[SOLR-2125] Spatial filter is not accurate

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5
• Fix Version/s: 3.1, 4.0-ALPHA
• Component/s: Build
• Assignee: Grant Ingersoll
• Reporter: Bill Bell
• Created: 20/Sep/10 23:48
• Updated: 30/Mar/11 15:45
• Resolved: 23/Sep/10 12:51

Description

The calculations of distance appears to be off.

Note: "The radius of the sphere to be used when calculating distances on a sphere (i.e. haversine). Default is the Earth's mean radius in kilometers (see org.apache.solr.search.function.distance.Constants.EARTH_MEAN_RADIUS_KM) which is set to 3,958.761458084784856. Most applications will not need to set this."

The radius of the earth in KM is 6371.009 km (≈3958.761 mi).

Also filtering distance appears to be off - example data:

45.17614,-93.87341 to 44.9369054,-91.3929348 Approx 137 miles Google. 169 miles = 220 kilometers

http://....../solr/select?fl=*,score&start=0&rows=10&q=

{!sfilt%20fl=store_lat_lon}

&qt=standard&pt=44.9369054,-91.3929348&d=280&sort=dist(2,store,vector(44.9369054,-91.3929348)) asc

Nothing shows. d=285 shows results. This is off by a lot.

Bill

Issue Links

• blocks: SOLR-1568 Implement Spatial Filter