Prerequisites: Opendata JOSM plugin, to open kml file in JOSM
- Run a overpass query to get the city boundary
- Export the data as `kml` file
- Open the `kml` in JOSM
- Download data from OSM-sidewalker onto a new layer
- Make the necessary changes
- Upload the changes
- Merge the completed task and the boundary `kml` into a single data layer
- Go ahead downloading another task area from OSM-sidewalker
- Once you are done repeat merging the uploaded layer with the earlier one
- This merged layer can be saved and reloaded to knnow the completeness of the quest