Vertical Coordinate System Definition
The following elements comprise the Vertical Coordinate System Definition:
	Altitude System Definition, mandatory if applicable the reference frame or system from which altitudes (elevations) are measured. The term "altitude" is used instead of the common term "elevation" to conform to the terminology in Federal Information Processing Standards 70-1 and 173. Note:The following elements comprise the Altitude System Definition:
		Altitude Datum Name, mandatory the identification given to the surface taken as the surface of reference from which altitudes are measured.
		Altitude Resolution, mandatory the minimum distance possible between two adjacent altitude values, expressed in Altitude Distance Units of measure. Note: can be repeated unlimited times
		Altitude Distance Units, mandatory units in which altitudes are recorded.
		Altitude Encoding Method, mandatory the means used to encode the altitudes.
	Depth System Definition, mandatory if applicable the reference frame or system from which depths are measured. Note:The following elements comprise the Depth System Definition:
		Depth Datum Name, mandatory the identification given to surface of reference from which depths are measured.
		Depth Resolution, mandatory the minimum distance possible between two adjacent depth values, expressed in Depth Distance Units of measure. Note: Depth Resolution must be greater than 0.0
		Depth Distance Units, mandatory units in which depths are recorded.
		Depth Encoding Method, mandatory the means used to encode depths.
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