I'm using osmar package with R but I would like to understand some outputs.
In general I would like to understand these outputs:
ua$nodes$attrs
ua$nodes$tags
ua$ways$attrs
ua$ways$tags
ua$ways$refs
ua$relations$attrs
ua$relations$tags
ua$relations$refs
in particular this one: ua$nodes$attrs
ua$nodes$attrs
id visible timestamp version changeset user uid lat lon
1 4610337290 true 2017-01-15 20:08:26 1 45198454 Michele Aquilani 3860151 41.87560 12.48151
2 1168031316 true 2015-01-27 12:21:52 3 28440993 Dinamik 39040 41.87572 12.48203
3 470954078 true 2009-08-19 11:42:50 1 2199720 GPS-Marco 110076 41.87548 12.48150
4 302148972 true 2010-10-07 14:57:51 2 5978872 dieterdreist 26139 41.87555 12.48166
...
Someone can help me?
Tnx
Many of these attributes are explained here.
Let's take the first entry as an example: node 4610337290.
id is the unique identifier of this element. Each element (node, way, relation) in OSM has a unique ID, although these IDs are only unique within the element type. This means there can be a node having the same ID as a way or relation.
visible shows whether this node has already been deleted. Deleted nodes remain in the database, including their full history.
timestamp is the time of the last modification to this node.
version is the current version number of this node. Each modification leads to an increased version number.
changeset is the identifier of the last changeset that modified this element, in this case changeset 45198454. A changeset can contain modifications to more than one element.
user is the OSM user name of the user responsible for the last changeset to this node.
uid is the unique identifier of the user.
lat and lon are the latitude and longitude of the node.