<?php
namespace Nominatim;
class ReverseGeocode
{
protected $oDB;
protected $iMaxRank = 28;
public function __construct(&$oDB)
{
$this->oDB =& $oDB;
}
public function setZoom($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;
}
/**
* Find the closest interpolation with the given search diameter.
*
* @param string $sPointSQL Reverse geocoding point as SQL
* @param float $fSearchDiam Search diameter
*
* @return Record of the interpolation or null.
*/
protected function lookupInterpolation($sPointSQL, $fSearchDiam)
{
$sSQL = 'SELECT place_id, parent_place_id, 30 as rank_search,';
$sSQL .= ' ST_LineLocatePoint(linegeo,'.$sPointSQL.') as fraction';
$sSQL .= ' , ST_Distance(linegeo,'.$sPointSQL.') as distance';
$sSQL .= ' FROM location_property_osmline';
$sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';
$sSQL .= ' and indexed_status = 0 and startnumber is not NULL ';
$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
return chksql(
$this->oDB->getRow($sSQL),
"Could not determine closest housenumber on an osm interpolation line."
);
}
/* lookup()
* returns { place_id =>, type => '(osm|tiger)' }
* fails if no place was found
*/
public function lookup($fLat, $fLon, $bDoInterpolation = true)
{
$sPointSQL = 'ST_SetSRID(ST_Point('.$fLon.','.$fLat.'),4326)';
$iMaxRank = $this->iMaxRank;
// Find the nearest point
$fSearchDiam = 0.0004;
$iPlaceID = null;
$fMaxAreaDistance = 1;
$bIsInUnitedStates = false;
$bPlaceIsTiger = false;
$bPlaceIsLine = false;
while (!$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 && $iMaxRank > 26) {
// try with interpolations before continuing
if ($bDoInterpolation) {
// no house found, try with interpolations
$aPlaceLine = $this->lookupInterpolation($sPointSQL, $fSearchDiam/2);
if ($aPlaceLine) {
// interpolation is closer to point than placex house
$bPlaceIsLine = true;
$aPlace = $aPlaceLine;
$iPlaceID = $aPlaceLine['place_id'];
$iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
$fFraction = $aPlaceLine['fraction'];
$iMaxRank = 30;
break;
}
}
// no interpolation found, continue search
$iMaxRank = 26;
}
$sSQL = 'select place_id,parent_place_id,rank_search,country_code';
$sSQL .= ' 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\',\'man_made\')';
$sSQL .= ' and indexed_status = 0 ';
$sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
$sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
if (CONST_Debug) var_dump($sSQL);
$aPlace = chksql(
$this->oDB->getRow($sSQL),
"Could not determine closest place."
);
$iPlaceID = $aPlace['place_id'];
$iParentPlaceID = $aPlace['parent_place_id'];
$bIsInUnitedStates = ($aPlace['country_code'] == 'us');
}
// If a house was found make sure there isn't an interpolation line
// that is closer
if ($bDoInterpolation && !$bPlaceIsLine && $aPlace && $aPlace['rank_search'] == 30) {
// get the distance of the house to the search point
$sSQL = 'SELECT ST_distance('.$sPointSQL.', house.geometry)';
$sSQL .= ' FROM placex as house WHERE house.place_id='.$iPlaceID;
$fDistancePlacex = chksql(
$this->oDB->getOne($sSQL),
"Could not determine distance between searched point and placex house."
);
// look for an interpolation that is closer
$aPlaceLine = $this->lookupInterpolation($sPointSQL, $fDistancePlacex);
if ($aPlaceLine && (float) $aPlaceLine['distance'] < (float) $fDistancePlacex) {
// interpolation is closer to point than placex house
$bPlaceIsLine = true;
$aPlace = $aPlaceLine;
$iPlaceID = $aPlaceLine['place_id'];
$iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
$fFraction = $aPlaceLine['fraction'];
}
}
// Only street found? If it's in the US we can check TIGER data for nearest housenumber
if (CONST_Use_US_Tiger_Data && $bDoInterpolation && $bIsInUnitedStates && $this->iMaxRank >= 28 && $iPlaceID && ($aPlace['rank_search'] == 26 || $aPlace['rank_search'] == 27 )) {
$fSearchDiam = 0.001;
$sSQL = 'SELECT place_id,parent_place_id,30 as rank_search, ST_LineLocatePoint(linegeo,'.$sPointSQL.') as fraction';
//if (CONST_Debug) { $sSQL .= ', housenumber, ST_distance('.$sPointSQL.', centroid) as distance, st_y(centroid) as lat, st_x(centroid) as lon'; }
$sSQL .= ' FROM location_property_tiger WHERE parent_place_id = '.$iPlaceID;
$sSQL .= ' AND ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')'; //no centroid anymore in Tiger data, now we have lines
$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
if (CONST_Debug) {
$sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
var_dump($sSQL);
$aAllHouses = chksql($this->oDB->getAll($sSQL));
foreach ($aAllHouses as $i) {
echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
}
}
$aPlaceTiger = chksql(
$this->oDB->getRow($sSQL),
"Could not determine closest Tiger place."
);
if ($aPlaceTiger) {
if (CONST_Debug) var_dump('found Tiger housenumber', $aPlaceTiger);
$bPlaceIsTiger = true;
$aPlace = $aPlaceTiger;
$iPlaceID = $aPlaceTiger['place_id'];
$iParentPlaceID = $aPlaceTiger['parent_place_id']; // the street
$fFraction = $aPlaceTiger['fraction'];
$iMaxRank = 30;
}
}
// The point we found might be too small - use the address to find what it is a child of
if ($iPlaceID && $iMaxRank < 28) {
if (($aPlace['rank_search'] > 28 || $bPlaceIsTiger || $bPlaceIsLine) && $iParentPlaceID) {
$iPlaceID = $iParentPlaceID;
$bPlaceIsLine = false;
$bPlaceIsTiger = false;
}
$sSQL = 'select address_place_id';
$sSQL .= ' FROM place_addressline';
$sSQL .= " WHERE place_id = $iPlaceID";
$sSQL .= " ORDER BY abs(cached_rank_address - $iMaxRank) asc,cached_rank_address desc,isaddress desc,distance desc";
$sSQL .= ' LIMIT 1';
$iPlaceID = chksql($this->oDB->getOne($sSQL), "Could not get parent for place.");
if (!$iPlaceID) {
$iPlaceID = $aPlace['place_id'];
}
}
return array(
'place_id' => $iPlaceID,
'type' => $bPlaceIsTiger ? 'tiger' : ($bPlaceIsLine ? 'interpolation' : 'osm'),
'fraction' => ($bPlaceIsTiger || $bPlaceIsLine) ? $fFraction : -1
);
}
}