Where do these numbers come from?
The metrics presented on this website are calculated weekly using the latest osm-qa-tiles. First, we determine whether an edit to OpenStreetMap is associated with YouthMappers by comparing the OSM metadata (time and username) against a roster of OSM usernames known to belong to YouthMappers. This can be done efficiently for the entire planet using the the tile-reduce framework. Next, identified edits are grouped by type and chapter to create visualizations and summary statistics of the total editing activity performed by YouthMappers.
The drop down list on the Activity Map contains all of the known usernames associated with YouthMappers who have made at least one edit to OSM. Most of this list comes from annual chapter surveys. Are you a YouthMapper and your username is not in the list, or you'd like to update it? Fill out this form to let us know!
YouthMappers with the Geometics Engineering Student's Association of Nepal mapping in Pokhara, Nepal.
Why not use Hashtags?
#youthmappers hashtag is automatically inserted into the changeset comment for many HOT tasks because the tasks are also YouthMapper projects.
Therefore, when any mapper participates in one of these tasks, they would be counted as a YouthMapper if we used changedset hashtags to identify mappers. If done this way, we find over 11,800 different mappers that have used the
This hashtag is therefore too noisy for these types of contributor-centric measures.
Additionally, edits by a YouthMapper are not limited to only HOT tasks. The metrics here aim to better understand the YouthMappers project as a whole: With its aim to
building mappers, not just maps. To help quantify this, we want to count all of the objects edited by YouthMappers, not just those that were edited as part
of specific tasks. We even find that some YouthMappers have no changesets with the
These are the reasons why the numbers reported here differ from the missing maps leaderboard.
Some mapping stories this dashboard can help tell
The University of Cape Coast Geographical Society
According the to the chapters page, The UCC Geographical Society YouthMappers Chapter has added over 533,000 buildings to the map. The most prominent spike in activity was in April 2017. Using the Chapter Activity Map, we can see that this spike in mapping activity involved a massive building mapping effort in Zimbabwe and Zambia.
The chapters page also shows this chapter has another sustained (smaller) spike in building mapping in October 2017. Using the Chapter Activity Map again, we can see that this was a lot of local mapping activity for this Chapter where they mapped many of the buildings in Cape Coast, Ghana. When you zoom in past zoom level 12, the map switches from a heatmap to the actual geometries. Lines (primarily roads) appear in blue and Polygons (primarily buildings and residential areas) appear in green.