tomtom-international
Togo | Data Improvements
Project description
Goal
To improve the map quality in Togo, we propose to make data improvements by sharing challenges, and when appropriate, fixing data errors, and adding or editing certain kinds of geometry.
How to participate
Anyone is welcome to contribute to this project by participating in our MapRoulette challenges. Here is the extended documentation for using MR. Note that sometimes additional instructions are provided within the challenges.
Challenges
Quality check challenges
Click to expand.
Ways with tag highway=* must be connected to the rest of the road network to ensure its continuity, e.g. for route planning. When such a way is not connected to another way with tag highway=*, an error is logged.
The area=yes tag is required for some closed ways when used to define a polygon. For closed ways with other tags, there is an assumption that the way defines an area. In some circumstances, a closed way may define both a closed polyline and an area. When tag area=yes is used, it is expected that one of the necessary accompanying tags is also found.
In general, roads intended for vehicles should be built to maintain proper angles which ensure maneuvers and fluent traffic. Extreme, too sharp angles applied to a way may indicate errors in the road geometry.
The necessary edits will be made to fix cases where the tag on a way indicates that the object is a polygon feature, but the way does not meet the definition of a closed way because it is self-intersecting, or ways in a relation with the same role form a self-intersecting polygon
Simple areas are mapped in OSM by creating a closed way and tagging it as an area object rather than a line. Relations of the type multipolygon are used to represent complex areas with holes inside or consisting of multiple disjoint areas. A multipolygon relation can have any number of ways in the role outer (the outline) and any number of ways in the role inner (the holes), and these must form valid rings to build a multipolygon. When a relation of the type multipolygon consists of only one member, which is a simple area, an error is logged.
Buildings with extremely sharp angles will be identified and corrected if needed.
Features intended to be a polygon should be correctly tagged. When the tag indicates that the object should be a polygon, but the geometry is built out of a NON-closed way, an error is logged.
Identify and fix, if needed, situations where a building intersects with another building at the same layer.
Identify and fix cases where highways intersect without a common node.
Identify and fix, if needed, situations where a water feature intersects with a building.
Geometry challenges
Click to expand.
- Missing Roads (regional challenge for Western Africa)
Data analysis done by TomTom suggests that there should be a road or track here in OSM, but it is missing.
Taking Manager
Click to expand.
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Mapping Missing Roads in Dapaong
Mapping missing roads: Identify and add missing roads along with accurate tags that consist of road types and other attributes. Mapping missing buildings: Locate and add missing buildings that could be residential, commercial, or other structures.
Geographical scope
Data improvements will be made across the whole country.
Announcements
This project was announced in:
- the Talk-africa mailing list (for quality checks),
- the Talk-tg mailing list (for geometry).
- The WhatsApp group of OSM Togo, 5th February 2024.
- The WhatsApp group of OSM Togo, 12th April 2024.
- The WhatsApp group of OSM Togo, 10th July 2024.
- The WhatsApp group of OSM Togo, 14th October 2024.
- The WhatsApp group of OSM Togo, 20th January 2025.
TomTom organised editing
We will follow the Organised Editing Guidelines for this project. TomTom will not make any edits until two weeks after the project announcement. Here is our Organised Editing page, including a list of our editors.
How to find TomTom's edits
All edits made by our team have the hashtag #tt or #tomtom.
Sources for editing
- Esri World Imagery
- Bing Maps Aerial
- Mapbox Satellite
How to reach out
If you have remarks about a specific edit of ours, please drop a comment in the changeset, and we will do our best to respond thoughtfully. Or, you can also:
- send a message to the project lead Hajar
- join the conversation in the Talk-africa mailing list and the Talk-tg mailing list (see Announcements),
- email [email protected].
