over tokenising 'la'

[nominatim.git] / lib / lib.php

diff --git a/lib/lib.php b/lib/lib.php
index 7f56a1de68f5f339eec7064b3397cb9350c2f501..20b1f8ce260418ed8f48f9b00d4fc42dd6c2c5f5 100644 (file)
--- a/lib/lib.php
+++ b/lib/lib.php
@@ -816,3 +816,102 @@
                $aSimilar = $oDB->getAll($sSQL);
                return $aSimilar;
        }
+
+       function geocodeReverse($fLat, $fLon, $iZoom=18)
+       {
+               $oDB =& getDB();
+
+               $sPointSQL = "ST_SetSRID(ST_Point($fLon,$fLat),4326)";
+
+               // Zoom to rank, this could probably be calculated but a lookup gives fine control
+               $aZoomRank = array(
+                       0 => 2, // Continent / Sea
+                       1 => 2,
+                       2 => 2,
+                       3 => 4, // Country
+                       4 => 4,
+                       5 => 8, // State
+                       6 => 10, // Region
+                       7 => 10, 
+                       8 => 12, // County
+                       9 => 12,  
+                       10 => 17, // City
+                       11 => 17, 
+                       12 => 18, // Town / Village
+                       13 => 18, 
+                       14 => 22, // Suburb
+                       15 => 22,
+                       16 => 26, // Street, TODO: major street?
+                       17 => 26, 
+                       18 => 30, // or >, Building
+                       19 => 30, // or >, Building
+                       );
+               $iMaxRank = isset($aZoomRank[$iZoom])?$aZoomRank[$iZoom]:28;
+
+               // Find the nearest point
+               $fSearchDiam = 0.0001;
+               $iPlaceID = null;
+               $aArea = false;
+               $fMaxAreaDistance = 1;
+               while(!$iPlaceID && $fSearchDiam < $fMaxAreaDistance)
+               {
+                       $fSearchDiam = $fSearchDiam * 2;
+
+                       // If we have to expand the search area by a large amount then we need a larger feature
+                       // then there is a limit to how small the feature should be
+                       if ($fSearchDiam > 2 && $iMaxRank > 4) $iMaxRank = 4;
+                       if ($fSearchDiam > 1 && $iMaxRank > 9) $iMaxRank = 8;
+                       if ($fSearchDiam > 0.8 && $iMaxRank > 10) $iMaxRank = 10;
+                       if ($fSearchDiam > 0.6 && $iMaxRank > 12) $iMaxRank = 12;
+                       if ($fSearchDiam > 0.2 && $iMaxRank > 17) $iMaxRank = 17;
+                       if ($fSearchDiam > 0.1 && $iMaxRank > 18) $iMaxRank = 18;
+                       if ($fSearchDiam > 0.008 && $iMaxRank > 22) $iMaxRank = 22;
+                       if ($fSearchDiam > 0.001 && $iMaxRank > 26) $iMaxRank = 26;
+
+                       $sSQL = 'select place_id,parent_place_id from placex';
+                       $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', geometry, '.$fSearchDiam.')';
+                       $sSQL .= ' and rank_search != 28 and rank_search >= '.$iMaxRank;
+                       $sSQL .= ' and (name is not null or housenumber is not null)';
+                       $sSQL .= ' and class not in (\'waterway\')';
+                       $sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
+                       $sSQL .= ' OR ST_DWithin('.$sPointSQL.', ST_Centroid(geometry), '.$fSearchDiam.'))';
+                       $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
+//var_dump($sSQL);
+                       $aPlace = $oDB->getRow($sSQL);
+                       $iPlaceID = $aPlace['place_id'];
+                       if (PEAR::IsError($iPlaceID))
+                       {
+                               var_Dump($sSQL, $iPlaceID); 
+                               exit;
+                       }
+               }
+
+               // The point we found might be too small - use the address to find what it is a child of
+               if ($iPlaceID)
+               {
+                       $sSQL = "select address_place_id from place_addressline where cached_rank_address <= $iMaxRank and place_id = $iPlaceID order by cached_rank_address desc,isaddress desc,distance desc limit 1";
+                       $iPlaceID = $oDB->getOne($sSQL);
+                       if (PEAR::IsError($iPlaceID))
+                       {
+                               var_Dump($sSQL, $iPlaceID); 
+                               exit;
+                       }
+
+                       if ($iPlaceID && $aPlace['place_id'] && $iMaxRank < 28)
+                       {
+                               $sSQL = "select address_place_id from place_addressline where cached_rank_address <= $iMaxRank and place_id = ".$aPlace['place_id']." order by cached_rank_address desc,isaddress desc,distance desc";
+                               $iPlaceID = $oDB->getOne($sSQL);
+                               if (PEAR::IsError($iPlaceID))
+                               {
+                                       var_Dump($sSQL, $iPlaceID); 
+                                       exit;
+                               }
+                       }
+                       if (!$iPlaceID)
+                       {
+                               $iPlaceID = $aPlace['place_id'];
+                       }
+               }
+
+               return $iPlaceID;
+       }