Chris little temporal crs 1#223
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Added Temporal CRS to definition of Temporal Reference Systems.
Added example for Temporal Coordinate Reference System with JSON representation.
Improved clarity in the description of geospatial coordinate reference systems and possible datums. Added examples for geographic and projected CRSs.
Corrected typos and improved clarity in the documentation regarding temporal reference systems.
Updated URLs to use HTTPS and corrected hyphenation in text.
| - The object MAY have an `"id"` member, whose value MUST be a string and SHOULD be a common identifier for the reference system. | ||
| - The object MAY have a `"datum"` member if the identified reference system definition does not specify a datum. |
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Would it be more appropriate to use SHOULD in cases where the reference system does not specify a datum?
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Not necessarily. I am allowing CRS without a datum e.g. a time series, of relative times, but not yet coordinated or referenced. Perhaps a sequence of archaeological layers.
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| - The value of the `"type"` member MUST be "VerticalCRS" | ||
| - The object MAY have an `"id"` member, whose value MUST be a string and SHOULD be a common identifier for the reference system. | ||
| - The object MAY have a `"datum"` member if the identified reference system definition does not specify a datum. |
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Would it be more appropriate to use SHOULD in cases where the reference system does not specify a datum?
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Another example, the CRS may be in spatial engineering coordinates, but not yet fully geo-referenced. E.g. space-based imagery, not yet geo-referenced.
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| The value of the `"type"` member MUST be "TemporalCRS" | ||
| - The object MAY have an `"id"` member, whose value MUST be a string and SHOULD be a common identifier for the reference system. | ||
| - The object MAY have a `"datum"` member if the identified Temporal Coordinate Reference System definition does not specify a datum. |
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Would it be more appropriate to use SHOULD in cases where the reference system does not specify a datum?
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Same as previous comments!
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add text describing the use of
datumsfor all CRSs