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handle pure lat,lon search by passing to reverse geocoding and returning first match as a search result

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Brian Quinion
2011-05-03 17:34:51 +00:00
parent 63bc75b3dd
commit c988be1ddf
2 changed files with 171 additions and 2 deletions
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99
lib/lib.php
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@@ -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;
}