> Your goal is to restrict documents search results to spatial extends > similar to the syntax which restricts documents based on their > (creation/modification) date within a given time period.
Yes... That's the immediate goal, which I have already achieved by using quadTrees and the GeoFilter class I pasted here. This is already live (since yesterday). To see it in action, go to: http://www.localharvest.org. It's a little bit of a hack though, and needs some work before I can contribute it in any meaningful form to the project. > For the indexing field descriptions are added to the indexer in order > to tell him, which fields to index and which store. You now want to > add a new type, let's call it coordinates (WGS84) as a new field type > to index. For Lucene API users nothing changes from here on for the > index. I haven't studied the structure of the Lucene index yet. (which I'll do) so I don't really know how to approach this. It makes sense to add a new "Coordinates" Field type to documents, but I suspect that the spatial indexing (using a quadTree in my implementation) needs to be done outside of Lucene's regular indexing. > Now, in a search, a bounding box is given as two WGS84 coordinates (= > lat/lon numbers north/west and lat/lon numbers south east) being a > syntax extension. That's right. Additional search formats would ba a central point plus a radius, or just a central point, returning all documents ranked by proximity to the point. Maybe this last one should be done as a Sort instead? > Based on the location value (if any) of each hit a result set comes > out which is a subset of all hits if there was no spatial filter > (don't now how you handle hits which have no lat/lon location value?). In my project, all items have locations. For a more generic implementation, yes, that has to be thought through. As I said, the problem has pretty much been solved now. I'm just using the GeoFilter I wrote (and posted here). I would like to reimplement it in some "clean way" so that it can be rolled into the project. --G -- Guillermo Payet L O C A L H A R V E S T http://www.localharvest.org Every Morning I awake torn between a desire to save the world and an inclination to savor it. This makes it hard to plan the day. -E.B.White --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
