This layer indicates the relative elevations of transportation nodes. It outlines relationships between street segments on different planes via node-and-segment connectivity (e.g. 0 for surface, -1 for an underpass, and 1 for an overpass). Relative Elevation Nodes (REN) are a work-around for inherent limitations when navigating through three-dimensional street networks represented on the two-dimensional plane (i.e. computer screen). REN help to establish routing options and are particularly useful where complex overpass/underpass structures exist because they indicate street segments as being on different road-levels; where on the computer screen all streets appear to be connected.
Additional tables and supporting documentation are available in the Data Dictionary and User Manual.
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