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The EX_Extent object is used for describing geographic extents in ISO meadatametadata.  The EX_Extent object provides several options for describing geographic extents; which include Bounding Box, Bounding Polygon, Geographic Desciptions and Spatial Temporal Extents.

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Where are Temporal Extents used in CMR metadata?

The EX_Extent object is used for describing temporal extents in ISO metadata.  In CMR metadata collections the gmi:TimePeriod element is most commonly used for describing temporal extents.  This TimePeriod element includes beginPositon and endPosition elements.  It's recommended that datasets which are ongoing use the indeterminatePosition='Now' attribute in the endPosition element.

The table below shows where temporal elements are used in CMR metadata collections.

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