代码之家 › 专栏 › 技术社区 › maurobio

如何在Python中从KML文件中获取坐标列表

kml python

maurobio · 技术社区 · 9 年前

<?xml version="1.0"?><kml xmlns="http://earth.google.com/kml/2.1">
<Document>
<name>Test KML</name>
<description><![CDATA[<p>This is a test version.</p>]]></description>
<Style id="spstyle7">
    <IconStyle>
        <color>ff4DF6D8</color>
        <Icon><href>http://maps.google.com/mapfiles/kml/paddle/wht-blank.png</href></Icon>
    </IconStyle>
    <LineStyle>
        <color>ff4DF6D8</color>
        <width>4</width>
    </LineStyle>
</Style>
<Folder>
    <name>Track1</name>
    <visibility>0</visibility>
            <name>Test1</name>
            <description><![CDATA[test1]]></description>
            <Placemark>
                <name>test1</name>
                <description><![CDATA[test1]]></description>
                <MultiGeometry>
            <LineString>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                            11.000,4.000 11.000,3.000
                        </coordinates>
                    </LineString>
            <LineString>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                            11.000,4.000 12.000,4.000
                        </coordinates>
                    </LineString>
            <LineString>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                            12.000,5.000 12.000,4.000
                        </coordinates>
                    </LineString>
                </MultiGeometry>
            </Placemark>
</Folder>
<Style id="spstyle7">
    <IconStyle>
        <color>ff4DF6D8</color>
        <Icon><href>http://maps.google.com/mapfiles/kml/paddle/wht-blank.png</href></Icon>
    </IconStyle>
    <LineStyle>
        <color>ff4DF6D8</color>
        <width>4</width>
    </LineStyle>
</Style>
<Folder>
    <name>Track2</name>
    <visibility>0</visibility>
            <name>Test2</name>
            <description><![CDATA[test2]]></description>
            <Placemark>
                <name>test2</name>
                <description><![CDATA[test2]]></description>
                <MultiGeometry>
            <LineString>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                            8.000,8.000 8.000,7.000
                        </coordinates>
                    </LineString>
            <LineString>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                            8.000,7.000 11.000,6.000
                        </coordinates>
                    </LineString>
            <LineString>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                            9.000,1.000 10.000,1.000
                        </coordinates>
                    </LineString>
                </MultiGeometry>
            </Placemark>
</Folder>
</Document>
</kml>

协调标记,可以放入列表或列表列表(每个文件夹一个)。

首先,我编写了以下代码:

import xml.etree.ElementTree as ET
tree = ET.parse("test.kml")
root = tree.getroot()
results = root.findall('Folder')
textnumbers = [r.find('Placemark/LineString/coordinates').text for r in results]
print textnumbers

文件夹 名称,代码如下:

for folder in root.findall('Folder'):
    name = folder.find('name')
    print name

我还得到一个空字符串。为什么解析器没有找到标签有什么提示吗?

提前感谢您提供的任何帮助。

2 回复 | 直到 9 年前

maurobio 9 年前

事实上,我在这里找到了一个很好的解决方案: https://gis.stackexchange.com/questions/89543/get-points-from-a-kml-linestring

相应地修改我的代码:

import xml.etree.ElementTree as ET
tree = ET.parse("test.kml")
root = tree.getroot()

lineStrings = tree.findall('.//{http://earth.google.com/kml/2.1}LineString')

for attributes in lineStrings:
    for subAttribute in attributes:
        if subAttribute.tag == '{http://earth.google.com/kml/2.1}coordinates':
            print subAttribute.tag, subAttribute.text

其他可能的解决方案(未经测试)也可在此处找到: https://programmingadvent.blogspot.com.br/2013/06/kmzkml-file-parsing-with-python.html http://gsp.humboldt.edu/olm_2016/courses/GSP_318/04_3_2_Parsing_XML.html

Tomasz Plaskota 9 年前

你的根是 kml Document 假设的节点

当你这么做的时候 tree.getroot() 你抓住节点。在这种情况下,如果您只是将代码更改为包含 文件

实际上,唯一需要更改的行应该是:

result = root.findall('Document/Folder')