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From "Bill Bell (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (SOLR-2125) Spatial filter is not accurate
Date Wed, 22 Sep 2010 01:03:33 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913126#action_12913126
] 

Bill Bell edited comment on SOLR-2125 at 9/21/10 9:02 PM:
----------------------------------------------------------

Grant: Can you give a good example using the same measurements for sorting and sfilt ?

Will this work? The Spatial Wiki http://wiki.apache.org/solr/SpatialSearch shows:

3.Using the "frange" QParser, as in fq={!frange l=0 u=400}hsin(0.57, -1.3, lat_rad, lon_rad,
3963.205) 

The Function Wiki Shows:

hsin(radius, true|false, x1,y1,x2,y2)

Here is the correct solution: (UPDATED)

http://localhost:8983/solr/select/??fl=*,score&start=0&rows=10&q={!sfilt%20fl=store}&qt=standard&pt=44.9369054,-91.3929348&d=285&sort=hsin%286371,true,store,vector%2844.9369054,-91.3929348%29%29%20asc

The Local Solr from Patrick projected the ur, ll using the distance and did a range check
to see if the points are in the box.It is a close approximation. 


      was (Author: billnbell):
    Grant: Can you give a good example using the same measurements for sorting and sfilt ?

Will this work? The Spatial Wiki http://wiki.apache.org/solr/SpatialSearch shows:

3.Using the "frange" QParser, as in fq={!frange l=0 u=400}hsin(0.57, -1.3, lat_rad, lon_rad,
3963.205) 

The Function Wiki Shows:

hsin(radius, true|false, x1,y1,x2,y2)

Would the correct solution be the following - can I use a vector?

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=hsin(6371,true,store,vector(44.9369054,-91.3929348))
asc 

The Local Solr from Patrick projected the ur, ll using the distance and did a range check
to see if the points are in the box.It is a close approximation. An ellipses would be closer.
Circle is not close enough.

  
> Spatial filter is not accurate
> ------------------------------
>
>                 Key: SOLR-2125
>                 URL: https://issues.apache.org/jira/browse/SOLR-2125
>             Project: Solr
>          Issue Type: Bug
>          Components: Build
>    Affects Versions: 1.5
>            Reporter: Bill Bell
>            Assignee: Grant Ingersoll
>         Attachments: solrspatial.xlsx
>
>
> 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

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