OpenStreetMap
Editing multipolygons with JOSM and the Relation Toolbox-plugin
Апублікавана карыстальнікам pangoSE 27 Кастрычнік 2018 на мове EnglishI highly recommend this new video by Adam Franco: https://www.youtube.com/watch?v=x7SPb0JtheA
Good luck with adding polygons!
Абмеркаванне