refector reverse geocoding into its own class

2026-02-16 15:47:58 +00:00 · 2013-07-10 15:14:17 +01:00
parent 973995268d
commit b30fd57733
2 changed files with 215 additions and 0 deletions
--- a/lib/ReverseGeocode.php
+++ b/lib/ReverseGeocode.php
@@ -0,0 +1,139 @@
+<?php
+	class ReverseGeocode
+	{
+		protected $oDB;
+
+		protected $fLat;
+		protected $fLon;
+		protected $iMaxRank = 28;
+
+		protected $aLangPrefOrder = array();
+
+		protected $bShowAddressDetails = true;
+
+		function ReverseGeocode(&$oDB)
+		{
+			$this->oDB =& $oDB;
+		}
+
+		function setLanguagePreference($aLangPref)
+		{
+			$this->aLangPrefOrder = $aLangPref;
+		}
+
+		function setIncludeAddressDetails($bAddressDetails = true)
+		{
+			$this->bAddressDetails = $bAddressDetails;
+		}
+
+		function setLatLon($fLat, $fLon)
+		{
+			$this->fLat = (float)$fLat;
+			$this->fLon = (float)$fLon;
+		}
+
+		function setRank($iRank)
+		{
+			$this->iMaxRank = $iRank;
+		}
+
+		function setZoom($iZoom)
+		{
+			// 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
+				);
+			$this->iMaxRank = (isset($iZoom) && isset($aZoomRank[$iZoom]))?$aZoomRank[$iZoom]:28;
+		}
+
+		function lookup()
+		{
+			$sPointSQL = 'ST_SetSRID(ST_Point('.$this->fLon.','.$this->fLat.'),4326)';
+			$iMaxRank = $this->iMaxRank;
+
+			// Find the nearest point
+			$fSearchDiam = 0.0004;
+			$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,rank_search 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\',\'railway\',\'tunnel\',\'bridge\')';
+				$sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
+				$sSQL .= ' and indexed_status = 0 ';
+				$sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
+				$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
+				if (CONST_Debug) var_dump($sSQL);
+				$aPlace = $this->oDB->getRow($sSQL);
+				if (PEAR::IsError($aPlace))
+				{
+					failInternalError("Could not determine closest place.", $sSQL, $aPlace);
+				}
+				$iPlaceID = $aPlace['place_id'];
+				$iParentPlaceID = $aPlace['parent_place_id'];
+			}
+
+			// The point we found might be too small - use the address to find what it is a child of
+			if ($iPlaceID && $iMaxRank < 28)
+			{
+				if ($aPlace['rank_search'] > 28 && $iParentPlaceID)
+				{
+					$iPlaceID = $iParentPlaceID;
+				}
+				$sSQL = "select address_place_id from place_addressline where place_id = $iPlaceID order by abs(cached_rank_address - $iMaxRank) asc,cached_rank_address desc,isaddress desc,distance desc limit 1";
+				$iPlaceID = $this->oDB->getOne($sSQL);
+				if (PEAR::IsError($iPlaceID))
+				{
+					failInternalError("Could not get parent for place.", $sSQL, $iPlaceID);
+				}
+				if (!$iPlaceID)
+				{
+					$iPlaceID = $aPlace['place_id'];
+				}
+			}
+
+			$oPlaceLookup = new PlaceLookup($this->oDB);
+			$oPlaceLookup->setLanguagePreference($this->aLangPrefOrder);
+			$oPlaceLookup->setIncludeAddressDetails($this->bAddressDetails);
+			$oPlaceLookup->setPlaceId($iPlaceID);
+
+			return $oPlaceLookup->lookup();
+		}
+	}
+?>