hans/Nominatim
1
0
Fork 1
mirror of https://github.com/osm-search/Nominatim.git synced 2026-02-15 19:07:58 +00:00
Code Issues Packages Projects Releases Wiki Activity

speed up reverse lookup of place nodes

Browse Source 
Add a special index that contains the place nodes buffered by their
respective area according to their search rank. This replaces the
maximum area search for place nodes and reduces drastically the number
of place nodes that need to be retrieved.
This commit is contained in:
Sarah Hoffmann
2023-02-17 10:31:49 +01:00
parent 3405dbf90e
commit 8ed096f938
5 changed files with 29 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
lib-php/ReverseGeocode.php
View File

@@ -216,23 +216,18 @@ class ReverseGeocode
$sSQL .= ' ST_distance('.$sPointSQL.', geometry) as distance';
$sSQL .= ' FROM placex';
$sSQL .= ' WHERE osm_type = \'N\'';
// using rank_search because of a better differentiation
// for place nodes at rank_address 16
$sSQL .= ' AND rank_search > '.$iRankSearch;
$sSQL .= ' AND rank_search <= '.$iMaxRank;
$sSQL .= ' AND rank_search < 26 '; // needed to select right index
$sSQL .= ' AND rank_address > 0';
$sSQL .= ' AND class = \'place\'';
$sSQL .= ' AND rank_address between 4 and 25'; // needed to select right index
$sSQL .= ' AND type != \'postcode\'';
$sSQL .= ' AND name IS NOT NULL ';
$sSQL .= ' AND indexed_status = 0 AND linked_place_id is null';
$sSQL .= ' AND ST_DWithin('.$sPointSQL.', geometry, reverse_place_diameter('.$iRankSearch.'::smallint))';
$sSQL .= ' ORDER BY distance ASC,';
$sSQL .= ' rank_address DESC';
$sSQL .= ' limit 500) as a';
$sSQL .= ' WHERE ST_CONTAINS((SELECT geometry FROM placex WHERE place_id = '.$iPlaceID.'), geometry )';
$sSQL .= ' AND ST_Buffer(geometry, reverse_place_diameter(rank_search)) && '.$sPointSQL;
$sSQL .= ' ORDER BY rank_search DESC, distance ASC';
$sSQL .= ' limit 100) as a';
$sSQL .= ' WHERE ST_Contains((SELECT geometry FROM placex WHERE place_id = '.$iPlaceID.'), geometry )';
$sSQL .= ' AND distance <= reverse_place_diameter(rank_search)';
$sSQL .= ' ORDER BY distance ASC, rank_search DESC';
$sSQL .= ' ORDER BY rank_search DESC, distance ASC';
$sSQL .= ' LIMIT 1';
Debug::printSQL($sSQL);