LinkDirectionValue

The WatercourseLink feature is attributed with a flowDirection with a data type of LinkDirectionValue. The following table lists the codes which are used to populate this field and gives a description for each code.

This code list is inherited from INSPIRE and is not extendable.

Code list: LinkDirectionValue

List of values for directions relative to a link http://inspire.ec.europa.eu/codelist/LinkDirectionValue/

Code	Description
both directions	In both directions.
in direction	In the direction of the link.
in opposite direction	In the opposite direction of the link.

Where the flow direction has not been determined, this attribute is set to null and a nilReason is given.

• Where the value of nilReason is set to unknown, then the flow direction is not known to Ordnance Survey. A correct value may exist, but the methods employed by Ordnance Survey to date have not facilitated capture.

• Where the value of nilReason is set to missing, then the flow can be considered indiscernible. Ordnance Survey has attempted to identify the flow on the ground, but no flow has been determined.