From OpenStreetMap

Creating/Editing OSM data

OSM's data is made up from the following elements:

• Nodes: The dots that are used for drawing segments between.
• Ways: An ordered list of nodes, displayed as connected by line segments in the editor.
• Closed Ways: Closed ways are ways which go in a complete loop. They are used to describe areas like parks, lakes or islands.

As a Beginners Guide, here is how to create a normal curved section of road. There are a few simple techniques. The following is a simple way to get started with the various methods of editing:

1. Editing off-line with JOSM
2. Editing on-line with Potlatch
3. Merkaartor

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