Bridge3D
| Bridge3D | |
|---|---|
| Proposal status: | Draft (under way) |
| Proposed by: | Marek_kleciak |
| Applies to: | |
| Definition: | Bridge in 3D |
| Draft started: | 2014-07-22 |
This wiki page describes some ideas for 3D modeling of bridges. This is recently only working version for one proposal. Ideas, suggestions are welcome.
Status Quo
2D
Rendering has known problems with bridges with several separated lanes necessarily for right routing:
Use of area concept for bridges helps to render better 2D maps, see man_made=bridge
3D
For simple multilevel bridges this proposal can be used to map bridge levels.
Another idea would be use of building=yes concept for drawing of building parts.
Idea
Modify S3DB concept and draw bridges as well.
Example:
Simple bridge with pillar.
Section
Tagging: open questions and ideas
- column=yes or pillar=yes or barrier=wall with area=yes (please vote)
- bridge:part=yes or building:part=yes (please vote)
- how to tag value H1? (Thickness of main bridge plateau): bridge:height:ele=90
- bridge:height:ground_level=25
- bridge:min_level=23.5
Bridges with height profile
Very often is the surface of a bridge not flat. In such situations the surface of the bridge shuuld be divided in more areas tagged as: bridge:part=ramp The street vector (highway=* + bridge=yes) gets two (different) ele=* values respectively on both sides of bridge:part.
Sketch: dividing of bridge area in subareas bridge:part=yes
Top and side view of typical bridge with different heights.
How to map height
ele=* values on highway=* on the outline shape of bridge:part=ramp