The main reference for this approach is here: http://wiki.apache.org/solr/SpatialForTimeDurations
Hoss’s illustrations he developed for the meetup presentation are great. However, there are bugs in the instruction — specifically it’s important to slightly buffer the query and choose an appropriate maxDistErr. Also, it’s more preferable to use the rectangle range query style of spatial query (e.g. field:[“minX minY” TO “maxX maxY”] as opposed to using “Intersects(minX minY maxX maxY)”. There’s no technical difference but the latter is deprecated and will eventually be removed from Solr 5 / trunk. All this said, recognize this is a bit of a hack (one that works well). There is a good chance a more ideal implementation approach is going to be developed this year. ~ David On 3/1/14, 2:54 PM, "Shawn Heisey" <s...@elyograg.org> wrote: >On 3/1/2014 11:41 AM, Thomas Scheffler wrote: >> Am 01.03.14 18:24, schrieb Erick Erickson: >>> I'm not clear what you're really after here. >>> >>> Solr certainly supports ranges, things like time:[* TO date_spec] or >>> date_field:[date_spec TO date_spec] etc. >>> >>> >>> There's also a really creative use of spatial (of all things) to, say >>> answer questions involving multiple dates per record. Imagine, for >>> instance, employees with different hours on different days. You can >>> use spatial to answer questions like "which employees are available >>> on Wednesday between 4PM and 8PM". >>> >>> And if none of this is relevant, how about you give us some >>> use-cases? This could well be an XY problem. >> >> Hi, >> >> lets try this example to show the problem. You have some old text that >> was written in two periods of time: >> >> 1.) 2nd half of 13th century: -> 1250-1299 >> 2.) Beginning of 18th century: -> 1700-1715 >> >> You are searching for text that were written between 1300-1699, than >> this document described above should not be hit. >> >> If you make start date and end date multiple this results in: >> >> start: [1250, 1700] >> end: [1299, 1715] >> >> A search for documents written between 1300-1699 would be: >> >> (+start:[1300 TO 1699] +end:[1300-1699]) (+start:[* TO 1300] +end:[1300 >> TO *]) (+start:[*-1699] +end:[1700 TO *]) >> >> You see that the document above would obviously hit by "(+start:[* TO >> 1300] +end:[1300 TO *])" > >This sounds exactly like the spatial use case that Erick just described. > >http://wiki.apache.org/solr/SpatialForTimeDurations >https://people.apache.org/~hossman/spatial-for-non-spatial-meetup-20130117 >/ > >I am not sure whether the following presentation covers time series with >spatial, but it does say deep dive. It's over an hour long, and done by >David Smiley, who wrote most of the Spatial code in Solr: > >http://www.lucenerevolution.org/2013/Lucene-Solr4-Spatial-Deep-Dive > >Hopefully someone who has actually used this can hop in and give you >some additional pointers. > >Thanks, >Shawn >
