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Update 00-preface.adoc
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chris-little authored Feb 14, 2024
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== Preface

When OGC Standards involve time, they generally refer to the ISO documents such as Geographic information Temporal schema <<iso19108>> (now largely superseded), Geographic information Referencing by coordinates <<iso19111>>, Date and Time Format <<iso8601>>, and their freely available OGC equivalents, such as OGC Abstract Specification Topic 2: Referencing by coordinates <<ogc18005>> (the equivalent to <<iso19111>>).
When OGC Standards involve time, they generally refer to the ISO documents such as Geographic Information Temporal Schema <<iso19108>> (now largely superseded), Geographic information Referencing by coordinates <<iso19111>>, Date and Time Format <<iso8601>>, and the freely available OGC equivalents, such as OGC Abstract Specification Topic 2: Referencing by Coordinates <<ogc18005>> (the equivalent to <<iso19111>>).

Over decades, much effort has gone into establishing complex structures to represent calendar based time, such as the <<iso8601>> notation, and many date-time schemas. A consequence of this effort is that many end-users and developers of software use calendar based "coordinates", with the associated ambiguities about underlying algorithms, imprecision and inappropriate scope.

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