分离立交桥的前向和后向关系-api

Question

我需要从立交桥-api 获取一条特定public 运输线路的所有数据。假设它在我的城市有一个号码 148。

I use something like this example below 但这给了我前向和后向路线的组合方式。我怎样才能单独获得它们？

<osm-script output="json">
  <union>
    <query type="relation">
      <has-kv k="ref" v="148"/>
      <bbox-query s="54.21466404047702" w="18.270263671875" n="54.503143645746924" e="18.840179443359375"/>
    </query>
  
    <recurse type="down" />
  </union>

  <print mode="skeleton" order="quadtile"/>
</osm-script>

Answer 1

您可以按角色过滤： http://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#Recurse_.28n.2C_w.2C_r.2C_bn.2C_bw.2C_br.29

这是其他路线的例子，有前向和后向路线。

[out:json][timeout:25];

(
  //get relation
  relation["route"="bus"][ref=157]({{bbox}});

  // get ways with particular role
  way(r:"forward");

  // you may also add ways with empty role if you want
  // give role as an empty string
  //way(r:"");

  // get way nodes.
  // We can't use >; operator, because it will recurse to
  // all relation members.
  node(w);
);

out skel qt;

在 overpass-turbo 上试试： http://overpass-turbo.eu/s/a4F

分离立交桥的前向和后向关系-api

Separate forward and backward relation in overpass-api

gis

openstreetmap

overpass-api