrary hierarchies are possible.

Measurement                (composite)
├── Gloss 60°              (single, data = 87.3)
├── DOI                    (single, data = 92.1)
└── ledShadeImages         (array)
    ├── ledShadeImages_0   (file, data = binary image)
    ├── ledShadeImages_1   (file, data = binary image)
    └── ...

Properties

Property	CBOR key	JSON key	Type	Description
Identifier	`identifier`	`id`	string	Database identifier. May be `null`; importers typically discard it and assign a new one.
Version	`version`	`ver`	integer	Schema version of the record. Currently `2`.
SourceIdentifier	`sourceIdentifier`	`srcId`	string	Identifier assigned by the system that produced the measurement.
Type	`type`	`type`	string (enum)	Required. The component type, see below.
Name	`name`	`name`	string	Name of the component (e.g. the metric name).
Timestamp	`timestamp`	`time`	string (ISO 8601)	Time the component was stored.
SourceTimestamp	`sourceTimestamp`	`srcTime`	string (ISO 8601)	Time the component was recorded on the source device.
Data	`data`	`data`	map	The measurement value or file, see Measurement Data Types. `null` for pure grouping nodes.
Metadata	`metadata`	`meta`	map	Additional metadata about the value, see below.
Source	`source`	`src`	map	Information about where the measurement was taken, see below.
Components	`components`	`comp`	array of maps	Child components (nested `MeasurementComponent` records).
SourceSignature	`sourceSignature`	`srcSig`	string	Signature created by the source device (data authenticity).
Signature	`signature`	`sig`	string	Signature of the record.

Component types

The type value is one of the MeasurementTypes enum members (written in lowerCamelCase):

Value	Meaning
`single`	A single value; `data` holds the value.
`composite`	A grouping node; the children live in `components`.
`continuous`	A continuously recorded series of values.
`graph`	Graph/curve data.
`file`	A file embedded in the component; `data` is a `FileBinaryData` record.
`fileReference`	A reference to a file stored elsewhere; `data` is a `FileReferenceData` record.
`array`	An ordered collection of components of the same kind (e.g. an image stack).

Metadata

The optional metadata map describes the value in data:

Property	CBOR key	JSON key	Type	Description
Unit	`unit`	`unit`	string	Unit of the value (e.g. `"GU"`).
Accuracy	`accuracy`	`accuracy`	string	Accuracy of the value.
Environment	`environment`	`env`	map	A nested `MeasurementComponent` describing environmental conditions (e.g. temperature) at the time of measurement.

Source

The optional source map describes where the measurement was taken:

Property	CBOR key	JSON key	Type	Description
DeviceIdentifier	`deviceIdentifier`	`deviceId`	string	Identifier (e.g. serial number) of the measuring device.
LocationName	`locationName`	`loc`	string	Human-readable location name.
Latitude	`latitude`	`lat`	string	Geographic latitude.
Longitude	`longitude`	`lon`	string	Geographic longitude.

Declaration

public record MeasurementComponent : Identifiable
{
    public required MeasurementTypes Type { get; set; }
    public string? Name { get; set; }
    public DateTimeOffset? Timestamp { get; set; }
    public DateTimeOffset? SourceTimestamp { get; set; }
    public IMeasurementData? Data { get; set; }
    public IMetadata<MeasurementComponent>? Metadata { get; set; }
    public IMeasurementSource? Source { get; set; }
    public List<MeasurementComponent>? Components { get; set; }
    public string? SourceSignature { get; set; }
    public string? Signature { get; set; }
}

public enum MeasurementTypes
{
    Single,
    Composite,
    Continuous,
    Graph,
    File,
    FileReference,
    Array
}