Extension Maturity Classification: Proposal
Data cube related metadata, especially to describe their dimensions.
| Field Name | Type | Description |
|---|---|---|
| cube:dimensions | Map<string, *> | Uniquely named dimensions of the data cube. |
* = One of the objects defined below:
A spatial dimension in one of the horizontal (x or y) directions.
| Field Name | Type | Description |
|---|---|---|
| type | string | REQUIRED. Type of the dimension, always spatial. |
| axis | string | REQUIRED. Axis of the spatial dimension (x, y). |
| extent | [number] | REQUIRED. Extent (lower and upper bounds) of the dimension as two-dimensional array. Open intervals with null are not allowed. |
| values | [number] | Optionally, a set of all potential values. |
| step | number|null | The space between the values. Use null for irregularly spaced steps. |
| reference_system | string|number | The spatial reference system for the data, specified as EPSG code or PROJ definition. Defaults to EPSG code 4326. |
A spatial dimension in vertical (z) direction.
| Field Name | Type | Description |
|---|---|---|
| type | string | REQUIRED. Type of the dimension, always spatial. |
| axis | string | REQUIRED. Axis of the spatial dimension, always z. |
| extent | [number|null] | If the dimension consists of ordinal values, the extent (lower and upper bounds) of the values as two-dimensional array. Use null for open intervals. |
| values | [number|string] | A set of all potential values, especially useful for nominal values. |
| step | number|null | If the dimension consists of interval values, the space between the values. Use null for irregularly spaced steps. |
| unit | string | The unit of measurement for the data, preferably the symbols from SI or UDUNITS. |
| reference_system | string|number | The spatial reference system for the data, specified as EPSG code or PROJ definition. Defaults to EPSG code 4326. |
An Vertical Spatial Dimension Object MUST specify an extent or a set of values. It MAY specify both.
A temporal dimension based on the ISO 8601 standard. The temporal reference system for the data is expected to be ISO 8601 compliant (Gregorian calendar / UTC). Data not compliant with ISO 8601 can be represented as an Additional Dimension Object with type set to temporal.
| Field Name | Type | Description |
|---|---|---|
| type | string | REQUIRED. Type of the dimension, always temporal. |
| extent | [string|null] | REQUIRED. Extent (lower and upper bounds) of the dimension as two-dimensional array. The dates and/or times must be strings compliant to ISO 8601. null is allowed for open date ranges. |
| values | [string] | If the dimension consists of set of specific values they can be listed here. The dates and/or times must be strings compliant to ISO 8601. |
| step | string|null | The space between the temporal instances as ISO 8601 duration, e.g. P1D. Use null for irregularly spaced steps. |
An additional dimension that is not spatial.
| Field Name | Type | Description |
|---|---|---|
| type | string | REQUIRED. Custom type of the dimension, never spatial. |
| extent | [number|null] | If the dimension consists of ordinal values, the extent (lower and upper bounds) of the values as two-dimensional array. Use null for open intervals. |
| values | [number|string] | A set of all potential values, especially useful for nominal values. |
| step | number|null | If the dimension consists of interval values, the space between the values. Use null for irregularly spaced steps. |
| unit | string | The unit of measurement for the data, preferably the symbols from SI or UDUNITS. |
| reference_system | string | The reference system for the data. |
An Additional Dimension Object MUST specify an extent or a set of values. It MAY specify both.
None yet, still in proposal stage.