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Tanzania | Data Improvements #70

Open marjanvandekauter-tomtom opened 2 years ago

marjanvandekauter-tomtom commented 2 years ago

Project description

Goal

To improve the map quality in Tanzania, we propose to make data improvements by sharing challenges that can help fix data errors, and add certain kinds of features. When appropriate, our team will also work on these challenges. If a challenge is more suitable to be solved without organised help, we will leave it for local users interested in completing the tasks. Challenges like this will be indicated as such in the overview below.

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. We also strongly encourage you to make use of the resources listed in the OSM wiki section Tanzania Wiki page while you are editing.

Challenges

Quality check challenges

Click to expand. - [Not connected highway](https://maproulette.org/browse/challenges/18181) 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. - [Tag area=yes on object without feature type](https://maproulette.org/browse/challenges/18182) 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. - [Impossible angle in a highway](https://maproulette.org/browse/challenges/18185) 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. - [Polygon has self-intersection](https://maproulette.org/browse/challenges/18180) 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 - [This multipolygon is a simple polygon](https://maproulette.org/browse/challenges/18184) 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. - [Spiky buildings](https://maproulette.org/browse/challenges/18186) Buildings with extremely sharp angles will be identified and corrected if needed. - [Polygon is not closed](https://maproulette.org/browse/challenges/18179) 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. - [Fix Building and Highway Intersections](https://maproulette.org/browse/challenges/40222) Identify and fix, if needed, cases where a way with tag highway=* intersects with a building. - [Fix Incorrect Highway Junctions](https://maproulette.org/browse/challenges/42367) Identify and fix if needed, cases where highway junctions are incorrectly or imprecisely mapped.

Edits based on User Feedback

We will make improvements to OSM based on user feedback submitted for the TomTom map after comparing and ensuring that it is also valid for OSM. Here is a list of the types of edits to be made, provided they do not conflict with others’ edits and a local source is available: - Highways - Adding highways - Realigning highways - Adding or adjusting bridges, tunnels, layers, or relations - Updating lanes - Updating traffic signs - Addresses - Adding or correcting addresses - Updating the position of address nodes, usually when an object has multiple addresses - Adding or correcting names of ways - POIs (Points of Interest) - Adding POIs - Correcting POI locations - Adding or correcting POI information - Resolving POI-land use discrepancies - Handling POI closures - Land Use - Adding land use - Modifying existing land use extent - Adjusting building shape - Buildings - Adding buildings - Updating building type - Adjusting building shape - Water - Adding or realigning rivers, streams, and lakes.

Geometry challenges

Click to expand. - [Missing Roads](https://maproulette.org/browse/challenges/21827) (regional challenge for Eastern Africa) - [Add Highways](https://maproulette.org/browse/challenges/43547) Data analysis done by TomTom suggests that there should be a road or track here in OSM, but it is missing.

Tanzania Community Request

The Tanzanian community, Crowd2Map and Tanzania Development Trust have reached out to tomtom for supporting map data improvements specifically on road network, connectivity, village names and buildings.

Click to expand. - [Isolated Highways](https://maproulette.org/browse/challenges/29807) Leads are generated based on analysis of road classes and their connection to the rest of the road network. the goal is to connect the hanging roads to the nearest road network based on the available imagery and/or probe sources - Duplicate Villages The community requested to deliver leads for duplicate Villages with the same name, different casing and with no names, you can find the links [here](https://shared-assets.adobe.com/link/bac4dac0-a317-4d65-47e4-6e934d89d85e) - Oversize Buildings The community reported that new users added oversized buildings during HOTOSM challenges, however there has not been concentrated effort to detect and fix them. The file can be found [here](https://shared-assets.adobe.com/link/55bc8d39-1366-4bfb-52b6-e3c7c3e98b20) - [Missing Highways](https://maproulette.org/browse/challenges/36802) We spatially compared TomTom's in-house road centerlines with the OSM road network and identified missing highway locations

Geographical scope

Data improvements will be made across the whole country.

Announcements

This project was announced in:

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

For some OSM map edits TomTom editors will use proprietary sources for support. These will typically be in situations where there is not sufficient evidence using the available sources in OSM editors themselves. The proprietary sources will be ground-level imagery and GPS traces, both collected by TomTom's mobile mapping vans. On occasion, we will also use sources collected from a field survey by one of TomTom's sourcing specialists who have visited the location and collected data to support the required map updates.

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:

UncleFrankTz commented 1 year ago

Good project

ghost commented 1 year ago

https://donate.openstreetmap.org 😄

kiranahiretomtom commented 1 year ago

The 'Sources for editing' section updated with the below information-

  1. Removed Maxar Premium Imagery from the list as it's not available anymore in OSM
  2. Added a description of proprietary sources to support editing