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13:00:23 <trackbot> Zakim, this will be SDW
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13:00:24 <trackbot> Meeting: Spatial Data on the Web Working Group Teleconference
13:00:24 <trackbot> Date: 10 August 2016
13:00:27 <kerry> present+ kerry
13:00:39 <billroberts> present+ billroberts
13:00:40 <kerry> chair: bill roberts
13:00:51 <billroberts> regrets+ scottsimmons
13:01:21 <dmitrybrizhinev> present+ dmitrybrizhinev
13:09:08 <roba> roba has joined #sdwcov
13:09:11 <sam> sam has joined #sdwcov
13:10:34 <billroberts> https://www.w3.org/2016/07/27-sdwcov-minutes
13:11:18 <billroberts> PROPOSED:approve minutes of last meeting
13:11:21 <roba> scribenick roba
13:11:26 <kerry> +1
13:11:36 <billroberts> +1
13:11:36 <dmitrybrizhinev> +1
13:11:41 <roba> scribenick: roba
13:11:51 <kerry> scribe: Rob Atkinson
13:12:03 <roba> +1
13:12:11 <billroberts> https://www.w3.org/2015/spatial/wiki/Patent_Call
13:12:24 <billroberts> RESOLVED: minutes approved
13:12:40 <billroberts> https://www.w3.org/2015/spatial/wiki/Meetings:Coverage-Telecon20160810
13:14:12 <dmitrybrizhinev> https://github.com/ANU-Linked-Earth-Data/ontology/blob/master/ANU-LED.owl
13:14:18 <billroberts> sam - we can see you are nearly on webex - dmitry will go first on his part of the work
13:14:18 <dmitrybrizhinev> https://github.com/ANU-Linked-Earth-Data/ontology/blob/master/ANU-LED-example.owl
13:17:16 <roba> dmitrybrizhinev: most of the work of defining a coverage compatible with way datacube works.
13:17:45 <roba> ...have defined subProperties of geo:location etc for cells
13:18:06 <roba> ...explained another DGGS example
13:18:29 <roba> ...support SPARQL queries over image metadata
13:18:36 <roba> q+
13:18:52 <billroberts> q+
13:19:48 <billroberts> roba: has also been looking at an ontology that builds on QB for spatial concepts
13:20:10 <kerry> roba asks about qb dimensions for basic geospatial concepts -- no problem with you defining lat/long in your own namespace and a broader one might be better
13:20:27 <kerry> dmitry: yes
13:20:54 <kerry> roba: a subproperty of WGS 84 CRS may not be a useful coord system
13:21:18 <kerry> dmitry: yes when there is a tem as advised by BP gropu we should subclass that
13:21:25 <kerry> roba; will suggest something tomorrow
13:21:28 <billroberts> ack r
13:21:32 <billroberts> ack b
13:22:16 <kerry> billroberts: this is and rdf approach top tiliing, with metadata in rdf, is a way towards metadata discovery.
13:22:17 <roba> bill: is an RDF approach to tiling
13:22:29 <kerry> ...are you looking for a rdf version of what is in the image?
13:22:37 <roba> kerry cant help scribing :-)
13:23:57 <kerry> q?
13:24:02 <kerry> q+
13:24:09 <roba> dmitrybrizhinev: SSN has capabilities?
13:24:11 <billroberts> ack k
13:25:26 <roba> kerry: featureofinterest missing in example - what is it for coverage
13:28:30 <roba> kerry: we should ask Peter Baumann
13:29:31 <roba> roba: feature of interest is the thing that has a property whose value is the coverage range (i think)
13:30:17 <roba> kerry: deployment metadata would be useful
13:30:50 <roba> ...use PROV to talk about processing
13:31:07 <roba> what is on coverage BP scope/
13:32:36 <billroberts> roba: feels that current practices for describing coverage metadata is not good enough
13:36:48 <sam> q+
13:37:01 <roba> roba: suggests we focus primarily on describing the spatio-temporal aspects of coverages
13:37:20 <billroberts> ack sam
13:37:20 <roba> ...including the "range envelope"
13:38:16 <roba> sam: RDF QB not designed for serialising dense grids - but useful for description
13:38:40 <roba> ...materialising subset over the wire may be useful though
13:39:41 <roba> sam: experience/experiment? is storing data in HDF
13:40:14 <roba> ...serving in RDF
13:40:43 <roba> use case is also describing any access method - e.g. WCS
13:42:54 <roba> roba: have you done anything reasoning over descriptions?
13:43:05 <roba> sam: not yet
13:43:31 <kerry> q+
13:43:37 <billroberts> ack q
13:43:40 <billroberts> qxk k
13:43:46 <billroberts> ack kerry
13:48:21 <kerry> q+
13:48:40 <billroberts> ack k
13:51:53 <dmitrybrizhinev> roba: is it reasonable to ask the user "figure out on your own how to write the query that will give you the metadata you want?"
13:52:39 <dmitrybrizhinev> What I want is give me the entire graph of your metadata, but without the metadata, as a thing
13:52:56 <dmitrybrizhinev> roba: What I want is give me the entire graph of your metadata, but without the data, as a thing
13:53:36 <dmitrybrizhinev> kerry: "something like select * ?"
13:53:56 <dmitrybrizhinev> roba: You might be able to find a best practice, but there needs to be a shortcut, a best practice
13:54:07 <dmitrybrizhinev> roba: You might be able to find a pattern, but there needs to be a shortcut, a best practice
13:54:34 <dmitrybrizhinev> billroberts: This is why we need a well defined data model
13:54:46 <dmitrybrizhinev> billroberts: ... so the common tasks for the user are simple
13:55:37 <dmitrybrizhinev> roba: it's nice having a data model with both data and metadata, but it makes it harder to say "give me all the metadata without the data"
13:55:53 <dmitrybrizhinev> roba: so we need a best practice to say that the metadata on its own should be easily accessible
13:56:14 <dmitrybrizhinev> roba: have a data model that can support both description and serialisation
13:56:38 <kerry> q+
13:57:03 <dmitrybrizhinev> roba: have a look at the existing working group requirements, maybe we need to define a new one
13:57:14 <dmitrybrizhinev> sorry, I keep making errors
13:57:22 <dmitrybrizhinev> billroberts: have a look at the existing working group requirements, maybe we need to define a new one
13:58:29 <dmitrybrizhinev> roba: I'll take an action to write up a usecase for rdf metadata description
13:58:43 <billroberts> ack k
13:59:05 <dmitrybrizhinev> roba: I want prov, I want SSN, I want that extensible description
13:59:20 <dmitrybrizhinev> kerry: one of my favourite things about rdf is it doesn't distinguish between data and metadata
13:59:29 <dmitrybrizhinev> kerry: you can treat it as a view of the data
13:59:43 <dmitrybrizhinev> roba: yes I would treat it as a view of the data, but the way to do this is not yet standard
14:00:09 <dmitrybrizhinev> billroberts: please write up examples of some of the things you would want to retrieve
14:01:43 <roba> maybe - maybe thats an implementation detail ?
14:02:13 <kerry> +1 and me too
14:04:09 <billroberts> RRSAgent, draft minutes
14:04:09 <RRSAgent> I have made the request to generate http://www.w3.org/2016/08/10-sdwcov-minutes.html billroberts
14:04:18 <billroberts> thanks bye
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