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There is an additional file associated with each of the coverages containing a few new attributes. This file, with the '.dat' extension presently has three new fields, and an rrn field linking it to a unique arc in the '.aat'. The attributes are as follows:
MINOR5: This field was added by code original written by Mike Byrne at CalDFW, altered by Streamnet/PSMFC. It is an integer, and describes an arcs ordinal position within a route formed of all arcs with the same LLID. The most downstream arc always has value 1, the most upstream arc a value equal to the total number of arcs in the route, all others the number of arcs up from the mouth. This field can be used to identify the mouth of a route ( the fnode of the arc where minor5 = 1 ) and this can then be used to ensure that any route built goes in an upstream direction. It can also be used to analyze the connectivity between routes to calculate stream order, and identify parent and tributary relationships.
POSITION: Value is 'MOUTH' for downstream arcs, HEAD for upstream, blank elsewhere.
TRIBOF: The feat_name of the parent stream for a particular route.
A simple relate on RRN is all that is needed to utilize the attributes in this file.