在pykml中读取具有多个地标的kml文件

问题描述

在 pykml 中，我可以使用以下代码读取文件中的第一个地标:

In pykml, I can read the first placemark in a file using the following code:

 with open(filename) as f:
     pm = parser.parse(f).getroot().Document.Folder
     print "got :"
     print pm.Placemark.LineString.coordinates

如何将同一文件中的多个地标读入python中?

How can I read multiple placemarks in the same file into python?

推荐答案

假设所有地标都在一个文件夹中，这是一个更简单的解决方案:

An even easier solution, assuming all placemarks are in one folder:

from pykml import parser

with open(filename) as f:
  folder = parser.parse(f).getroot().Document.Folder

for pm in folder.Placemark:
  print(pm.name)

---

您还可以使用基础xml库lxml的功能来搜索地标元素.

---

You can also use features of the underlying xml library lxml to search for placemark elements.

from pykml import parser
from pykml.factory import nsmap

namespace = {"ns": nsmap[None]}

with open(filename) as f:
  root = parser.parse(f).getroot()
  pms = root.findall(".//ns:Placemark", namespaces=namespace)

  for pm in pms:
    print(pm.name)

如果您专门搜索具有Linestring子级的地标，则还可以使用xpath进行更复杂的搜索.

If you specifically search for placemarks that have a Linestring child, you can also use xpath for more sophisticated searches.

pms = root.xpath(".//ns:Placemark[.//ns:LineString]", namespaces=namespace)

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