[HOT] [#BaseRoadsVsOpenData] Progress report and call for contributions

Nicolas Decoster nicolas.decoster at mailbox.org
Sun Jun 16 16:58:18 UTC 2019

Hi all,

It has been 4 years since consolidated mapping projects confronting OpenStreetMap data against open data references ( # BaseRoadsVsOpenData) started. These projects aim to ensure some completeness, precision and consistency for a base roads network at a country scale, with the goal of encouraging OSM data reuse as a reference road network data source.
Over time, 9 projects have been opened on 9 west-african countries in coordination with local communities: Benin, Burkina Faso, Central African Republic , Guinea, Ivory Coast, Mali, Niger, Senegal, Togo.

Since 2015, OSM contributors have made significant progress but there is always work to do, a lot of work :) hence this call for contributions!

If you are interested, all project relative documentation is available on the OSM Wiki:  
Consolidated mapping projects - base roads check vs open data references (https://wiki.openstreetmap.org/wiki/Consolidated_mapping_projects_-_base_roads_check_vs_open_data_references ) .
Some  context elements, country based projects list with progress status, mapping instructions, etc.

Approach summary:
The main goal is to confront the country road network against an Open Data reference layer and improve its completeness and precision:
* The road reference data (like gROADS) is a hint that a road probably exists at a given place.
* An OSM mapper can then check if this road actually exists using some imagery and check the state of OSM for this road. If necessary, it can then update OSM to complete the road and improve its precision.
* It can also identify nearby information, like unmapped secondary roads or residential areas.
* It can also update the OSM road entity metadata to tell when imagery quality is not sufficient to properly identify the road (like vanishing tracks in desert).
To coordinate mappers and help prioritize tasks (as an exemple there are 2500 task for the Mali project), one uses:
* A project in a Tasking Manager which helps monitor completeness status. Each task area is a 500m buffer around the associated road in the reference data.
* Mali exemple: https://tasks.hotosm.org/project/813
* A priorisation uMap which identifies some tasks, in the Tasking Manager project, that may need more attention.
* Mali exemple: http://u.osmfr.org/m/232379/

Have a good day and good mapping!!

Nicolas Decoster, for the #BaseRoadsVsOpenData collective

PS: apologies if you receive this message multiple times (cross-posted on related countries mailing-lists and Talk-fr, HOT-fr and HOT mailing-lists)
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