Site processing tools
•RivEX has a suite of tools for processing sites. A site is a point snapped to the river network.
•Analysing the network with site data requires you to have built the specific fields used by RivEX through the various attribution processes. You cannot proceed until such fields are created. Your river network must conform to the RivEX input specifications.
•The available site processing tools are:
•Find sites upstream of a site
•Find sites downstream of a site
•Transfer network attributes to the site
•Build a link to nearest sites (within a layer)
Tools that use lengths extracted from the network will be in the units of the dataset. This won't make much sense if the dataset is in decimal degrees and would in fact cause other RivEX tools to process the network incorrectly. If your network is not in units of meters you must project your dataset into a coordinate system that is. See more advice here.