lib/ReverseGeocode.php

   1 <?php
   2         class ReverseGeocode
   3         {
   4                 protected $oDB;
   5
   6                 protected $fLat;
   7                 protected $fLon;
   8                 protected $iMaxRank = 28;
   9
  10                 protected $aLangPrefOrder = array();
  11
  12                 protected $bShowAddressDetails = true;
  13
  14                 function ReverseGeocode(&$oDB)
  15                 {
  16                         $this->oDB =& $oDB;
  17                 }
  18
  19                 function setLanguagePreference($aLangPref)
  20                 {
  21                         $this->aLangPrefOrder = $aLangPref;
  22                 }
  23
  24                 function setIncludeAddressDetails($bAddressDetails = true)
  25                 {
  26                         $this->bAddressDetails = $bAddressDetails;
  27                 }
  28
  29                 function setLatLon($fLat, $fLon)
  30                 {
  31                         $this->fLat = (float)$fLat;
  32                         $this->fLon = (float)$fLon;
  33                 }
  34
  35                 function setRank($iRank)
  36                 {
  37                         $this->iMaxRank = $iRank;
  38                 }
  39
  40                 function setZoom($iZoom)
  41                 {
  42                         // Zoom to rank, this could probably be calculated but a lookup gives fine control
  43                         $aZoomRank = array(
  44                                 0 => 2, // Continent / Sea
  45                                 1 => 2,
  46                                 2 => 2,
  47                                 3 => 4, // Country
  48                                 4 => 4,
  49                                 5 => 8, // State
  50                                 6 => 10, // Region
  51                                 7 => 10,
  52                                 8 => 12, // County
  53                                 9 => 12,
  54                                 10 => 17, // City
  55                                 11 => 17,
  56                                 12 => 18, // Town / Village
  57                                 13 => 18,
  58                                 14 => 22, // Suburb
  59                                 15 => 22,
  60                                 16 => 26, // Street, TODO: major street?
  61                                 17 => 26,
  62                                 18 => 30, // or >, Building
  63                                 19 => 30, // or >, Building
  64                                 );
  65                         $this->iMaxRank = (isset($iZoom) && isset($aZoomRank[$iZoom]))?$aZoomRank[$iZoom]:28;
  66                 }
  67
  68                 function lookup()
  69                 {
  70                         $sPointSQL = 'ST_SetSRID(ST_Point('.$this->fLon.','.$this->fLat.'),4326)';
  71                         $iMaxRank = $this->iMaxRank;
  72
  73                         // Find the nearest point
  74                         $fSearchDiam = 0.0004;
  75                         $iPlaceID = null;
  76                         $aArea = false;
  77                         $fMaxAreaDistance = 1;
  78                         while(!$iPlaceID && $fSearchDiam < $fMaxAreaDistance)
  79                         {
  80                                 $fSearchDiam = $fSearchDiam * 2;
  81
  82                                 // If we have to expand the search area by a large amount then we need a larger feature
  83                                 // then there is a limit to how small the feature should be
  84                                 if ($fSearchDiam > 2 && $iMaxRank > 4) $iMaxRank = 4;
  85                                 if ($fSearchDiam > 1 && $iMaxRank > 9) $iMaxRank = 8;
  86                                 if ($fSearchDiam > 0.8 && $iMaxRank > 10) $iMaxRank = 10;
  87                                 if ($fSearchDiam > 0.6 && $iMaxRank > 12) $iMaxRank = 12;
  88                                 if ($fSearchDiam > 0.2 && $iMaxRank > 17) $iMaxRank = 17;
  89                                 if ($fSearchDiam > 0.1 && $iMaxRank > 18) $iMaxRank = 18;
  90                                 if ($fSearchDiam > 0.008 && $iMaxRank > 22) $iMaxRank = 22;
  91                                 if ($fSearchDiam > 0.001 && $iMaxRank > 26) $iMaxRank = 26;
  92
  93                                 $sSQL = 'select place_id,parent_place_id,rank_search from placex';
  94                                 $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', geometry, '.$fSearchDiam.')';
  95                                 $sSQL .= ' and rank_search != 28 and rank_search >= '.$iMaxRank;
  96                                 $sSQL .= ' and (name is not null or housenumber is not null)';
  97                                 $sSQL .= ' and class not in (\'waterway\',\'railway\',\'tunnel\',\'bridge\')';
  98                                 $sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
  99                                 $sSQL .= ' and indexed_status = 0 ';
 100                                 $sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
 101                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
 102                                 if (CONST_Debug) var_dump($sSQL);
 103                                 $aPlace = $this->oDB->getRow($sSQL);
 104                                 if (PEAR::IsError($aPlace))
 105                                 {
 106                                         failInternalError("Could not determine closest place.", $sSQL, $aPlace);
 107                                 }
 108                                 $iPlaceID = $aPlace['place_id'];
 109                                 $iParentPlaceID = $aPlace['parent_place_id'];
 110                         }
 111
 112                         // The point we found might be too small - use the address to find what it is a child of
 113                         if ($iPlaceID && $iMaxRank < 28)
 114                         {
 115                                 if ($aPlace['rank_search'] > 28 && $iParentPlaceID)
 116                                 {
 117                                         $iPlaceID = $iParentPlaceID;
 118                                 }
 119                                 $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";
 120                                 $iPlaceID = $this->oDB->getOne($sSQL);
 121                                 if (PEAR::IsError($iPlaceID))
 122                                 {
 123                                         failInternalError("Could not get parent for place.", $sSQL, $iPlaceID);
 124                                 }
 125                                 if (!$iPlaceID)
 126                                 {
 127                                         $iPlaceID = $aPlace['place_id'];
 128                                 }
 129                         }
 130
 131                         $oPlaceLookup = new PlaceLookup($this->oDB);
 132                         $oPlaceLookup->setLanguagePreference($this->aLangPrefOrder);
 133                         $oPlaceLookup->setIncludeAddressDetails($this->bAddressDetails);
 134                         $oPlaceLookup->setPlaceId($iPlaceID);
 135
 136                         return $oPlaceLookup->lookup();
 137                 }
 138         }
 139 ?>