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立交桥API中的“节点”和“方式”是什么

[英]What are “Nodes” and “Ways” in overpass API

I'm using overpass api and would like to understand the difference between a Node and a Way . 我正在使用overpass api,并希望了解NodeWay之间的区别。 Below is an xml snippet for each. 下面是每个的xml片段。 I would appreciate if anyone knew what the number values mean and how they relate to the real world. 如果有人知道数字值的含义以及它们与现实世界的关系,我将不胜感激。 Also what is the difference between a node with tags and one without. 带有标签的节点和没有标签的节点之间的区别是什么。

<way id="4600886">
  <nd ref="27605443"/>
  <nd ref="30346321"/>
  <nd ref="1705297211"/>
  <nd ref="391210257"/>
  <nd ref="390384217"/>
  <nd ref="391210271"/>
  <nd ref="32343771"/>
  <nd ref="391210305"/>
  <nd ref="391210664"/>
  <nd ref="97175448"/>
  <tag k="highway" v="secondary"/>
  <tag k="lanes" v="2"/>
  <tag k="name" v="Days Road"/>
  <tag k="surface" v="asphalt"/>
</way>


<node id="18615430" lat="44.2384337" lon="-76.5411605">
  <tag k="created_by" v="r_coastlines"/>
  <tag k="source" v="PGS"/>
</node>

First of all, this question is not at all about Overpass API - that's the normal OpenStreetMap object model with nodes, ways and relations. 首先,这个问题根本不是关于Overpass API - 这是具有节点,方式和关系的普通OpenStreetMap对象模型。

The ref values as such don't have any meaning, they're database internal object ids. 这样的ref值没有任何意义,它们是数据库内部对象id。 However, A way may reference a node via its id as an example. 但是,A方式可以通过其id引用节点作为示例。 Geographic lat/lon information is always stored in nodes. 地理纬度/经度信息始终存储在节点中。 And of course, some nodes may have tags, if they represent a node-like object in real life (could be an amenity or maybe a stop-sign). 当然,如果某些节点在现实生活中代表一个类似节点的对象(可能是舒适性或者可能是停止标志),它们可能会有标签。 For a highway (=way which uses a number of nodes), the individual nodes don't need to have any tag at all. 对于高速公路(=使用多个节点的方式),各个节点根本不需要任何标记。

Some recommended reading: 一些推荐阅读:

  1. http://wiki.openstreetmap.org/wiki/Elements http://wiki.openstreetmap.org/wiki/Elements
  2. http://wiki.openstreetmap.org/wiki/OSM_XML http://wiki.openstreetmap.org/wiki/OSM_XML
  3. http://wiki.openstreetmap.org/wiki/OSM_file_formats http://wiki.openstreetmap.org/wiki/OSM_file_formats
  4. https://www.mapbox.com/mapping/osm-data-model/ https://www.mapbox.com/mapping/osm-data-model/

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