Re: [Bigdata-developers] Geonames and Blazegraph Geospatial index

[Jem R. <jem...@ft...>]

I guess I could invoke a sparql update as follows:

INSERT {
  ?s <http://jems/latlong> ?latlong
}
WHERE {
 ?s <http://www.w3.org/2003/01/geo/wgs84_pos#lat> ?lat ;
    <http://www.w3.org/2003/01/geo/wgs84_pos#long> ?long .
 BIND(STRDT(STR(CONCAT(?lat, "#", ?long)), <
http://jems/custom/latlong/literaltype>) AS ?latlong)
}

However this will create many millions of essentially redundant statements?

Question, re: multiple predicate index still stands.

Cheers
Jem


On 25 July 2016 at 15:14, Jem Rayfield <jem...@ft...> wrote:

> Hello,
>
> I would like to index geonames lat/long using Blazegraphs geospatial index.
>
> Geonames lat/longs are provided in the following flavour of RDF:
>
> <http://sws.geonames.org/4667981/> <
> http://www.w3.org/2003/01/geo/wgs84_pos#lat> "35.79787" .
> <http://sws.geonames.org/4667981/> <
> http://www.w3.org/2003/01/geo/wgs84_pos#long> "-83.44683" .
>
> I was wondering if anyone has already worked on Custom Geospatial Data
> types, vocabularies etc for Geonames in Blazegraph ?
>
>
> It appears that one would need flatten the objects into a single
> multidimensional literal for indexing?
>
> <http://sws.geonames.org/4667981/> somenamespace:latlong
> "35.79787#-83.44683"
>
> With the configuration and definition of a new literal type?
>
> I am wondering if its possible to index on multiple known predicates
> rather than multidimensional literals with extended data types?
>
>
> Cheers
> --
> *Jem Rayfield*
> Head of Solution Architecture
> Technology
>
> +44 (0)7709 332482
> Number One Southwark Bridge, London SE1 9HL
>
>
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>



-- 
*Jem Rayfield*
Head of Solution Architecture
Technology

+44 (0)7709 332482
Number One Southwark Bridge, London SE1 9HL


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