在iD编辑器的菜单栏选“地图数据”勾选“测量面板，就可以一边画一边实时看到当前画线的长度，闭合路径（区域）的周长与面积。

Thanks to imagico for the introduction to the discussions at github.

I also know that most of these issues have already been discussed, however, I’m not optimistic about when these discussions will be taken up.

On the other hand, as you probably know, some mappers may suspect that they have made a mistake in their mapping if the submitted data isn’t rendered, and may even change the tags to something else that doesn’t fit, but rendered, to make them stand out on the Carto layer. Therefore, before these rendering ”features“ of Carto layers are changed, I would like to use this article to list such cases in Chinese, so that the Chinese community can be aware that these cases are caused by Carto layers, and to remind me and everyone else pay attention to and avoid possible ”tagging for the renderer“.

(The above is a machine translated version of the following Chinese.)

谢谢imagico对在github讨论的介绍。

我也知道这些问题大都已有讨论，然而，对于这些讨论何时能被采纳，我并不乐观。

另一方面，您大概也知道，某些绘图者可能会因为提交的数据不渲染而怀疑自己绘制有错，乃至改成别的并不贴切但能渲染的标签以使之在Carto图层上醒目。因此，在Carto图层的这些渲染“特性”被变更之前，我想通过这篇文章用中文罗列此类情况，让中文社区注意到，这些情况都是Carto图层导致的，提醒我和大家关注和避免可能的”面向渲染绘图“。

（上边的英文是这几句话的机翻）

很有指导性的文章！ 另外我最近遇到了一个相关问题，想顺便请教一下：我注意到除了作为admin_center的place=city以外，还有的市县标注了标签为place=region/county的POI，并作为label加入关系。而有的市县却没有这个POI。请问是否应该都标注place=region/county，如果不是，标与不标参考什么标准好呢？