==== Spectral measurements collected in the field or lab ====

Metadata elements for documenting spectral measurements collected in the field or lab. 

Source: OGC Abstract Specification Topic 20: Observations, measurements, and samples

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^ Metadata element      ^ Description                                                                                   ^ Example                                                                                 ^ Source                                                         ^
| Unique identifier     | Unique metadata identifier                                                                    | 123e4567-e89b-12d3-a456-426614174000                                                    | OGC Abstract Specification Topic 20: Observations, measurements, and samples |
| observedProperty      | e.g. canopy or soil reflectance                                                               | Rice Canopy spectral reflectance (>200 spectral bands)                                  | OGC Abstract Specification Topic 20                          |
| spatialSample         | e.g. sample Grid (Elementary Sampling Unit, plots)                                            | The measurements have been collected from 10 Elementary Sampling Units (ESU) (10 ESU in total) and in each ESU, there are 4 plots each of 15*15 m | OGC Abstract Specification Topic 20                          |
| location              | If location information is provided, the attribute location:Geometry shall be used.           | Latitude: 44.88333885<br>Longitude: 11.95780087                                        | OGC Abstract Specification Topic 20                          |
| procedure             | Used instrument (observing procedure)                                                         | Spectral Evolution spectrometer                                                        | OGC Abstract Specification Topic 20                          |
| result                | Observation: e.g spectral values                                                              | Spectral values                                                                         | OGC Abstract Specification Topic 20                          |
| time                  | When the measurements were carried out                                                        | 06/21/2023                                                                              | OGC Abstract Specification Topic 20                          |
| startTime             | Start of the measurements                                                                     | 17:56.4                                                                                | EO4Nutri                                                      |
| endTime               | End of the measurements                                                                       | 20:43.0                                                                                | EO4Nutri                                                      |
| cropGrowthStage       | Crop growth stage: vegetative, reproductive or maturity, or pre-harvest                       | Maturity Phase                                                                         | EO4Nutri                                                      |
| processingStage       | Raw spectral measurements or pre-processed                                                    | Mean spectral measurements                                                             | EO4Nutri                                                      |
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