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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.'''
-For freeway and ramp segments please reference national guidance [[Creating and editing road segments#Road elevation|Road Elevation]] and [[Overpasses, Underpasses and Bridges]].
-'''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.
-** 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 200ft/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 50ft/15m 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.''

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User:Ojlaw/Wisconsin View history

Latest revision as of 16:12, 6 October 2020