Mapping for Malaria Elimination

Visualize the mapping efforts of HOT and DigitalGlobe support of Malaria Elimination

🌍 https://labs.mapbox.com/malaria-mapping

📖 https://www.mapbox.com/blog/world-malaria-day

See the Tasking Manager to learn how you can help and finish mapping 500,000 km2!

Requirements

• SQLite 3
• tippecanoe
• Node 4

npm install .
npm install -g osm-qa-filter

Data Processing

You can find the data processing scripts in scripts.

cd ./scripts

1. Prepare the QA tiles extract for the affected regions

./download-extract.sh

2. Filter buildings using osm-qa-filter to limit it to buildings edited after 1st of July 2016.

osm-qa-filter \
    -m malaria.qa.mbtiles -o malaria_buildings.geojson \
    --filter '["all", ["has", "building"], [">=", "@timestamp", 1467331200]]'

3. Filter to the mapped area

./filter-area.js -i malaria_buildings.geojson -o malaria_buildings_filtered.geojson

4. Add the date as attribute to the features.

./day.js -i malaria_buildings_filtered.geojson -o malaria_buildings_day.geojson

5. Calculate centroids of all the buildings

./centroid.js -i malaria_buildings_day.geojson -o malaria_buildings_day_centroid.geojson

6. Encode vector tiles (polygons for high zoom levels and points for low zoom levels) and stitch them back together into a single MBTiles.

tippecanoe --layer malaria_building -o malaria_buildings.mbtiles --include "@day" --minimum-zoom=11 --maximum-zoom=13 < malaria_buildings_day.geojson
tippecanoe --layer malaria_building -o malaria_buildings_low.mbtiles --include "@day" --minimum-zoom=0 --maximum-zoom=10 < malaria_buildings_day_centroid.geojson
./patch.sh malaria_buildings_low.mbtiles malaria_buildings.mbtiles
echo "update metadata set value=0 where name = 'minzoom';" | sqlite3 malaria_buildings.mbtiles
rm malaria_buildings_low.mbtiles

7. Calculate buildings per day and total unique contributors

./building-totals.js -i malaria_buildings_day_centroid.geojson -o malaria_buildings_by_day.json
./contributor-totals.js -i malaria_buildings_day.geojson -o malaria_contributors.json

8. Upload the vector tiles to Mapbox Studio!

Generate Daily Statistics

You can find the data processing scripts in scripts.

cd ./scripts
./generate-day-stats.sh

This will generate a CSV file with daily statistics to show the progress.