Error categories
· Afrikaans · Alemannisch · aragonés · asturianu · Aymar aru · azərbaycanca · Bahasa Indonesia · Bahasa Melayu · bamanankan · Bân-lâm-gú · Basa Jawa · Basa Sunda · Baso Minangkabau · bosanski · brezhoneg · català · čeština · corsu · dansk · Deutsch · eesti · English · español · Esperanto · estremeñu · euskara · français · Frysk · Gaeilge · Gàidhlig · galego · Hausa · hrvatski · Igbo · interlingua · Interlingue · isiXhosa · isiZulu · íslenska · italiano · Kiswahili · Kreyòl ayisyen · kréyòl gwadloupéyen · kurdî · Latina · latviešu · Lëtzebuergesch · lietuvių · Limburgs · magyar · Malagasy · Malti · Nederlands · Nedersaksies · norsk · norsk nynorsk · occitan · Oromoo · oʻzbekcha/ўзбекча · Plattdüütsch · polski · português · română · shqip · slovenčina · slovenščina · Soomaaliga · suomi · svenska · Tagalog · Tiếng Việt · Türkçe · Türkmençe · Vahcuengh · vèneto · walon · Wolof · Yorùbá · Zazaki · isiZulu · српски / srpski · авар · Аҧсшәа · башҡортса · беларуская · български · қазақша · Кыргызча · македонски · монгол · русский · тоҷикӣ · українська · Ελληνικά · Հայերեն · ქართული · नेपाली · भोजपुरी · मराठी · संस्कृतम् · हिन्दी · অসমীয়া · বাংলা · ਪੰਜਾਬੀ · ગુજરાતી · ଓଡ଼ିଆ · தமிழ் · తెలుగు · ಕನ್ನಡ · മലയാളം · සිංහල · བོད་ཡིག · ไทย · မြန်မာဘာသာ · ລາວ · ភាសាខ្មែរ · ⵜⴰⵎⴰⵣⵉⵖⵜ · አማርኛ · 한국어 · 日本語 · 中文（简体） · 中文（繁體） · 吴语 · 粵語 · ייִדיש · עברית · اردو · العربية · پښتو · سنڌي · فارسی · ދިވެހިބަސް
Other languages — Help us translate this wiki
This page contains a list of typical geometric errors, how you can find those errors and how to correct them.
Table
| Picture | Category | Problem | How to find | How to correct | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Use of satellite images without offset correction. | Roads are offset away from tracks | Manually - download map and GPS data | Shift imagery until tracks will be matched.) Use an area with a high number of tracks for average things out, and spot GPS traces which had a bad fix. Then place objects according to the shifted imagery. | ||||||||||||
| Unconnected highway (touching) | This is a severe error when looking at routing applications. Connected roads are not connected in OSM data. | WayCheck by gary68 | Connect nodes in JOSM with merge function | |||||||||||||
| Unconnected highway (open) | This may be a severe error when looking at routing applications. Is the highway really just ending there? | WayCheck by gary68 | Connect nodes in JOSM with merge function. Or extend map. | |||||||||||||
|
Crossing on same layer without common node | Either bridge or tunnel and layer is missing or a common node is missing. Either reality is not reflected correctly or routing cannot be done correctly because roads are not connected in data. | Add layer information and bridge/tunnel information. Or create common node:
| |||||||||||||
|
Open areas | Reality is not reflected correctly and maybe some programs might have problems using those polygons. | areacheck.pl by gary68 | Close areas by prolonging the way. Last node has to be the same as the first. | ||||||||||||
|
Oneway errors on motorways | Imaging you are sitting in a car navigated by OSM using this data... | MotorwayCheck by gary68 | Correct tagging and/or direction of way. Josm reverse way i.e. | ||||||||||||
| Doubled nodes in ways | checkdouble.pl by gary68 | good question... | ||||||||||||||
|
Roundabouts with wrong direction | checkround.pl by gary68 | Reverse way with i.e. Josm or add oneway=-1 tag. | |||||||||||||
