Hi all All my talks about indexing were based on (my) assumption, that efficient querying (what is the core case I am looking forward) requires existence of an index. Frankly speaking - I am mostly interested in querying - if it goes fast enough without any index, I do not mind the difference.
My geo - interest is rather general one - we sometime produce and analyse GeoRSS files, sometime KML files - so far without any direct use of the spacial information by BaseX XQuery. Thinks I would think of are:
- selecting elements in some region, inside of a buffer etc. - calculating distance of a point to some line segment - converting coordinates between different systems (like S-JTSK and WGS84 - converting linear geometries between GeoRSS and KML
Checking http://expath.org/spec/geo shows, there are many features, which would be great for most of my wishes (if not all) With best regards
Jan
*Ing. Jan Vlčinský* CAD programy Slunečnicová 338/3, 734 01 Karviná Ráj, Czech Republic tel: +420-597 602 024; mob: +420-608 979 040 skype: janvlcinsky; GoogleTalk: jan.vlcinsky@gmail.com http://cz.linkedin.com/in/vlcinsky
On 6 January 2012 16:55, Rositsa Shadura rositsa.shadura@uni-konstanz.dewrote:
Hi Ingo, hi all,
until now we at BaseX have not discussed the implementation of a geospatial API. However, I would like to ask you what is actually your requirement: a module which provides functions for querying spatial data or a feature for indexing such data or both? :) I ask because the replies from Jan and Erdal referred to indexes, while this from Eric was more about a module for querying such data. Currently there is a specification provided by EXPath[1] which defines an extensive geospatial API. The only implementation of this specification is, as far as I know, this provided by Zorba[2]. The ones offerred by eXist[3] and MarkLogic[4] do not follow it or provide just a subset of the functions in it. Do you think that an implementation of the EXPath geospatial API would be useful for you?
Regards, Rositsa
[1] http://expath.org/spec/geo [2] http://zorba-xquery.com/site2/**doc/latest/zorba/xqdoc/xhtml/** expath.org_ns_geo.htmlhttp://zorba-xquery.com/site2/doc/latest/zorba/xqdoc/xhtml/expath.org_ns_geo.html [3] http://demo.exist-db.org/**exist/functions/spatialhttp://demo.exist-db.org/exist/functions/spatial [4] http://developer.marklogic.**com/pubs/4.0/apidocs/GEO.htmlhttp://developer.marklogic.com/pubs/4.0/apidocs/GEO.html
On Mon, 02 Jan 2012 18:07:17 +0100, Schildmann, Ingo Schildmann@karb.de wrote:
Hi,
Our company evaluates BaseX for our project.
A new requirement is to show spatial data with a geographic information system.
Are there any plans for a spatial xquery module for querying GML like the (experimental) module in eXist?
http://exist-db.org/**extensions.html#module_spatialhttp://exist-db.org/extensions.html#module_spatial
Regards, Ingo
Dr. Karb Informationstechnologien Im Wolfer 10 70599 Stuttgart Tel.: 0711 - 4 51 24 - 70 Fax: 0711 - 4 51 24 - 55 Web: http://www.karb.de http://www.karb.de/ Mail: schildmann@karb.de mailto:schildmann@karb.de Skype: ischildmann
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