Quality Assurance tools help lead to better quality of OSM data. Often, the tools achieve this by providing a list of bugs in the data, which mappers can then go and fix using editing tools. The bugs are either automatically detected based on rules and data analysis, or the tools provide a means of manually reporting them, or some combination of the two. There are many different ideas for how to do this, and what kind of bugs to focus on, hence many different tools.
OpenStreetMap is often more up-to-date and of a higher quality than other commercial maps when dealing with New and Changed Ways.
Bug reporting tools
These are tools that try to highlight and point out parts of the data that are likely wrong. There are also reports from manual quality checks by humans. In both cases, the reported issues may contain false positives and, when editing, care should be taken to ensure their accuracy. However, they can provide a very valuable visualisation of which areas need attention and can help spot and correct errors.
- MapDust is a bug tool operated by skobbler, which is also integrated into their OSM-based turn-by-turn navigation solution, thus originally focusing on navigation-relevant bugs but now serving as a general bug tool. As many of its users (end users!) may not be aware of OpenStreetMap at all, there are also quite a few non-relevant error reports included, but it does contain many good reports that are not covered by other tools. If a bug is determined to be caused by OSM data, an OSM editor can fix the data and mark the bug as resolved. Currently it is available in English, German, French, Italian, Spanish and Romanian.
Error detection tools
Error Detecting Tools check the OSM data for potential data errors, inaccuracy or sparsely mapped places. Users should check if these structures are really wrong (false positives usually occur and there are not really mapping rules which are set in stone) and correct the data for a continuously rising data quality.
|Tool||Coverage||Error types||Display mode||Fix suggestion||Downloadable||API||Correction guide|
|Keep Right||World||Many (50+)||Marker map||no||yes||yes||German only|
|Osmose||World||Many (200+)||Marker map||yes||yes||yes||yes|
|JOSM/Validator||Local||Many||List||yes||N/A||N/A||For some problems|
|OSM Inspector||World/Partial||Many||Rendered map||no||yes||N/A||no|
|Maproulette||World/Partial||Many (10+)||One feature at time||no||yes||yes||no|
- Keep Right↙
- Keep Right (keepright.at) shows a large number of automatically detected potential errors on a map or in list form. It has a system for reporting false positives and for labelling a bug as fixed. It has rules to automatically detect the following error types: non-closed areas, dead-ended one-ways, almost junctions, deprecated tags, missing tags, bridges/tunnels without layer (careful - not always an error), motorways without ref, places of worship without religion, POIs without name, ways without nodes, floating islands, un-tagged railway crossings, wrongly-used railway crossing tag, objects with FIXME=* tags, and relations without type.
- The bottom-right corner of the interface has links to data outputs, including GeoJSON.
- There is a documentation on how to solve keep-right-errors, currently only in German language: DE:Keep Right Users Guide though here is an auto-translation into English.
- Possible downsides: Keep Right shows tens of thousands of errors, including many that have little impact for most data uses (e.g. a stream intersecting a highway: technically some feature is needed here (a bridge, a culvert or a ford). Keep Right uses flawed assumptions about layers of bridges and tunnels sometimes leading to false or misleading error messages (discussion).
- Osmose (osmose.openstreetmap.fr) is a tool similar to Keep Right but offers even more error types. Obviously, this also includes smaller issues, like minor imprecisions or missing information that should be present in an ideal map.
- Reported by User: http://osmose.openstreetmap.fr/en/byuser/ then your user name
- JOSM Validator↙
- JOSM/Validator. A feature of JOSM that checks data loaded into the editor, highlights errors and warnings, and can (on request) perform some automatic fixes. By default, it checks all objects modified in that session (and also reports errors if the error wasn't introduced by the uploader, but merely touched), but the validator can also perform complete validations on the downloaded data.
- The Gary68 tools↙
- Gary68 has created a whole bunch of quality assurance tools. The tools are currently not maintained. Most of the tools are written in Perl (scripts for your computer – no web tools) and the source code of all Gary68 tools is published online. See also Category:gary68.
- WayCheck is a program which checks the OSM data (file) for open ends and crossings. The found positions must be evaluated by a user and he or she can correct the data in JOSM or Potlatch or post a mark in OpenStreetBugs. The WayCheck page lists reports generated by the program and any user is encouraged to run reports and correct errors listed on the page and its links. This is especially useful for the quality of routing related data.
- MotorwayCheck lists problems related to highway=motorway. Page also shows reports.
- osmdiff is a program which compares two OSM files and documents the changes in list and map form. Some reports can be seen here: osmdiff reports.
- unmappedplaces finds a list of potentially unmapped places. These are reported on the wiki page. The query can be run for other countries as well.
- Mapping Quality is the successor of unmappedplaces. See the wiki page for the results. You get automatic street directory, KPIs (numbers) per place, maps that show status and CSV files for further processing.
- SomeChecks performs some checks: One-way check, Roundabout check, Double-node check (ways), Area Check.
- Relation Diff - Differences in relations
- Relation Check
- OSM Inspector↙
- TIGER Edited Map↙
- Coarse Highway↙
- Ragged highways with few points (blog entry): Coarse Highways.
- OS Locator Musical Chairs↙
- Map of Turn Restrictions↙
- US Interstate refs↙
- US interstate refs List of ref numbers and corresponding OSM interstates.
- FR:Servers/layers.openstreetmap.fr provides a slippy map with image layers to help people find possible errors in the data with worldwide coverage. The service provides:>
- layers with roads/street …
- having no name
- no ref
- no one-way
- drawing fixmes and notes texts.
- This tool also generates half-transparent coloured layers showing administrative areas by admin_level, as well as other "political" areas (used in France for mapping electoral subdivisions, as well as intercommunal structures of cooperation that do not fit the hierarchy of admin levels, but used as well in other countries for similar non hierarchical administrative, judiciary and electoral boundaries). These coloured layers allow searching easily for missing/broken/incomplete/unclosed boundaries as well as overlapping/duplicate boundaries of the same type, or boundaries that are not tagged correctly to be found by querying the OSM database with simple filters (for example missing tag "boundary=administrative", missing or incorrect value in "admin_level=*").
- housenumbervalidator checks addr:* attributes for duplicate addresses, incomplete addresses, and possibly incorrect street names. Results are displayed on a slippy map. Currently validation is performed for Germany and Austria only, as there are some language-specific checks.
- Other similar address tools:
- Maproulette aka Remap-a-Tron↙
- Remap-a-Tron service, blog post and github – A customizable web application to crowd-source the fixing of specific mapping errors by randomly displaying an item of a specific type in potential need of fixing. Originally designed to highlight areas with ways deleted due to the license change, it is now expanding into a general front end for fixing identifiable problems. This service is also known as MapRoulette or maproulette.org.
- osmlab's to-fix↙
- netzwolf's opening_hours & co. map↙
-  - Check Opening_hours, Service_times...
- So that is what inaccessible road is!↙
- Routino error log↙
- Routino a router for OSM data can generate an error log file (when run with the --errorlog option) that lists problems found that could be data errors or Routino's limited understanding of the data and which may affect the ability to calculate valid routes. Since the purpose of the Routino error log is to find data that causes problems for Routino it does not mean that all reported items are data errors.
- Bicycle tags map↙
- Administrative Grenzen in OSM↙
- A map that compiles all the German boundaries within OSM and also visualizes errors (unclosed multipolygones) http://ags.misterboo.de
- Max Speed Overpass↙
- Max Speed Overpass is a web map that shows maximum speeds. The goal of this web map is to show max speed and edit this from this map using your favorite OSM editor. The data shown is always up to date because it uses overpass query.
- Relation Analyzer↙
- The Relation Analyzer (http://ra.osmsurround.org/) helps to view several quality-assurance-related aspects of relations: (amongst others) relation on a map with segments' start and end marked, warning if the relation has gaps accompanied by a list of the segments if there are gaps, a height profile, type of ways included. tags.
- Lyrk Unvollständige Adressen↙
- Improve OSM↙
- This set of tools from Telenav helps fix OSM based on the vast amounts of GPS data Telenav is gathering from their GPS Navigation & Maps - Scout App (blog post).
- This includes identification of potential missing roads, oneway streets and turn retrictions.
- The tools are available as a website and a JOSM plugin.
- Restriction Analyzer by MorbZ↙
- OSM Restriction Validator shows unnecessary restrictions and restrictions that block access to streets.
- OSM-Sidewalker by Mapbox↙
- Unmapped places↙
- Unmapped places is a bug tool done by neis-one.org which marks places without roads.
- Errors in Alternativas libres↙
- In download section of Alternativas libres you can find a text file that marks the errors detected when they do their maps for Garmin. It is divided by countries and information is updated daily.
- OSMsuspects! ↙
- Is OSM up-to-date? ↙
- Is OSM up-to-date looks for old and potentially outdated nodes and ways.
- ITO Map↙
- ITO Map is a map overlay service from ITO. The layers cover different data types: Barriers, Buildings and addresses, Car parks, Electricity distribution, Fixme, Former railways, Layers, Metro, Navigable waterways, Railways, Schools, Speed limits km/h, Speed limits mph, Tracktype, Unknown roads, Water.
- Pedestrian overlay ↙
-  – A map of pedestrian/walking data; useful when checking coverage or connectivity of pedestrian mapping.
- It aims to show pedestrian mapping coverage (how many of the pedestrian-taggable elements are tagged with pedestrian data); this may be useful to see how well an area is mapped for pedestrians.
- It also aims to give an idea of connectivity (how well elements are connected, i.e. whether pedestrian elements have nodes connected to each other via nodes, for example, sometimes pedestrian elements are mapped without showing how they connect, for example a path which connects to a sidewalk may not yet have a node connecting one another); this information may be helpful for those working on routing.
- OSRM debug option↙
- OSM Lane Visualizer↙
-  OSM Lane Visualizer is a tool to show several attributes of a highway, selected by a overpass query or by relation id.
In addition to the above error and bug reporting tools, there are a number of tools that allow you to spot erroneous changes and edits. For example if you are very familiar with an area and have thoroughly mapped it, you might want to follow all changes and verify that no unintended damage or vandalism has happened in the area. The Planet History includes all changes that have been made, but might not be as easy to use.
In case that a change is bad (by 'mistake' or vandalism) you can rollback the change.
- API v0.6 introduced the concept of changeset. This is a group of edits made by particular user, with a comment. Some new displays have been developed for the web front end:
- ITO world OSM Mapper↙
- Real-time change following↙
- Currently nearly the same content: List of OSM based Services#Live/real-time edits to OSM data
- History Browser↙
- virtuelle-loipe's History Browser with diff tool for single nodes/ways/relations (side by side comparison of two versions).
- Mapki's Deep Diff↙
- OSM Deep History↙
- OSM History Viewer (by PeWu)↙
- https://pewu.github.io/osm-history - diff tool for single nodes/ways/relations. Showing only the colour-coded changes in a list. A bookmarklet is available on the page.
- OSM History Viewer↙
- OSM Aware↙
- OSM Aware is a program (only Python source code, no web service anymore) to create KML files of OSM change positions.
- Historical Coverage↙
- Historical Coverage service creates animations of the historical development in a specific area. (service no longer active)
- UserActivity Statistics and maps of user activity in two OSM files. Possibly detect vandalism... Reports (for Germany) generated periodically.
- The WhoDidIt: OpenStreetMap Changeset Analyzer analyses what was changed in your area. You may need to select "month" or even "half a year" for the "age" parameter to see edits; display could take some seconds. Features an RSS feed to get informed about new changes.
- WTFPL licensed. At least two alternative versions exist. Longer description.
- Live implementations:
- RSS History Filter↙
- RSS History Filter filters out large changesets from RSS feeds generated from the OpenStreetMap history tab
- OSM control tool↙
- http://osmct.de – monitor free defined polygons and mail on changes. Only usable with (free?) registration?! (German language only)
- tyrasd's RSS feed link creator↙
- QA RSS feed links for several services can be generated for a self-defined boundingbox at tyrasd.github.io/osm-qa-feeds.
- tyrasd's Latest Changes service↙
- at https://tyrasd.github.io/latest-changes/ shows all recent changesets (within a week) which touched the current map area. Changed objects are highlighted in the map. The object highlight is changing colour (to less intense) with the age of the relevant changeset. Note that deleted objects and changesets with only deletes are not shown.
- achavi (Augmented Change Viewer) visualizes OpenStreetMap changes based on the Overpass API Augmented Delta (adiff) query. Supports continuous monitoring of an area of interest and visualizing single changesets (with some limitations).
- Overpass attic queries↙
- With Overpass' attic queries you can query the OSM data based on time – example for objects which existed at a specific point in time or that were edited during a period of time.
- OpenStreetMap Analytic Difference Engine↙
- The OpenStreetMap Analytic Difference Engine (also called "OSM Analytic Tracker" or OSMAT for short) continually analyses activity in a given region (depending on the level of activity, ranging up to small countries) and presents tag changes in fairly easy to digest lists, allowing experienced contributors to spot and react to mapping mistakes in their region within minutes. Also allows opening "diffmaps" (similar to achavi etc) for quick overviews of geometric changes. User Cascafico on his blog documents how to set up an instance on an OrangePI PC Singleboard computer.
- OSMarelmon - The OSM Relation Monitor↙
- OSMarelmon monitors relations of OpenStreetMap. Monitored relations are periodically checked and the changes are distributed via RSS feeds.
- Where are the new OSM Contributors?↙
- OSMCHA - OSM Changeset Analyzer↙
- OSMCha features an extensive changeset filtering including detecting suspicious edits.
- osm-suspicious by Pascal Neis for finding suspicious changesets.
- OSM Hall Monitor↙
- OSM Hall Monitor With OSM Hall Monitor, you can track edits made by specified users, made to specified objects, or made with certain tags. You can also enable notifications to receive emails when any of the flagged people or items are edited. Basic functionality for suspicious changeset monitoring is also included.
- OSM Edits Made With MAPS.ME ↙
-  With this tool you can see edits made with MAPS.ME. You can also see by country, by user, etc. open the objects in JOSM or Level0. etc. .
- Traffic Sign Tool↙
- Traffic Sign Tool - Assistant to get the right tags for German road signs.
- QualityStreetMap () is a large grid for coordinating mapping work. You can select a tile and mark it complete for a specific tag. The grid covers the whole world and any tag. To edit the grid you have to log in with your OSM account. Zoom in to see the grid (min zoom level 12). The service is in beta.
- Road lists↙
- Users in Germany requested different official lists: Straßenverzeichnis.
- Check The Monuments! More Quality for the Key Monument.
- Overpass turbo↙
- (Missing) Maxheight map↙
- The Maxheight Map (aka OSM Truck QA Map) (website) is a Overpass API-based browser tool which helps you check and improve truck relevant features in OSM. Besides identifying missing maximum height tags under (railway) bridges and tunnels, you can also validate existing tagging for maximum height, width, length and weight amongst others.
- OSM Quality Assurance Editor (by osmsurround)↙
- The OSM Quality Assurance Editor (website) helps to highlight (via Overpass API) missing data in several categories (tracks without tracktype tag, tracks without surface tag, streets without any sidewalk tag, ways without incline tag, ways without surface tag, ways without smoothness tag, buildings without address, residential without name) and allows to directly edit the objects via a built-in online editor.
To compare the use of a tag or to see typos, use these statistical tools. See also: Statistics.
- Taginfo is a system for finding and aggregating information about OSM tags and making it browsable and searchable.
- ITO Map↙
- TIGER fixup/250 cities#Maps - A coordinated push to fix some basic routing problems in the U.S.
- OSM QA App - allows you to lock areas so as to avoid conflicts when doing teamwork.
- Reports: Unmapped Places in Europe 11/2011 and in Germany 8/2010
- OSMatrix - overlay of OSM activities, data density, historical development and further indices.
- See also: Research
- SotM 2010 session: OpenStreetMap – Ready for business!
- Bachelor Thesis comparing OSM 2009 with Navteq datas (German)
- SOTM2010 - Logiball - OSM Spain vs. commercial data compare
- Report OSM Quality Evaluation in UK 7/2007
- OSM vs Cartociudad: A study of the quality of OpenStreetMap mapping for the city of Lleida. 8/2012 (Spanish)
- Paper in Transactions in GIS comparing OSM and the official Austrian reference graph in 12/2012