如何从xml获取特定值并将其转换为GeoJSON
如何从xml获取特定值并将其转换为GeoJSON
提问于 2022-06-23 07:23:47
我正在尝试使用GeoJSON和xsl文件将一个xml文件转换为一个xsltproc文件。为此，我们试图转换xml文件和xsl文件。我想要做的是在xml中获取gen：22203-bldg-562的值，并将其放入id with-param中。我想把它放在with-param of id上。但是，当我进行转换时，我会得到以下错误。我想我有错误的方式来获得‘发电:价值’。我不知道如何访问gen:value。我该怎么办？
$ xsltproc style.xsl 52383622_bldg_6697_op.gml > index.geojson
XPath error : Undefined namespace prefix
xmlXPathEval: 1 object left on the stackxsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:core="http://www.opengis.net/citygml/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0"
xmlns:gml="http://www.opengis.net/gml" xmlns:str="http://exslt.org/strings" extension-element-prefixes="str">
<xsl:output method="text" indent="no" encoding="UTF-8" />
<xsl:template match="/">
<xsl:apply-templates select="/core:CityModel/core:cityObjectMember/bldg:Building" />
</xsl:template>
<xsl:template match="bldg:Building" />
<xsl:template match="bldg:Building[bldg:lod0FootPrint][bldg:measuredHeight]">
<xsl:apply-templates select="bldg:lod0FootPrint//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="bldg:Building[bldg:lod0RoofEdge][bldg:measuredHeight]">
<xsl:apply-templates select="bldg:lod0RoofEdge//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="bldg:Building[gen:stringAttribute]">
<xsl:apply-templates select="bldg:lod0RoofEdge//gml:Polygon">
<xsl:with-param name="id" select="string(gen:value)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="gml:Polygon">
<xsl:param name="z" />
<xsl:param name="id" />
<xsl:text>{"type":"Feature","properties":{"z":</xsl:text>
<xsl:value-of select="$z" />
<xsl:text>, "buildingId": </xsl:text>
<xsl:value-of select="$id" />
<xsl:text>},<xsl:text>
<xsl:text>"geometry":{"type":"Polygon","coordinates":[</xsl:text>
<xsl:for-each select=".//gml:posList">
<xsl:if test="position()!=1">,</xsl:if>
<xsl:text>[</xsl:text>
<xsl:variable name="t" select="str:split(.)" />
<xsl:for-each select="$t[position() mod 3 = 1]">
<xsl:variable name="i" select="position()" />
<xsl:if test="$i != 1">,</xsl:if>
<xsl:value-of select="concat('[',$t[$i*3-1],',',string(.),']')" />
</xsl:for-each>
<xsl:text>]</xsl:text>
</xsl:for-each>
<xsl:text>]}} </xsl:text>
</xsl:template>
</xsl:stylesheet>xml
<?xml version="1.0" encoding="UTF-8"?>
<core:CityModel xmlns:grp="http://www.opengis.net/citygml/cityobjectgroup/2.0" xmlns:core="http://www.opengis.net/citygml/2.0" xmlns:pbase="http://www.opengis.net/citygml/profiles/base/2.0" xmlns:smil20lang="http://www.w3.org/2001/SMIL20/Language" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:smil20="http://www.w3.org/2001/SMIL20/" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0" xmlns:uro="http://www.kantei.go.jp/jp/singi/tiiki/toshisaisei/itoshisaisei/iur/uro/1.4" xmlns:luse="http://www.opengis.net/citygml/landuse/2.0" xmlns:app="http://www.opengis.net/citygml/appearance/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0" xmlns:dem="http://www.opengis.net/citygml/relief/2.0" xmlns:tex="http://www.opengis.net/citygml/texturedsurface/2.0" xmlns:tun="http://www.opengis.net/citygml/tunnel/2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sch="http://www.ascc.net/xml/schematron" xmlns:veg="http://www.opengis.net/citygml/vegetation/2.0" xmlns:frn="http://www.opengis.net/citygml/cityfurniture/2.0" xmlns:gml="http://www.opengis.net/gml" xmlns:tran="http://www.opengis.net/citygml/transportation/2.0" xmlns:wtr="http://www.opengis.net/citygml/waterbody/2.0" xmlns:brid="http://www.opengis.net/citygml/bridge/2.0" xsi:schemaLocation="http://www.kantei.go.jp/jp/singi/tiiki/toshisaisei/itoshisaisei/iur/uro/1.4 http://www.kantei.go.jp/jp/singi/tiiki/toshisaisei/itoshisaisei/iur/schemas/uro/1.4/urbanObject.xsd http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd http://www.opengis.net/citygml/landuse/2.0 http://schemas.opengis.net/citygml/landuse/2.0/landUse.xsd http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd http://www.opengis.net/citygml/transportation/2.0 http://schemas.opengis.net/citygml/transportation/2.0/transportation.xsd http://www.opengis.net/citygml/generics/2.0 http://schemas.opengis.net/citygml/generics/2.0/generics.xsd http://www.opengis.net/citygml/cityobjectgroup/2.0 http://schemas.opengis.net/citygml/cityobjectgroup/2.0/cityObjectGroup.xsd http://www.opengis.net/gml http://schemas.opengis.net/gml/3.1.1/base/gml.xsd http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd">
<gml:boundedBy>
<gml:Envelope srsName="http://www.opengis.net/def/crs/EPSG/0/6697" srsDimension="3">
<gml:lowerCorner>34.93876102525376 138.77691876113923 100.941</gml:lowerCorner>
<gml:upperCorner>34.940826513994075 138.77930957077407 146.745</gml:upperCorner>
</gml:Envelope>
</gml:boundedBy>
<core:cityObjectMember>
<bldg:Building gml:id="BLD_5b633bbe-eee5-4070-8e1b-202b0c8645da">
<gen:stringAttribute name="建物ID">
<gen:value>22203-bldg-562</gen:value> // this <gen:value>
</gen:stringAttribute>
<gen:genericAttributeSet name="土砂災害警戒区域">
<gen:stringAttribute name="区域区分">
<gen:value>1</gen:value>
</gen:stringAttribute>
<gen:stringAttribute name="現象区分">
<gen:value>2</gen:value>
</gen:stringAttribute>
</gen:genericAttributeSet>
<bldg:class codeSpace="../../codelists/Building_class.xml">3001</bldg:class>
<bldg:measuredHeight uom="m">3.0</bldg:measuredHeight>
<bldg:lod0RoofEdge>
<gml:MultiSurface>
<gml:surfaceMember>
<gml:Polygon>
<gml:exterior>
<gml:LinearRing>
<gml:posList>34.939526582609396 138.77809852668528 126.612 34.93950339425915 138.77803651940917 126.612 34.93947843686556 138.77805028353634 126.612 34.939488015045036 138.77807589974992 126.612 34.93944985234779 138.77809694303997 126.612 34.939448517348794 138.77809335876165 126.612 34.93944036670756 138.77809785248826 126.612 34.93946410156609 138.7781613285196 126.612 34.93948566512662 138.77814943590874 126.612 34.93947687539607 138.7781259461289 126.612 34.939526582609396 138.77809852668528 126.612</gml:posList>
</gml:LinearRing>
</gml:exterior>
</gml:Polygon>
・
・
・回答 2
Stack Overflow用户
回答已采纳
发布于 2022-06-23 07:46:23
如果要在样式表中使用gen前缀，则需要将命名空间声明xmlns:gen="http://www.opengis.net/citygml/generics/2.0"添加到样式表中。
还要注意，xsl:template不允许xsl:with-param子级。
Stack Overflow用户
发布于 2022-06-23 10:07:38
我在这个xsl上取得了成功。
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:core="http://www.opengis.net/citygml/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0"
xmlns:gml="http://www.opengis.net/gml" xmlns:str="http://exslt.org/strings" extension-element-prefixes="str">
<xsl:output method="text" indent="no" encoding="UTF-8" />
<xsl:template match="/">
<xsl:apply-templates select="/core:CityModel/core:cityObjectMember/bldg:Building" />
</xsl:template>
<xsl:template match="bldg:Building" />
<xsl:template match="bldg:Building[bldg:lod0FootPrint][bldg:measuredHeight][gen:stringAttribute]">
<xsl:apply-templates select="bldg:lod0FootPrint//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
<xsl:with-param name="id" select="string(gen:stringAttribute)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="bldg:Building[bldg:lod0RoofEdge][bldg:measuredHeight][gen:stringAttribute]">
<xsl:apply-templates select="bldg:lod0RoofEdge//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
<xsl:with-param name="id" select="string(gen:stringAttribute//gen:value)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="gml:Polygon">
<xsl:param name="z" />
<xsl:param name="id" />
<xsl:text>{"type":"Feature","properties":{"z":</xsl:text>
<xsl:value-of select="$z" />
<xsl:text>, "buildingId": "</xsl:text>
<xsl:value-of select="$id" />
<xsl:text>"},</xsl:text>
<xsl:text>"geometry":{"type":"Polygon","coordinates":[</xsl:text>
<xsl:for-each select=".//gml:posList">
<xsl:if test="position()!=1">,</xsl:if>
<xsl:text>[</xsl:text>
<xsl:variable name="t" select="str:split(.)" />
<xsl:for-each select="$t[position() mod 3 = 1]">
<xsl:variable name="i" select="position()" />
<xsl:if test="$i != 1">,</xsl:if>
<xsl:value-of select="concat('[',$t[$i*3-1],',',string(.),']')" />
</xsl:for-each>
<xsl:text>]</xsl:text>
</xsl:for-each>
<xsl:text>]}} </xsl:text>
</xsl:template>
</xsl:stylesheet>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/72726113
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