XML导入INSPIRE GIS数据层 [英] XML Import INSPIRE GIS Data Layer

问题描述

我有一个非常具体的数据导入问题，而且我对XML数据集还很陌生，所以我的问题很可能是由于我缺乏理解.我想阅读Deutsche Bahn的德语轨道网络，该网络已在此处公开发布: http: //data.deutschebahn.com/dataset/data-streckennetz (不幸的是，链接在德国)

I have a very specific data import problem and I am fairly new to XML data sets, so my problems are probably due to my lack of understanding. I would like to read in the German track network from Deutsche Bahn, which is published publically here: http://data.deutschebahn.com/dataset/data-streckennetz (link is in Germany unfortunately)

这将是直接链接: http://download- data.deutschebahn.com/static/datasets/streckennetz/INSPIRE_0618.zip

还有一个指向INSPIRE数据集的200页文档的链接，但它并不能真正帮助我理解解析XML文档. https://inspire.ec.europa.eu/documents/Data_Specifications/INSPIRE_DataSpecification_TN_v3.0.pdf

There is also a link to a 200 page document about the INSPIRE data set, but it does not really help me understand parsing the XML document. https://inspire.ec.europa.eu/documents/Data_Specifications/INSPIRE_DataSpecification_TN_v3.0.pdf

在一个上一个问题中，我得到了一个如何在各层中阅读的答案使用软件包sf

In a previous question, I got an answer how to read in the layers using the package sf

sf::st_layers("./DB-Netz_INSPIRE_20171116.xml")
nodes <- sf::st_read("./DB-Netz_INSPIRE_20171116.xml","RailwayNode")

除了一个"RailwayLinkSequence"，它适用于所有层

which worked for all layers but one "RailwayLinkSequence"

Link_Sequence<- sf::st_read("./DB-Netz_INSPIRE_20171116.xml","RailwayLinkSequence")

返回

Reading layer `RailwayLinkSequence' from data source `J:\Auswertungen Daten\R Beispiele\GIS\10 Data\DB_Inspire_XML_2015\DB-Netz_INSPIRE_20171116.xml' using driver `GML'
Error in (function (..., row.names = NULL, check.rows = FALSE, check.names = TRUE,  : 
  arguments imply differing number of rows: 1, 6, 5, 28, 99, 2, 19, 41, 11, 3, 65, 7, 4, 22, 20, 17, 38, 9, 15, 8, 13, 24, 49, 14, 42, 36, 51, 31, 12, 25, 60, 10, 18, 48, 104, 53, 23, 16, 26, 32, 119, 40, 47, 37, 21, 44, 39, 43, 52, 46, 27, 30, 63, 81, 54, 61, 59, 34, 35, 45, 56, 108, 64, 62, 68, 67, 57, 80, 55, 29, 123, 88, 85, 33, 50, 96, 66, 79, 115
In addition: Warning message:
no simple feature geometries present: returning a data.frame or tbl_df 

有人暗示为什么st_read无法读取该层吗?

Does anybody have a hint why this layer cannot be read in with st_read?

推荐答案

使用xml2包:

> library(xml2)

读取文件:

> x=  read_xml("./DB-Netz_INSPIRE_20171116.xml")

在默认(d1)命名空间中找到所有RLS:

Find all the RLSs in the default (d1) namespace:

> f = xml_find_all(x, ".//d1:RailwayLinkSequence")

看看其中之一:

> f[123]
{xml_nodeset (1)}
[1] <RailwayLinkSequence gml:id="LSeq-1829209">\n  <gml:identifier codeSpace= ...

有几个?

> length(f)
[1] 7072

第123个RLS的localId值是多少?

What's the localId value for the 123rd RLS?

> xml_find_all(f[123], ".//base:localId")
{xml_nodeset (1)}
[1] <base:localId>LSeq-1829209</base:localId>

此RLS中包含哪些DirectedLink对象:

What are the DirectedLink objects contained in this RLS:

> xml_find_all(f[123], ".//net:DirectedLink")
{xml_nodeset (36)}
 [1] <net:DirectedLink>\n  <net:direction>+</net:direction>\n  <net:link xlin ...
 [2] <net:DirectedLink>\n  <net:direction>+</net:direction>\n  <net:link xlin ...
 [3] <net:DirectedLink>\n  <net:direction>+</net:direction>\n  <net:link xlin ...
 [4] <net:DirectedLink>\n  <net:direction>+</net:direction>\n  <net:link xlin ...
 [5] <net:DirectedLink>\n  <net:direction>+</net:direction>\n  <net:link xlin ...
 [...]

了解有关使用xml2进行XML解析的更多信息，您将必须弄清楚如何提取出于自身目的所需的部分.但我希望这会有所帮助.

Learn some more about XML parsing using xml2 and you'll have to work out how to extract the parts you need for your own purposes. But I hope this helps.

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