= Spatial Filter in LUcene  =

|| '''Date''' || 2008/11/04 ||
|| '''Contact(s)''' || fxprunayre, jesse ||
|| '''Last edited''' || [[Timestamp]] ||
|| '''Status''' || draft ||
|| '''Assigned to release''' || to be determined ||
|| '''Resources''' || Resource available ||

== Overview ==

Actually GeoNetwork only handle bbox search using Lucene

In a metadata record you could define an extent using

    * a description
    * a bbox in latlong
    * or a gml object 

In the search interface, we could search using a geographic keyword (matched to description in the metadata) or bbox matched to bbox in metadata

Requirements:
    * handle geographic search between user search criteria (which could be description (eg. canton, commune), bbox, geomtries and metadata records extent information 



=== Proposal Type ===
 * '''Type''': Index
 * '''App''': !GeoNetwork
 * '''Module''': Lucene Index : LuceneSearcher (main, xml, rss, pdf search) and CatalogueSearcher (CSW search)

=== Links ===
 * '''Documents''':
 * '''Email discussions''':
 * '''Other wiki discussions''':

=== Voting History ===
 * Vote proposed by X on Y, result was +/-n (m non-voting members).

----

== Motivations ==
Improve spatial search support in GeoNetwork.

== Proposal == 
On indexing procedure, populate a spatial index based on Shapefile (stored  in WEB-INF/lucene/spatial). Store the shapefile index in memory to run the spatial filter after the search.

The following operations are supported :
 * ENCLOSES
 * CROSSES,
 * OUTSIDEOF,
 * EQUAL,
 * INTERSECTION,
 * OVERLAPS,
 * TOUCHES,
 * WITHIN,

Query Examples :
 * http://localhost:8080/geonetwork/srv/en/xml.search?geometry=POLYGON((10%2010,10%2020,20%2020,20%2015,10%2010))&relation=intersection
 * http://localhost:8080/geonetwork/srv/en/xml.search?geometry=POLYGON((10%2010,10%2020,20%2020,20%2015,10%2010))&relation=equal
 * http://localhost:8080/geonetwork/srv/en/xml.search?geometry=POLYGON((7%2046,7%2047,8%2047,7%2046,7%2046))&relation=equal
 * http://localhost:8080/geonetwork/srv/en/xml.search?geometry=POINT(7%2046)


=== Backwards Compatibility Issues ===

== Risks ==

== Participants ==
 * fxprunayre, jesse