Christchurch Traveller Information Project
- About
- This page documents an organised mapping effort that occured 11 years ago.
- Captured time
- 2013
The Christchurch Traveller Information Project aims to create a fully routable road network for the city. This will help trip planning services reflect changes which have happened during the earthquake rebuild and suggest better routes through Christchurch. The work is being done as a subproject of the LINZ Canterbury SDI Programme Open Data project.
Five mappers worked on the first pass of edits from 26-30 August 2013. Local knowledge and aerial imagery were used to tag roads and intersections with information useful for routing software. This was a manual process of going through each intersection by hand rather than bulk importing data. Intersections were also surveyed to pick up turn restrictions and other features not visible from aerial imagery.
There is ongoing work to expand the area covered to Kaiapoi, Rangiora, Rolleston & Lincoln.
We are really interested in hearing from local mappers and data users about what needs fixing first and how to make the network more useful for everyone. Get in touch with User:duncantichch.
Editing Process
Standard OSM tags for routing are being used to tag roads. We are focusing specifically on the following features:
- Speed limits (maxspeed=*)
- Road names (name=*)
- One way streets (oneway=*)
- The number of lanes on major roads (lanes=*)
- Turn restrictions (restriction=*)
- Free left turns (turn=free_left)
free_leftis a non-standard value which indicates the turning lane bypasses traffic lights.
- Traffic lights (highway=traffic_signals)
- Roundabouts (highway=mini_roundabout and junction=roundabout)
- Bus lanes (busway=lane)
- Traffic calming (traffic_calming=*)
- Median strips (splitting roads where medians affect turning or are longer than 50m)
Central City Road Closures
Temporary road closures in the central city are not being captured as we need to work out how they can be maintained once the project winds down. Another group is preparing an open data feed of these road closures, so it is best they are left out of the map for the time being.
Mappers
The following project specific accounts are being used:
Tools
Potlatch 2 is being used in combination with the OSM Tasking Manager. We are using the 2011 post-earthquake aerial imagery supplied by LINZ under creative commons cc by and being served by Environment Canterbury for use by OSM mappers.
Imagery URL
ID
http://gis.ecan.govt.nz/arcgis/rest/services/Imagery/Greater_CHCH_Latest_Imagery/MapServer/tile/{z}/{y}/{x}
Potlatch 2
http://gis${1|2|3}.ecan.govt.nz/arcgis/rest/services/Imagery/Greater_CHCH_Latest_Imagery/MapServer/tile/$z/$y/$x
JOSM
tms:http://gis{switch:1,2,3}.ecan.govt.nz/arcgis/rest/services/Imagery/Greater_CHCH_Latest_Imagery/MapServer/tile/{zoom}/{y}/{x}