+
+ 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 $iPlaceID;
+ }
+
+ function loadStructuredAddressElement(&$aStructuredQuery, &$iMinAddressRank, &$iMaxAddressRank, $aParams, $sKey, $iNewMinAddressRank, $iNewMaxAddressRank)
+ {
+ if (!isset($_GET[$sKey])) return false;
+ $sValue = trim($_GET[$sKey]);
+ if (!$sValue) return false;
+ $aStructuredQuery[$sKey] = $sValue;
+ if ($iMinAddressRank == 0 && $iMaxAddressRank == 30) {
+ $iMinAddressRank = $iNewMinAddressRank;
+ $iMaxAddressRank = $iNewMaxAddressRank;
+ }
+ return true;
+ }