[postgis-users] Find closest Table Points to input Search Points
Paul & Caroline Lewis
paulcaz80 at hotmail.com
Sun Apr 2 12:47:15 PDT 2017
Basic problem is that I have a large table of GPS points and another input data set of GPS points.
For each input GPS point I want to find the closest 1 to it in the GPS table.
The GPS table can, handily, be constrained by 2 other relational tables that link to the GPS data
I've got the below query to work for me when searching the GPS table for 1 input point.
So I can put this into a scripted processing loop to get every input point by making many SQL queries.
However, I'm wondering if its possible to use an array of the input search points to do the complete search in 1 DB Query request.
SELECT R.hash_id, N.gps_time FROM nav AS N, recording AS R, relation_recording_group AS G WHERE G.group_id = 52 AND G.recording_id = R.recording_id AND N.recording_id = R.recording_id AND R.formats < 10 AND R.status != 3 ORDER BY N.wgs_geom <-> ST_GeomFromText('POINT(LONGITUDE LATITUDE)',4326) LIMIT 1;
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