Idea: add function to sum up spatial length of ways

[saerdnaer]

like the experimental count function but not the number of elements but the spatial length of non-closed ways.

[drolbr]

Implemented in 0762e15

Syntax is: length() as evaulator. An example:

way[name="Wilhelm-Stricker-Weg"];
out geom;
make stats length=sum(length()),section_lengths=set(length());
out;

[tordans]

Update: Have a look at tyrasd/osmtogeojson#130 for my latest workaround.

---

In case anyone stumbles upon this.

I was wondering how to connect the list of length values from section_lengths to the OSM ways.

Here is my workaround: https://overpass-turbo.eu/s/1buu

[out:json][timeout:25];
(
  way["highway"="service"]({{bbox}});
);
out geom;
make stat total_length=sum(length()),way_id_length=set(type() + ",#" + id() + ",length(m):" + length());
out;

Which returns a string that can be processed to get the length per way-id.

{
  "type": "stat",
  "id": 1,
  "tags": {
    "total_length": "58.626",
    "way_id_length": "way,#262073667,length(m):18.509;way,#262073675,length(m):40.117"
  }
}

Another way would be to trust in the fact(?) that the order of all values of make-variable(ids, lengths) is the same, so make test ids=set(id()),lengths=set(length()); could be used to split (by ;) and match by array index.

{
"type": "test",
"id": 1,
"tags": {
 "ids": "262073667;262073675",
 "section_lengths": "18.509;40.117"
}
}

Other thinks I learned:

• It looks like there is no way to add (merge) the length output to the elements-object of type:way; it is always separate from the OSM elements. Update: See Rolands reply below
• stats can be any string, its just the value for the "type": "stats".
• The variable names can have any value (length=sum(length()) could be total_length=…).
• One can access tags-values with t["highway"], but the result will be compacted.
• The way make is used above, one can only have on make-call.

[drolbr]

General remark: please do not comment on issues that are closed since years. Most likely, nobody will ever read that. Rather feel free to open a new issue for a remark.

For the given problem I suggest

[out:json];
way["highway"="service"]({{bbox}});
convert result ::=::,::geom=geom(),length=length();
out geom;

The convert statement amends each OSM element with a length tag. The result can be seen on this Overpass Turbo instance. The main instance does not support the produced GeoJson.

[DaveF63]

please do not comment on issues that are closed since years. Most likely, nobody will ever read that.

I disagree with this. Given software is updated, an original, accepted answer can often be wrong. Many come to these pages via a google search.

I came to this page via the 'Related Questions' column on the OSM help forum.