WGS 84 Geographic Point URI Space

This version:
http://placetime.com/2003/05/geopoint-wgs84-20030516
Latest version:
http://placetime.com/geopoint/wgs84/
Previous version:
http://placetime.com/2003/05/geopoint-wgs84-20030513
Authors:
Ian Davis
Chris Goad

Abstract

This is a specification of a URI space representing points on Earth according to the World Geodetic System 1984 (WGS 84) .

Status

This URI space is EXPERIMENTAL and may be subject to change in the future. Please do not rely on the existence of any URIs in this space for production works.

Contents

WGS 84

WGS 84 is an earth fixed global reference frame, including an earth model. See WGS 84 for more information about this reference scheme.

URI syntax

URIs in this space take the general form:

http://placetime.com/geopoint/wgs84/XxxYyy

Where:

X
Literal text denoting the start of the X or longitude component of the URI
xx
A decimal number representing the X or longitude component of the URI. This may be prefixed with a - character to indicate numbers less than zero. The valid range of numbers is -180.0 to 180.0
Y
Literal text denoting the start of the Y or latitude component of the URI
yy
A decimal number representing the Y or latitude component of the URI. This may be prefixed with a - character to indicate numbers less than zero. The valid range of numbers is -90.0 to 90.0

Retrievability

All URIs in this space are retrievable via the HTTP protocol.

Content negotiation using the HTTP Accept: header is performed to determine the appropriate representation format.

Currently HTML and RDF representations are provided. These can be addressed individually by appending .html or .rdf to the URL used to retrieve the representation. For example an HTML representation of the URI

http://placetime.com/geopoint/wgs84/X-126.817Y46.183

may be obtained by issuing an HTTP GET on the following URL:

http://placetime.com/geopoint/wgs84/X-126.817Y46.183.html

and the corresponding RDF representation using this URL:

http://placetime.com/geopoint/wgs84/X-126.817Y46.183.rdf

Representations

The RDF representation of URIs in this space utilise the RDFIG Geo vocab. Each URI represents a Point in this vocabulary. Sample RDF output is:


<rdf:RDF
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
  xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#"
  xmlns:dc="http://purl.org/dc/elements/1.1/">
  <geo:Point rdf:about="http://placetime.com/geopoint/wgs84/X-126.817Y46.183">
    <dc:description xml:lang="en-GB">The point at latitude 46.183 and longitude -126.817 in the WGS 84 datum.</dc:description>
    <geo:lat>46.183</geo:lat>
    <geo:long>-126.817</geo:long>
  </geo:Point>
</rdf:RDF>

Examples

http://placetime.com/geopoint/wgs84/X-126.817Y46.183
A geographic point on the Earth's surface representing a longitude of -126.81 degrees and a latitude of 46.183 degrees.