TelenavMapping / AU-NZ_mapping_projects

Containing mapping projects on different areas in Australia and New Zealand. Issues contain editing plan, overview and conclusions after they are done.
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[AU-NZ] Speed Limit #8

Open hoream-telenav opened 5 years ago

hoream-telenav commented 5 years ago

Description

To make OpenStreetMap more navigable and accurate in guidance, our mapping team is planning to start an editing project in Australia and New Zealand. Starting with January next year until June we will focus on road geometry, road name, oneways, signpost, turn restrictions, speed limit, lanes, turn lanes, hov lanes and toll roads in Auckland, Canberra, Perth and Melbourne. image

In this project we will map speed limit in these cities and we will focus on adding missing information as well as improving the existing data in OSM.

How to map

We will follow the mapping scheme that is already used in the Australia, as it is described on this page: https://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines

For editing speed limits we will use JOSM and a map paint style specially created to highlight the maxspeed tag of each way. We will use the maxspeed= , maxspeed:forward= , maxspeed:backward= * tags to add the speed limits on every way.

Speed limits are often shown on a sign at the start of the restricted section. A posted speed limit may only apply to that road or to all roads beyond the sign. Some places provide an additional "speed zone ahead" before the restriction. Also, speed limit reminder signs may appear at regular intervals, painted on the road surface.

For adding speed limits, we are using the newest trips from Open Street Cam. We review the available trips looking for speed limit signs, then we add or update the speed limits tags starting from the point where the signs appear.

In situations where the road signs are near an intersection the starting/ending point of the speed limit rule will be starting/ending from/in the intersection node.

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For two-way streets, where we have different lane values for each way, we use the maxspeed:forward= and the maxspeed:backward= tags to be able to map both numeric values. Forward means the direction in which the way is drawn in Open Street Map, while backward means the opposite direction.

NOTES Be careful when you add speed limit at the measurement system applied in the country you edit. For example if the speed limit it's measured in miles/hour you should add "mph" at the end (ex:maxspeed=50 mph). If you don't add this info it means the default measurement system is in kilometer/hour(kph).

See also: • https://github.com/TelenavMapping/Telenav_mapping_team_practices_and_workflow/wiki/Speed-Limit-Best-Practices

Who will be involved?

Telenav mapping team with the following usernames: gabis_telenav, marinad_telenav, mihaii_telenav, lacram_telenav, istvanv_telenav, lorandr_telenav, marianp_telenav, alinan_telenav, bogdanp_telenav, hoream_telenav, inah_telenav, oliviap_telenav, biancah_telenav, petrar_telenav, corinag_telenav, danielar_telenav, teodorab_telenav, ionutr2_telenav, ioanam_telenav, catalinad_telenav, danuta_telenav.