X-Git-Url: https://git.openstreetmap.org/nominatim.git/blobdiff_plain/942ed125d4c7f93a741166cfeacf8d6115623e8d..c115a53df75584521060f7025a7caa703f00d4d4:/lib/lib.php

diff --git a/lib/lib.php b/lib/lib.php
index 7f56a1de..20b1f8ce 100644
--- 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;
+	}