Figure 1. UML diagram specifying the WIGOS Metadata Standard (**: code tables expected; [0..1*]: optional or conditional elements. Conditional elements become mandatory if a given condition is met. Conditions are referenced in parentheses. Optional elements may be declared mandatory as part of profiling the standard for specific application areas; [1..*]: mandatory elements. These elements must be reported, and if no value is available, a nilReason must be reported, which indicates that the metadata is or available”). “unknown”, “not Table 2. Names and definition of elements An asterisk (*) denotes the element is required for the WMO Rolling Review of Requirements (RRR) process. A hash sign (#) denotes that it is acceptable to record a "mandatory" element with a of nilReason (that indicates that the metadata is either or applicable”, or available”). “unknown”, “not “not Category Id Name Definition MCO Phase 1-01 Observed variable measurand Variable intended to be measured or observed or derived, including the biogeophysical context M* 1 – 1-02 Measurement unit Real scalar quantity, defined and adopted by convention, with which any other quantity of the same kind C* 1 can be compared to express the ratio of the two quantities as a number [VIM3, 1.9] Observed variable 1-03 Temporal extent Time period covered by a series of observations inclusive of the specified date-time indications M* 1 (measurement history) 1-04 Spatial extent Typical georeferenced volume covered by the observations M* 1
Figure 1. UML diagram specifying the WIGOS Metadata Standard (**: code tables expected; [0..1*]: optional or conditional elements. Conditional elements become mandatory if a given condition is met. Conditions are referenced in parentheses. Optional elements may be declared mandatory as part of profiling the standard for specific application areas; [1..*]: mandatory elements. These elements must be reported, and if no value is available, a nilReason must be reported, which indicates that the metadata is “unknown”, or “not available”). Table 2. Names and definition of elements An asterisk (*) denotes the element is required for the WMO Rolling Review of Requirements (RRR) process. A hash sign (#) denotes that it is acceptable to record a "mandatory" element with a of nilReason (that indicates that the metadata is either “unknown”, or “not applicable”, or “not available”). Category Id Name Definition MCO Phase Observed variable 1-01 Observed variable – measurand Variable intended to be measured or observed or derived, including the biogeophysical context M* 1 1-02 Measurement unit Real scalar quantity, defined and adopted by convention, with which any other quantity of the same kind can be compared to express the ratio of the two quantities as a number [VIM3, 1.9] C* 1 1-03 Temporal extent Time period covered by a series of observations inclusive of the specified date-time indications (measurement history) M* 1 1-04 Spatial extent Typical georeferenced volume covered by the observations M* 1
CBS-16-d03-1(1)-MANUAL-ON-WIGOS-ANNEX-approved_en.docx