info package osmar R

Question

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

Answer 1

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.

Answer 2

simple version:

it's the attributes of those who contributed to that project.

?osmar

yields:

nodes
     A list with two data frames containing the attributes and tags of the nodes.

basically the who/when/where on the edits made to the object.

for more, see the detailed documentation here.