Hi everyone,
I've been playing around with the new spatial search functionalities
included in the newer versions of solr (solr 4.1 and solr trunk 5.0), and
i've found something strange when I try to find a point inside a polygon
(particularly inside a square).
You can reproduce this problem using the spatial-solr-sandbox project that
has the following config for the fields:
/[...]
<fieldType name="geohash" class="solr.SpatialRecursivePrefixTreeFieldType"
units="degrees" />
[...]
<field name="geohash" type="geohash" indexed="true" stored="true"
multiValued="false" />
[...]/
I'm trying to find the following document:
/<doc>
<str name="id">G292223</str>
<str name="name">Dubai</str>
<str name="geohash">55.280000 25.252220</str>
</doc>
/
I want to test if this point is located inside a polygon so i'm using the
following query:
/q=geohash:"Intersects(POLYGON((55.180000 25.352220,55.380000
25.352220,55.380000 25.152220,55.180000 25.152220,55.180000 25.352220)))"/
As you can see, it's a small square that contains the point described
before. I get some results, but that document is not there, and the ones
returned are wrong since they are not even inside the square.
/<result name="response" numFound="8" start="0">
<doc>
<str name="id">G1809498</str>
<str name="name">Guilin</str>
<str name="geohash">110.286390 25.281940</str>
</doc>
[...]/
However, if i change a little bit the shape of the square (just changed a
little bit one corner), it returns the result as expected
/q=geohash:"Intersects(POLYGON((55.180000 25.352220,*55.480000*
25.352220,55.380000 25.152220,55.180000 25.152220,55.180000 25.352220)))"/
Now it returns a single result and it's OK
/<result name="response" numFound="1" start="0">
<doc>
<str name="id">G292223</str>
<str name="name">Dubai</str>
<str name="geohash">55.280000 25.252220</str>
</doc>
</result>/
If i use a bbox with the same size and position than the first square, it
returns correctly the document.
/q=geohash:"Intersects(55.180000 25.152220 55.380000 25.352220)"
<result name="response" numFound="1" start="0">
<doc>
<str name="id">G292223</str>
<str name="name">Dubai</str>
<str name="geohash">55.280000 25.252220</str>
</doc>
</result>/
If you draw another polygon such a triangle it works well too.
I've tested this against different points and it's always the same, it seems
that if you draw a straight square (or rectangle),
it can't find the point inside it, and it returns wrong results.
Am i doing anything wrong?
Thanks in advance
Jorge
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