4. Spatial Reference Information

• the description of the reference frame for, and the means to encode, coordinates in the data set.

Type:

compound

Short Name:

spref

4. Spatial Reference Information (Mandatory if Applicable)
     CONTAINS
     4.1 Horizontal Coordinate System Definition (Mandatory if Applicable)
     AND
     4.2 Vertical Coordinate System Definition (Mandatory if Applicable)

     4.1 Horizontal Coordinate System Definition (Mandatory if Applicable)
          CONTAINS
          A CHOICE OF 1 OUT OF 3 ELEMENTS:
          { 4.1.1 Geographic (Mandatory)
          OR
          4.1.2 Planar (Mandatory) (can be repeated unlimited times)
          OR
          4.1.3 Local (Mandatory) }
          AND
          4.1.4 Geodetic Model (Mandatory if Applicable)

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