https://youtu.be/x7SPb0JtheA

This is a brief overview of how I edit Open Street Map (OSM) to add adjoining land-cover areas as multipolygons with shared boundary ways to reduce duplication and overlapping ways.

The area I’m editing, is replete with examples of this type of mapping: https://www.openstreetmap.org/#map=14/44.0199/-73.1530

The tools used are:

• JOSM editor - https://josm.openstreetmap.de/
• “Relation Toolbox” JOSM plugin - https://wiki.openstreetmap.org/wiki/JOSM/Plugins/Relation_Toolbox

Documentation on MultiPolygons in the OSM wiki:

• https://wiki.openstreetmap.org/wiki/Multipolygon_Examples
• https://wiki.openstreetmap.org/wiki/Relation:multipolygon

I also have a video about debugging gaps in multipolygons: https://youtu.be/87nRQHuatOE