Map extension

[Olivier Dalang]

Dear list,

After having successfully installed Ontowiki, I wanted to give the Map extension a try (my data has a lot of geographic attributes).

I downloaded it, and put it in the extensions folder. It now appears on the "Configure extension" page as activated, but I don't see any icon/tool/tabluator(don't know what it is?) related to it. I tried to toggle it on/off, but nothing more.

I tried with the map extension 1.2 and master, but both didn't work. Both fail silently with no error.

I found this [1], but the page states it's outdated, which seems seems true.

And this thread [2], which is also a bit old, but the OP seemed to have the same problem, and it seems it was solved at that time.

Am I doing something wrong ?

Is the extension broken ? If so, is there some hope to see it fixed soon ?

On [1], there a link to a screencast, which unfortunately is broken, is this screencast still available somewhere ?

Thanks a lot !

Olivieri

[1] : http://wiki.aksw.org/Projects/OntoWiki/MapPlugin

[2] : https://groups.google.com/forum/#!msg/ontowiki-user/Dy-qkVrlF8A/vAVocQ-uF9YJ

[Olivier Dalang]

No one about this ?

[Sebastian Tramp]

On Tue, Jun 10, 2014 at 11:37:13AM +0200, Olivier Dalang wrote:

> No one about this ?

sorry for the long run of this thread.

Typically, Nate answers map related questions but he is in holiday now I think.

Best regards

Sebastian Tramp

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WebID: http://aksw.org/SebastianTramp

[Olivier Dalang]

Ok, thanks for the info ! I'll wait a bit then ;)

Best,

Olivier

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WebID: http://aksw.org/SebastianTramp

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[Natanael Arndt]

Hello Oliver,
thank you for your patients …

The current mast branch should be the best choice [1] as you found it already. I think we don't have up to date documentation for the map extension, but it should work out of the box.

You can see that its working, if you have any resource which uses the following two predicates:

http://www.w3.org/2003/01/geo/wgs84_pos#lat
http://www.w3.org/2003/01/geo/wgs84_pos#long

I you view a list containing this resource, the map extension should show up as a module on the right hand side and if you click on the resource, you should also see it as module in the properties view. Additionally you should have a tab “Map” in both or one of the two views (I can't recall with 100% certainty at the moment.)

If you use different predicates than the aforementioned you have to add the following lines to <ontowiki base>/extensions/map.ini under [private]

property.latitude[] = http://yourPredicateUri#lat
property.longitude[] = http://yourPredicateUri#long

[1] https://github.com/AKSW/map.ontowiki/tree/master

Best of luck
Natanael

[Olivier Dalang]

Hi,

Thank you very much for your answer ! I'll try it as soon as possible.

I also learned in the meantime that Virtuoso's spatial support is very partial : it seem it only handles points [1]. Do you have by any chance any insights on Virtuoso's roadmap about this ?

I read on [2] that support for other types is planned, and asked them about is, but have got no answer so far.

I don't really understand how the mysql driver works with sparql queries, but would there be a way to take advantage of mysql's spatial functions (and more importantly the R-tree spatial index) in sparql queries ?

Adapting Ontowiki to work with other databases like Jena or Strabon (which both seem to have good spatial support) will unfortunately go far beyond my skills...

Bests,

Olivier Dalang

[1] : http://docs.openlinksw.com/virtuoso/sqlrefgeospatial.html

[2] : http://www.openlinksw.com/dataspace/doc/oerling/weblog/Orri%20Erling's%20Blog/1587

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[Natanael Arndt]

Hi Oliver,
the OntoWiki geo function are independent to the geo functions of virtuoso. So it should work without problems.

In general OntoWiki is independent of the store behind, as long as you develop an adapter for it [1].

[1] https://github.com/AKSW/Erfurt/tree/develop/library/Erfurt/Store/Adapter

All the best
Natanael