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Denmark | Data Improvements

Open SyedNasrulla-TomTom opened this issue 3 years ago • 1 comments

Project description

Goal

To improve the map quality in Denmark, we propose to make data improvements by sharing challenges that can help fix data errors, and add or edit certain kinds of features or tags.

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

While our team will also work on them, we welcome anyone to contribute to this project by participating in its MapRoulette challenges. Here is the extended documentation for using MR. Note that sometimes additional instructions are provided within the challenges.

Here is the current set of challenges.

Challenges

Quality check challenges

Click to expand.

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.

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

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.

Buildings with extremely sharp angles will be identified and corrected if needed.

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.

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.

Mini-roundabouts are a special kind of roundabout with the same rules as other roundabouts, but present as painted circles rather than physical circles. There might also be a low, fully traversable dome or island that vehicles can drive across. Road traffic flows in one direction around a point in the middle, and the traffic in the roundabout has right-of-way. A mini-roundabout is recorded using the tag highway=mini_roundabout.

Missing, Isolated feature and tag challenges

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Intersecting, missing and sharp/spiky Features challenges

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  • Denmark - Fix Spiky Buildings (updated) This collaborative effort requires a review and possible geometry correction, as the challenge identifies buildings with potential issues due to their unusual shape. It is aimed at improving data quality, accuracy, and aesthetics of OpenStreetMap, making it a more valuable resource for a wide range of users and applications.

  • Denmark - Fix Building and Highway Intersections Leads are generated based on a spatial comparison of highways and buildings available in the OSM data. The objective is to Identify and fix, if needed, cases where a way with tag highway=* intersects with a building.

  • Denmark - Fix Building and Water Intersections Identify and fix, if needed, situations where a water feature intersects with a building. We generate the leads after a spatial comparison of water features and buildings available in OSM.

  • Denmark - Fix Spiky Buildings This collaborative effort requires a review and possible geometry correction, as the challenge identifies buildings with potential issues due to their unusual shape. It is aimed at improving data quality, accuracy, and aesthetics of OpenStreetMap, making it a more valuable resource for a wide range of users and applications.

Point of Interests

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  • Denmark - Add Name tag for Educational Objects aims to improve the accuracy and usability of educational facility data on the map, and focusing on schools, colleges, and universities that are currently missing a name tag (name=*).

Edits based on map feedback

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We 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 o Adding or correcting highways o Adding or correcting link roads o Adding or adjusting bridges, tunnels, layers, or relations o Adding or updating lanes and related properties o Adding or updating traffic signs o Adding or updating access barriers o Adding or updating turn restrictions

  • Addresses o Adding or correcting addresses o Updating the position of address nodes, usually when an object has multiple addresses o Adding or correcting names of ways

  • POIs (Points of Interest) o Adding POIs o Correcting POI locations o Adding or correcting POI information o Resolving POI-land use discrepancies o Handling POI closures

  • Land use o Adding land use o Modifying existing land use extent

  • Buildings o Adding buildings o Updating building type o Adjusting building shape

  • Water o Adding or realigning rivers, streams, and lakes.

  • Railways o Adding railway tracks o Realigning railway tracks o Adding or adjusting railway infrastructure tags such as bridges, tunnels, level crossings

  • Ferry Lines o Adding ferry Lines o Realigning ferry lines o Adding ferry terminals

These are incidental edits spread over time starting June 5th, 2023. We follow local guidelines and, if needed, consult with the community before making an update.

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

  • SDFE aerial imagery
  • Bing Maps Aerial (probably unreliable for buildings edits), please contact the Danish community for more details
  • Esri World Imagery (probably unreliable for buildings edits), please contact the Danish community for more details

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:

SyedNasrulla-TomTom avatar Jul 21 '22 06:07 SyedNasrulla-TomTom

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

kiranahiretomtom avatar Oct 19 '23 07:10 kiranahiretomtom