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Update README.md
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pebau authored Jan 11, 2024
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Expand Up @@ -25,13 +25,13 @@ Responding to requirements phrased in the project the range type in coverages ha

Of particular interest are the components:

- field name: the record component name under which range values are known and can be extracted, such as `$c.red` in WCPS; this must follow the usual syntax conventions of program variable names
- definition: the technical data type (int, float, etc.), expressed through OGC URIs as OGC requires
- description: a human-readable text explaining the meaning
- nil values, as pairs of reason (some text) and a value (taken from the data type definition, see above)
- unit of measure: OGC has no guidance on this; earlier UCUM was used, but it appears inconvenient. In Fairicube QUDT seems preferred - more to come once agreed, stay tuned.
- **field name**: the record component name under which range values are known and can be extracted, such as `$c.red` in WCPS; this must follow the usual syntax conventions of program variable names
- **definition**: the technical data type (int, float, etc.), expressed through OGC URIs as OGC requires
- **description**: a human-readable text explaining the meaning
- **nil values**, as pairs of reason (some text) and a value (taken from the data type definition, see above)
- **unit of measure**: OGC has no guidance on this; earlier UCUM was used, but it appears inconvenient. In Fairicube QUDT seems preferred - more to come once agreed, stay tuned.

Importantly, datacubes (as data in general) fall into one of several different categories, as statistics teaches: numerical, ordinal, and categorial. SWE Common (upon which the coverage range type relies) supports that halfways, therefore an activity is planned to reflect these categories in a statistically correct way in the OGC/ISO coverage standards.
Importantly, datacubes (as data in general) fall into one of several different categories, as statistics teaches: *numerical*, *ordinal*, and *categorial*. SWE Common (upon which the coverage range type relies) supports that halfways, therefore an activity is planned to reflect these categories in a statistically correct way in the OGC/ISO coverage standards.

In XML, the complete range type structure is as in the following example:

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