Does osm2pgsql with flex output ignore nodes with no tags?

[iboates]

I have tried to simply dump every node into a single table called nodes:

function osm2pgsql.process_node(object)
    nodes:insert({
        tags = object.tags,
        geom = object:as_point()
    })
end

It seems that it only inserts a feature if it has at least one tag. I want to get every node with its id, even if it has no tags. Is this possible? I did not see anything about this in the docs.

A slightly related question is if I am able to insert the first and last nodes from every linestring, even if they have no tags?

It seems that I can get the nodes of a linestring with .nodes, but that only returns the osm id, not the point itself.

[joto]

You need the -x, --extra-attributes option to also get the non-tagged nodes, ways, and relations. But we aware that there are two orders of magnitude more untagged nodes than tagged nodes, so this will take a while.

There is currently no way to access the individual point geometries for way nodes. You'd have to use some trick like importing the linestring and using a trigger in the database to get the points from the linestring. Or, if you have a table with all nodes anyway, get them from there later.

Lastly here is a suggestion: Use the middle tables which osm2pgsql will create for you in --slim mode instead of your nodes table. It will not have a geometry column, but lat/lon columns. But you can easily add a view adding the geometry with ST_MakePoint(). Depending on access patterns (indexes?) this might or might not work for you.

[joto]

Note that in newer versions of osm2pgsql untagged objects get their own processing functions, see here.