pip install --upgrade kivy-garden
pip install concurrent requests
garden install --app mapview

python main.py yourgeojson.geojson

Or with a custom mbtiles:

python main.py -- -m custom.mbtiles yourgeojson.geojson

• double-click anywhere on the map to start creating a polygon

• then double-one click on the = one point into the polygon

• click-move on a dot = move a point of the polygon

• double-click on a dot = remove the dot

• click "Finish" to add the polygon back into the geojson

• double-click on a current geojson polygon to edit it

• click on Save to save the result into the loaded geojson