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=== True Elevation ===


Wisconsin uses the concept of True Elevation on segments within the State. The use of '''True Elevation''' (TE) is to better represent segments in relationship with its surroundings/ground level. Most segments should have an elevation of ground unless they pass over another segment, waterway, or natural feature. '''Drivable and non-drivable segments are handled the same way with elevation'''. 
'''The practice of True Elevation is NOT observed on Freeway or Ramp segments.''' 
'''Definitions'''
''Bridge''
* Segment travels over another segment (also known as overpass)
* Segment travels over a river or body of water
* Segment artificially elevated to pass over ground level objects and natural features.
''Tunnel''
A tunnel is any road segment that is underground and thus the GPS reception is inconsistent.
'''Implementation'''
* Elevation of overlapping segments should be set relative to each other, with the lowest segment as Ground (unless that segment is a tunnel).
* Only elevate/lower the actual bridge/tunnel section of the road. 
* Bridges should be cut at the start/end of the bridge where the land falls away. You can usually see guardrail at the start/end of the bridge section. Also the pavement type may change (Asphalt to Concrete for example).
** Do not cut segments for elevation purposes if the bridge starts/stops within 500ft(150m) of an existing junction.
**Do not create a segment less than 200 feet(60m) in length
** No need to elevate segments over every small creek or box culvert. Only elevate over significant waterways or natural features.
* Only set elevation as low/high as necessary. For example, no segment should be Elevation +2 unless it passes over another segment with Elevation +1.
* Tunneled segments shall have lower elevation, relative to ground and ''Tunnel'' should be checked.
* Only segments that are actually '''underground''' should have the negative elevation.
* Tunnels should be cut at least 15m/50ft before and after the tunnel, to allow time for the GPS to regain signal.
* '''The use of common sense is paramount in using True Elevation.'''
''NOTE: If you use the Bridge tool to join segments, be aware that it raises the elevation of the joined segment. Lower the joined segment as appropriate.''

Latest revision as of 16:12, 6 October 2020

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