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Transition Request for 2 FPWDs

From: Phil Archer <phila@w3.org>
Date: Wed, 4 Jan 2017 17:27:03 +0000
To: Philippe Le Hegaret <plh@w3.org>, Chairs <chairs@w3.org>
Cc: SDW WG Public List <public-sdw-wg@w3.org>
Message-ID: <d841b729-445f-526b-aa73-5afbd9a01f74@w3.org>

The Spatial Data on the Web WG would like to publish two (related) FPWD 
Notes (along with a couple of updated docs) tomorrow. These are part of 
the WG's work to address the charter deliverable 'Coverages in Linked 
Data' although the WG does not intend for these to become Recs as 
envisaged by the charter.

Both should go under the Data on the Web category under TR space (also 
relevant to Geospatial of course).

Doc title: Publishing and Using Earth Observation Data with the RDF Data 
Cube and the Discrete Global Grid System

URL: https://www.w3.org/TR/2017/NOTE-eo-qb-20170105/

Requested short URL: https://www.w3.org/TR/eo-qb/

Working Group decision:
https://www.w3.org/2016/12/15-sdw-minutes#eoqb (status section was 
updated as the resolution requires).

This document describes how dense geospatial raster data can be 
represented using the W3C RDF Data Cube (QB) ontology [vocab-data-cube] 
in concert with other popular ontologies including the W3C/OGC Semantic 
Sensor Network ontology (SSN) [vocab-ssn], the W3C/OGC Time ontology 
(Time) [owl-time], the W3C Simple Knowledge Organisation System (SKOS) 
[skos-reference], W3C PROV-O [prov-o] and the W3C/OGC QB4ST 
[vocab-qb4st]. It offers general methods supported by worked examples 
that focus on Earth observation imagery. Current triple stores, as the 
default database architecture for RDF, are not suitable for storing 
voluminous data like imagery derived from Landsat satellite sensors. We 
show how SPARQL queries can be served through an OGC Discrete Global 
Grid System for observations, coupled with a triple store for 
observational metadata. While the approach may also be suitable for 
other forms of coverage data, we leave the application to such data as 
an exercise for the reader.


Document title: QB4ST: RDF Data Cube extensions for spatio-temporal 

URL: https://www.w3.org/TR/2017/NOTE-qb4st-20170105/

Requested Short URL: https://www.w3.org/TR/qb4st/

Working Group decision:
https://www.w3.org/2016/12/15-sdw-minutes#qb4st (HTML errors have been 
fixed as noted in the resolution).

This document describes an extension to the existing RDF Data Cube 
ontology to support specification of key metadata required to interpret 
spatio-temporal data. The RDF Data Cube defines CodedProperties, which 
relate to a reference system based on a list of terms, QB4ST provides 
generalized support for numeric and other ordered references systems, 
particulary Spatial Reference Systems and Temporal Reference Systems. 
Although RDF Data Cube supports AttributeProperties for metadata of 
individual observations, the requirement is to specify such metadata per 
property, rather than for the entire observation, and thus allow 
different properties to use different spatial or temporal reference 
systems. QB4ST also provides for such properties to be defined for a 
ComponentProperty, or defined at the time of referencing that 
ComponentProperty in a ComponentSpecification. QB4ST is thus aimed at 
improving the scope and consistency of dataset metadata, and hence 
discovery and interpretation of spatio-temporal data through its 
spatio-temporal reference system and bounding values.


Phil Archer
Data Strategist, W3C

+44 (0)7887 767755
Received on Wednesday, 4 January 2017 17:27:18 UTC

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