My response to a direct email (copying here with permission): It's possible; you'll certainly have to write some code here to make this work, including some new Solr plugin; perhaps ValueSourceParser that can compute a more accurate overlap. Such a thing would have to get the Spatial4J Shape from the RptWithGeometrySpatialField (see getValues). Then some casting to unwrap it to get to a JTS Geometry. All this is going to be slow, so I propose you use Solr query re-ranking to only do this on the top results that are based on the bounding-box overlap ratio as an approximation.
https://lucene.apache.org/solr/guide/8_3/query-re-ranking.html ---------- Forwarded message --------- From: Marc Date: Tue, Jan 7, 2020 at 6:14 AM Subject: Solr spatial search - overlapRatio of polygons To: David Smiley <dsmi...@apache.org> Dear Mr Smiley, I have a tricky question concerning the spatial search features of Solr and therefore I am directly contacting you, as a specialist. Currently I am developing a new catalogue for our map collection with Solr. I would like to sort the search results by the overlap ratio of the search rectangle and the polygon of the map corners. Solr provides such a feature for comparing and sorting bounding boxes only. But it should be possible to compare polygons with the help of JTS functions (locationtech.github.io/jts/javadoc/org/locationtech/jts/geom/Geometry.html). With intersection() you can compute the geometry of the overlapping part. Afterwards you may calculate the size of it with getArea() and compare it with the size of the search rectangle. Is there a way to use such JTS functions in a Solr query? Or do you know another option to sort by the overlap ratio of polygons?
