Hi,
our strategy is to have a separate center coordinate field that we use
for sorting. This has the additional benefit that it's possible to have
the indexed center point differ from the polygon's centroid, which can
be useful e.g. with cities, where the city center can be quite a bit
offset from the centroid.
--Ere
Grondin Luc kirjoitti 13.9.2017 klo 0.07:
Hello,
I am having difficulties with sorting by distance resources indexed with WKT
geolocation data. I have tried different field configurations and query
parameters and I did not get working results.
I am using SOLR 6.6 and JTS-core 1.14. My test sample includes resources with point coordinates
plus one associated with a polygon. I tried using both fieldtypes
"solr.SpatialRecursivePrefixTreeFieldType" and
"solr.RptWithGeometrySpatialField". In both cases, I get good results if I do not care
about sorting. The problem arises when I include sorting.
With SpatialRecursivePrefixTreeFieldType:
The best request I used, based on the documentation I could find, was:
select?fl=*,score&q={!geofilt%20sfield=PositionGeo%20pt=45.52,-73.53%20d=10%20score=distance}&sort=score%20asc
The distance appears to be correctly evaluated for resources indexed with point
coordinates. However, it is wrong for the resource with a polygon
<result name="response" numFound="5" start="0" maxScore="20015.115">
<doc><float name="score">2.3913236</float></doc>
<doc><float name="score">4.3242383</float></doc>
<doc><float name="score">4.671504</float></doc>
<doc><float name="score">4.806902</float></doc>
<doc><float name="score">20015.115</float></doc>
</result>
(Please note that I have verified the polygon externally and it is correct)
With solr.RptWithGeometrySpatialField:
I get an exception triggered by the presence of « score=distance » in the
request «
q={!geofilt%20sfield=PositionGeo%20pt=45.52,-73.53%20d=10%20score=distance} »
java.lang.UnsupportedOperationException
at
org.apache.lucene.spatial.composite.CompositeSpatialStrategy.makeDistanceValueSource(CompositeSpatialStrategy.java:92)
at
org.apache.solr.schema.AbstractSpatialFieldType.getValueSourceFromSpatialArgs(AbstractSpatialFieldType.java:412)
at
org.apache.solr.schema.AbstractSpatialFieldType.getQueryFromSpatialArgs(AbstractSpatialFieldType.java:359)
at
org.apache.solr.schema.AbstractSpatialFieldType.createSpatialQuery(AbstractSpatialFieldType.java:308)
at
org.apache.solr.search.SpatialFilterQParser.parse(SpatialFilterQParser.java:80)
From there, I am rather stuck with no ideas on how to resolve these problems.
So advises in that regards would be much appreciated. I can provide more
details if necessary.
Thank you in advance,
---
Luc Grondin
Analyste en gestion de l'information numérique
Centre d'expertise numérique pour la recherche - Université de Montréal
téléphone: 514-343-6111 p. 3988 --
luc.gron...@umontreal.ca<mailto:luc.gron...@umontreal.ca>
--
Ere Maijala
Kansalliskirjasto / The National Library of Finland
