This document summarizes Osmose-QA, an open-source tool for quality assurance of OpenStreetMap data. It uses analyzers running on the OSM database to detect issues. It can also integrate external open data sources like OpenData and Mapillary to identify discrepancies between OSM and other datasets. MapCSS is supported for writing validation rules, with the rules compiled and run by Osmose-QA. A common validation language and shared rule repository are proposed to improve collaboration.

1. Osmose-QA
OpenData, Mapillary and
MapCSS
SotM 2019-09-23 – Heidelberg
Frédéric Rodrigo – CC-by-sa
fred.rodrigo@gmail.com
osmose-contact@openstreetmap.fr

2. Osmose-QA
●
Frontend Web Site
– Map of issues
– API
●
Backend Analyzers
– SQL on OSM database
– OpenData
– Python check one object at time
– MapCSS mapcss2osmose

3. OpenData
●
Compare OSM vs
OpenData
– Missing in OSM
●
By ref
●
By proximity
– Updatable
– Missing in OpenData

4. OpenData
●
70 OpenData Set
supported
●
Mainly in France

5. OpenData
●
Require matching configuration
●
Open to contribution
●
Split QA and OpenData
●
Spread out OpenData Frontend
●
Idea of configuration wizard

6. Mapillary
●
Same approach as OpenData
●
Fetch from Mapillary Computer Vision AI
– Traffic Signs
– Street Objects
●
Compare with OSM
– Traffic sign effect
– Objects

7. Mapillary

8. MapCSS
●
Styling language
– Derived from Web CSS
– Competitor of CartoCSS
way[bridge!=no] {
width: 6;
color:#000080;
}

9. MapCSS Selectors
●
way[bridge!=no]
●
*[amenity=parking][fee=yes]
●
node[traffic_calming] < way[highway]
●
*[amenity=parking] area[amenity=parking]⊆
https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation

10. MapCSS Validator Implementation
●
JOSM
– Java Interpreter
●
MapRules
– JS Converter
●
Osmose-QA
– Python Compiler
– Partial: mono-term selector

11. MapCSS in Osmose-QA
●
New rules made in MapCss
●
Convert own rules
●
Use JOSM rules
– Complexity/rank filter
– Orthogonal ranking :
●
Possible improvement E/W/I
●
Possible issues level 1/2/3

12. MapCSS Validation Properties
way[cycleway][cycleway:right][cycleway:left] {
throwWarning: tr("{0} with {1} and {2}", "{0.key}", "{1.key}", "{2.key}");
group: "cycleway";
-osmoseItemClassLevel: "4030/40301/2";
-osmoseTags: list("cycleway", "fix:chair");
assertMatch: "way cycleway=a cycleway:right=b cycleway:left=c";
}

13. Common Validation Language
●
Tag validation
●
Topological relation
●
Geometrical relation
Programming language still required for complex check

14. A Common Repository ?
●
Curate rules together
●
Avoid duplicate
●
Design issues to resolve

15. Osmose-QA
http://osmose.openstreetmap.fr (o.osmfr.org)
https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation