Beginners Guide 1.3
From OpenStreetMap Wiki
Creating/Editing OSM data
OSM's data is made from the following elements:
- Nodes: The dots that are used to mark specific locations (such as a post box). Two or more nodes are used to draw line segments.
- Ways: A list of nodes, displayed as connected line segments. They are used to create roads, paths, etc.
- Closed Ways: Closed ways are ways that go in a complete loop. They are used to create "areas," such as parks, lakes, islands or buildings.
- Relations: When ways are linked but do not represent the same physical thing, a relation is used to describe the role of each way. Relations are used to create map features. such as cycling routes, turn restrictions and areas that are not contiguous. A long way, such as an interstate or a state highway with multiple segments, should be grouped into a relation for that highway. Another example is a national park with several locations that are separate from each other. These also should be grouped into a relation.
- Beginners Guide 1.3.1 - General tips about converting a GPS trace into a normal curved section of road
All these elements can carry tags, describing name, type of road etc.
You have a choice of two main editors:
- Potlatch This is the easiest editor to get started with and is available directly from the 'edit' tab.
- JOSM This one is more powerful than Potlatch and is preferred by many experienced contributors but needs to be downloaded separately and takes a bit more effort to get started with.