A geographic information notation using SVG and RDF compatible metadata
Contents
Extended support for ISO6709 by basic geo vocabulary
<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:iso6709>+26.2256+127.6853/</geo:iso6709>
</geo:Point>
</rdf:RDF>
With Coordinate Reference Systems
<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:iso6709>+26.2256+127.6853CRSWGS84/</geo:iso6709>
</geo:Point>
</rdf:RDF>
RDF geo metadata embedded in SVG
<?xml version="1.0" encoding="UTF-8" ?>
<svg
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" >
<metadata>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" >
<rdf:Description rdf:about="#p1">
<dc:spatial rdf:type="geo:Point" geo:iso6709="+26.2256+127.6853/"/>
<dc:type>bank</dc:type>
</rdf:Description>
<rdf:Description rdf:about="#p2">
<dc:spatial rdf:type="geo:Point" geo:iso6709="+26.2226+127.6823/"/>
<dc:type>market</dc:type>
</rdf:Description>
</rdf:RDF>
</metadata>
<defs>
<g id="icon1">
<circle cx="0.0" cy="0.0" r="10" fill="green" stroke="none" />
</g>
<g id="icon2">
<rect x="-10" y="-10" width="20" height="20" fill="blue" stroke="none"/>
</g>
</defs>
<use x="50" y="70" xlink:href="#icon1" id="p1" />
<use x="20" y="40" xlink:href="#icon2" id="p2" />
</svg>
Relationship to geographic coordinates of SVG
The following SVG content with geographic coordinate metadata
<?xml version="1.0" encoding="UTF-8" ?>
<svg
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" >
<metadata>
<rdf:RDF
xmlns:crs="http://www.ogc.org/crs"
xmlns:svg="http://www.w3.org/svg"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description>
<crs:CoordinateReferenceSystem rdf:resource="http://purl.org/crs/84" svg:transform="matrix(10000,0,0,-10000,-1276803,262326)" />
</rdf:Description>
</rdf:RDF>
</metadata>
<defs>
<g id="icon1">
<circle cx="0.0" cy="0.0" r="10" fill="green" stroke="none" />
</g>
</defs>
<use x="50" y="70" xlink:href="#icon1" id="p1" />
</svg>
can be interpreted as
<?xml version="1.0" encoding="UTF-8" ?>
<svg
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" >
<metadata>
<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 rdf:about="#p1" geo:iso6709="+26.2256+127.6853/" />
</rdf:RDF>
</metadata>
<defs>
<g id="icon1">
<circle cx="0.0" cy="0.0" r="10" fill="green" stroke="none" />
</g>
</defs>
<use x="50" y="70" xlink:href="#icon1" id="p1" />
</svg>
since
Order of CRS:84 is (Longitude , Latitude). matrix(a,b,c,d,e,f) svgX = a * Longitude + c * Latitude + e svgY = b * Longitude + d * Latitude + f 50 = 10000 * 127.6853 - 1276803 70 = -10000 * 26.2256 + 262326
A vocabulary for Spatial Network
- Straightforward application of network structure of RDF, as geographic network
- Make relationship with SVG Basic Shapes and it
Classes
Name |
Sub-class of |
Explanation |
ug:Node |
geo:SpatialThing |
spatial Node (point, vertex) object class |
ug:Link |
geo:SpatialThing,rdf:Statement |
spatial Link (arc, edge, span, line, chain) object class |
Properties for connection
Name |
Domain |
Range |
ug:linkTo |
ug:Node |
ug:Node |
rdf:subject |
ug:Link |
ug:Node |
rdf:object |
ug:Link |
ug:Node |
ug:length |
ug:Link |
Properties for inclusion
Name |
Domain |
Range |
ug:hasPart |
geo:SpatialThing |
geo:SpatialThing |
ug:isPartOf |
geo:SpatialThing |
geo:SpatialThing |
Inference rules
The ug:Link resource is generated by the reification of the statement with ug:linkTo predicate.
1:
From
<#Node1> ug:linkTo <#Node2>.
Followings are inferable,
- _:l1 a ug:Link.
_:l1 rdf:subject <#Node1>.
_:l1 rdf:object <#Node2>.
2:(Reverse of rule1)
From
<#Link1> a ug:Link.
<#Link1> rdf:subject <#Node1>.
<#Link1> rdf:object <#Node2>.
Followings are inferable,
<#Node1> ug:linkTo <#Node2>.
See also page 15 and 21 of http://www.w3.org/2006/02/slides/takagi.ppt.
Semantic Web GIS
The information system that processes the GeoMetadataOverSvg data might be called Semantic Web GIS.
- Machine-understandable geographics information is embedded in the presentation data for geographic information as metadata little by little.
- Typical format of the presentation data for geographic information will be SVG.
- Typical format of the machine-runderstandable data for geographic information will be geo metadata.
Easy metadata notation for SVG
Metadata elements may increase the data size and complicate the data structure of SVG content. Furthermore, the notation of the metadata based on RDF/XML will accelerate it further. Then, the simple notation for the metadata and RDF data structure equivalent to it are examined.
<?xml version="1.0" encoding="UTF-8" ?>
<svg
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#"
xmlns:dc="http://purl.org/dc/elements/1.1/" >
<defs>
<g id="icon1">
<circle cx="0.0" cy="0.0" r="10" fill="green" stroke="none" />
</g>
</defs>
<use id="p1" x="50" y="70" xlink:href="#icon1"
geo:iso6709="+352139+1384339+3776/"
dc:title="Mount Fuji" />
</svg>
is equivalent to
<?xml version="1.0" encoding="UTF-8" ?>
<svg
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" >
<metadata>
<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#"
xmlns:dc="http://purl.org/dc/elements/1.1/" >
<rdf:Description rdf:about="#p1"
geo:iso6709="+352139+1384339+3776/"
dc:title="Mount Fuji" />
</rdf:RDF>
</metadata>
<defs>
<g id="icon1">
<circle cx="0.0" cy="0.0" r="10" fill="green" stroke="none" />
</g>
</defs>
<use id="p1" x="50" y="70" xlink:href="#icon1" />
</svg>