SVG中的地理标识位置（GeoLocation / GeoTag） [英] Geographical identification location (GeoLocation/GeoTag) in SVG

问题描述

我的搜索结果

• 地理标签可用于元数据格式，例如（自己的作品）（公共领域）
  
>我找到的最先进的参考资料是都柏林核心DCMI-box 。




2000版





2000的版本是这样的：



 < Box name =公爵铜矿> 
< northlimit> -21.3< / northlimit> 
< eastlimit> 139.9< / eastlimit> 
<南极限> -21.4< /南极限> 
< westlimit> 139.8< / westlimit> 
<上限> 400< /上限> 
<下限> -100< /下限> 
< / Box> 
  

osgeo.org 援引DClite4G计划：



 < dct：spatial> 
< Box投影=EPSG：4326name =Geographic> 
< northlimit> 34.353< / northlimit> 
< eastlimit> -96.223< / eastlimit> 
< southlimit> 28.229< / southlimit> 
< westlimit> -108.44< / westlimit> 
< / Box> 
< / dct：spatial> 
  

他们也有 RDF列表



2006版





与 2006年都柏林核心DCMI-box 值www.dublincoregenerator.com/generator.html#openDCMIBoxrel =nofollow noreferrer>它们的生成器（点击DCMI-box）提示XML语法如下：

 <？xml version =1.0encoding =UTF-8？> 
< metadata 
 xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xmlns：dc =http://purl.org/dc /elements/1.1/
 xmlns：dcterms =http://purl.org/dc/terms/> 
 
< dcterms：spatial xsi：type =dcterms：Box> 
 name = france; northlimit = 55; 
 eastlimit = 10; 
 southlimit = 44; 
 westlimit = -5; 
投影= ESPXYZ; 
< / dcterms：spatial> 
 
< / metadata> 
  







I am wondering how to geotag SVG maps.

My search results

• Geotags are available in metadata formats such as Exif, XMP and GeoTIFF.
• There is even a geotag for SMS (based on "geo:" URI)
• But there is no geotags in SVG standard.
• And not found Exif/XMB/... in SVG (ExifTool does not support SVG)
• Not found standard to encode GeoLocation within filename
  (eg: RockwoodRural_geo_50.167958_-97.133185.svg)

• As GeoLocation can be embedded in XHTML/HTML, and SVG is also XML-based, thus use one of these tricks:

  <meta name="ICBM" content="50.167958, -97.133185">
  
  <meta name="geo.position"  content="50.167958;-97.133185"\>
  <meta name="geo.placename" content="Rockwood Rural"\>
  <meta name="geo.region"    content="ca-mb"\>
  
  <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
           xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">
     <geo:Point>
        <geo:lat>55.701</geo:lat>
        <geo:long>12.552</geo:long>
     </geo:Point>
  </rdf:RDF>
  
  <span class="geo">
     <span class="latitude">50.167958</span>
     <span class="longitude">-97.133185</span>
  </span>
  

My questions

1. Does someone has already GeoTagged an SVG image?
2. What XML tag to use?
3. Should I create a specific SVG tag and propose an RFC?
4. What do you advice?

My specific usage

For information, I am developing on my spare time a website for commons-based maps peer production: Lmap.org. I would like to embed the Geo-Location within the SVG code => The downloaded SVG maps will already contain all the Geo-Location data.

I think SVG GeoTagging could be interesting for maps and building representation, for instance:

• Paris Ring Road (SVG in Public domain)
  

• Greater Vancouver Regional District by TastyCakes on English Wikipedia (Own work) CC-BY-3.0
  

• Eiffel tower by Alexandre JABORSKA on Wikimedia Commons (Public domain)
  

解决方案

The most advanced reference I found is the Dublin Core DCMI-box.

2000 version

The 2000's version was something such :

<Box name="Duchess copper mine">
    <northlimit>-21.3</northlimit>
    <eastlimit>139.9</eastlimit>
    <southlimit>-21.4</southlimit>
    <westlimit>139.8</westlimit>
    <uplimit>400</uplimit>
    <downlimit>-100</downlimit>
</Box>

osgeo.org cite the DClite4G scheme :

 <dct:spatial>
  <Box projection="EPSG:4326" name="Geographic">
    <northlimit>34.353</northlimit>
    <eastlimit>-96.223</eastlimit>
    <southlimit>28.229</southlimit>
    <westlimit>-108.44</westlimit>
  </Box>
</dct:spatial>

They also have a list of RDF

2006 version

The 2006 Dublin Core DCMI-box values used with their generator (click on DCMI-box) suggest the XML syntax as follow :

<?xml version="1.0" encoding="UTF-8"?>
<metadata
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:dcterms="http://purl.org/dc/terms/">

<dcterms:spatial xsi:type="dcterms:Box">
  name=france;northlimit=55;
  eastlimit=10;
  southlimit=44;
  westlimit=-5;
  projection=ESPXYZ;
</dcterms:spatial>

</metadata>

you can naturally change the units.

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