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 $aLangPrefOrder = array();
  11
  12                 function ReverseGeocode(&$oDB)
  13                 {
  14                         $this->oDB =& $oDB;
  15                 }
  16
  17                 function setLanguagePreference($aLangPref)
  18                 {
  19                         $this->aLangPrefOrder = $aLangPref;
  20                 }
  21
  22                 function setLatLon($fLat, $fLon)
  23                 {
  24                         $this->fLat = (float)$fLat;
  25                         $this->fLon = (float)$fLon;
  26                 }
  27
  28                 function setRank($iRank)
  29                 {
  30                         $this->iMaxRank = $iRank;
  31                 }
  32
  33                 function setZoom($iZoom)
  34                 {
  35                         // Zoom to rank, this could probably be calculated but a lookup gives fine control
  36                         $aZoomRank = array(
  37                                 0 => 2, // Continent / Sea
  38                                 1 => 2,
  39                                 2 => 2,
  40                                 3 => 4, // Country
  41                                 4 => 4,
  42                                 5 => 8, // State
  43                                 6 => 10, // Region
  44                                 7 => 10,
  45                                 8 => 12, // County
  46                                 9 => 12,
  47                                 10 => 17, // City
  48                                 11 => 17,
  49                                 12 => 18, // Town / Village
  50                                 13 => 18,
  51                                 14 => 22, // Suburb
  52                                 15 => 22,
  53                                 16 => 26, // Street, TODO: major street?
  54                                 17 => 26,
  55                                 18 => 30, // or >, Building
  56                                 19 => 30, // or >, Building
  57                                 );
  58                         $this->iMaxRank = (isset($iZoom) && isset($aZoomRank[$iZoom]))?$aZoomRank[$iZoom]:28;
  59                 }
  60
  61                 function lookup()
  62                 {
  63                         $sPointSQL = 'ST_SetSRID(ST_Point('.$this->fLon.','.$this->fLat.'),4326)';
  64                         $iMaxRank = $this->iMaxRank;
  65                         $iMaxRank_orig = $this->iMaxRank;
  66
  67                         // Find the nearest point
  68                         $fSearchDiam = 0.0004;
  69                         $iPlaceID = null;
  70                         $aArea = false;
  71                         $fMaxAreaDistance = 1;
  72                         $bIsInUnitedStates = false;
  73                         $bPlaceIsTiger = false;
  74                         while(!$iPlaceID && $fSearchDiam < $fMaxAreaDistance)
  75                         {
  76                                 $fSearchDiam = $fSearchDiam * 2;
  77
  78                                 // If we have to expand the search area by a large amount then we need a larger feature
  79                                 // then there is a limit to how small the feature should be
  80                                 if ($fSearchDiam > 2 && $iMaxRank > 4) $iMaxRank = 4;
  81                                 if ($fSearchDiam > 1 && $iMaxRank > 9) $iMaxRank = 8;
  82                                 if ($fSearchDiam > 0.8 && $iMaxRank > 10) $iMaxRank = 10;
  83                                 if ($fSearchDiam > 0.6 && $iMaxRank > 12) $iMaxRank = 12;
  84                                 if ($fSearchDiam > 0.2 && $iMaxRank > 17) $iMaxRank = 17;
  85                                 if ($fSearchDiam > 0.1 && $iMaxRank > 18) $iMaxRank = 18;
  86                                 if ($fSearchDiam > 0.008 && $iMaxRank > 22) $iMaxRank = 22;
  87                                 if ($fSearchDiam > 0.001 && $iMaxRank > 26) $iMaxRank = 26;
  88
  89                                 $sSQL = 'select place_id,parent_place_id,rank_search,calculated_country_code from placex';
  90                                 $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', geometry, '.$fSearchDiam.')';
  91                                 $sSQL .= ' and rank_search != 28 and rank_search >= '.$iMaxRank;
  92                                 $sSQL .= ' and (name is not null or housenumber is not null)';
  93                                 $sSQL .= ' and class not in (\'waterway\',\'railway\',\'tunnel\',\'bridge\',\'man_made\')';
  94                                 $sSQL .= ' and indexed_status = 0 ';
  95                                 $sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
  96                                 $sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
  97                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
  98                                 if (CONST_Debug) var_dump($sSQL);
  99                                 $aPlace = $this->oDB->getRow($sSQL);
 100                                 if (PEAR::IsError($aPlace))
 101                                 {
 102                                         failInternalError("Could not determine closest place.", $sSQL, $aPlace);
 103                                 }
 104                                 $iPlaceID = $aPlace['place_id'];
 105                                 $iParentPlaceID = $aPlace['parent_place_id'];
 106                                 $bIsInUnitedStates = ($aPlace['calculated_country_code'] == 'us');
 107                         }
 108
 109                         // Only street found? If it's in the US we can check TIGER data for nearest housenumber
 110                         if ($bIsInUnitedStates && $iMaxRank_orig >= 28 && $iPlaceID && ($aPlace['rank_search'] == 26 || $aPlace['rank_search'] == 27 ))
 111                         {
 112                                 $fSearchDiam = 0.001;
 113                                 $sSQL = 'SELECT place_id,parent_place_id,30 as rank_search ';
 114                                 if (CONST_Debug) { $sSQL .= ', housenumber, ST_distance('.$sPointSQL.', centroid) as distance, st_y(centroid) as lat, st_x(centroid) as lon'; }
 115                                 $sSQL .= ' FROM location_property_tiger WHERE parent_place_id = '.$iPlaceID;
 116                                 $sSQL .= ' AND ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.')';
 117                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', centroid) ASC limit 1';
 118
 119
 120                                 // print all house numbers in the parent (street)
 121                                 if (CONST_Debug)
 122                                 {
 123                                         $sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
 124                                         var_dump($sSQL);
 125
 126                                         $aAllHouses = $this->oDB->getAll($sSQL);
 127                                         foreach($aAllHouses as $i)
 128                                         {
 129                                                 echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
 130                                         }
 131                                 }
 132
 133                                 $aPlaceTiger = $this->oDB->getRow($sSQL);
 134                                 if (PEAR::IsError($aPlace))
 135                                 {
 136                                         failInternalError("Could not determine closest Tiger place.", $sSQL, $aPlaceTiger);
 137                                 }
 138                                 if ($aPlaceTiger)
 139                                 {
 140                                         if (CONST_Debug) var_dump('found Tiger place', $aPlaceTiger);
 141                                         $bPlaceIsTiger = true;
 142                                         $aPlace = $aPlaceTiger;
 143                                         $iPlaceID = $aPlaceTiger['place_id'];
 144                                         $iParentPlaceID = $aPlaceTiger['parent_place_id']; // the street
 145                                 }
 146                         }
 147
 148                         // The point we found might be too small - use the address to find what it is a child of
 149                         if ($iPlaceID && $iMaxRank < 28)
 150                         {
 151                                 if ($aPlace['rank_search'] > 28 && $iParentPlaceID && !$bPlaceIsTiger)
 152                                 {
 153                                         $iPlaceID = $iParentPlaceID;
 154                                 }
 155                                 $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";
 156                                 $iPlaceID = $this->oDB->getOne($sSQL);
 157                                 if (PEAR::IsError($iPlaceID))
 158                                 {
 159                                         failInternalError("Could not get parent for place.", $sSQL, $iPlaceID);
 160                                 }
 161                                 if (!$iPlaceID)
 162                                 {
 163                                         $iPlaceID = $aPlace['place_id'];
 164                                 }
 165                         }
 166
 167                         return array('place_id' => $iPlaceID,
 168                                              'type' => $bPlaceIsTiger ? 'tiger' : 'osm');
 169                 }
 170         }
 171 ?>