lib/ReverseGeocode.php

   1 <?php
   2         class ReverseGeocode
   3         {
   4                 protected $oDB;
   5                 protected $iMaxRank = 28;
   6
   7                 function ReverseGeocode(&$oDB)
   8                 {
   9                         $this->oDB =& $oDB;
  10                 }
  11
  12                 function setZoom($iZoom)
  13                 {
  14                         // Zoom to rank, this could probably be calculated but a lookup gives fine control
  15                         $aZoomRank = array(
  16                                 0 => 2, // Continent / Sea
  17                                 1 => 2,
  18                                 2 => 2,
  19                                 3 => 4, // Country
  20                                 4 => 4,
  21                                 5 => 8, // State
  22                                 6 => 10, // Region
  23                                 7 => 10,
  24                                 8 => 12, // County
  25                                 9 => 12,
  26                                 10 => 17, // City
  27                                 11 => 17,
  28                                 12 => 18, // Town / Village
  29                                 13 => 18,
  30                                 14 => 22, // Suburb
  31                                 15 => 22,
  32                                 16 => 26, // Street, TODO: major street?
  33                                 17 => 26,
  34                                 18 => 30, // or >, Building
  35                                 19 => 30, // or >, Building
  36                                 );
  37                         $this->iMaxRank = (isset($iZoom) && isset($aZoomRank[$iZoom]))?$aZoomRank[$iZoom]:28;
  38                 }
  39
  40                 // returns { place_id =>, type => '(osm|tiger)' }
  41                 // fails if no place was found
  42                 function lookup($fLat, $fLon, $bDoInterpolation = true)
  43                 {
  44                         $sPointSQL = 'ST_SetSRID(ST_Point('.$fLon.','.$fLat.'),4326)';
  45                         $iMaxRank = $this->iMaxRank;
  46
  47                         // Find the nearest point
  48                         $fSearchDiam = 0.0004;
  49                         $iPlaceID = null;
  50                         $aArea = false;
  51                         $fMaxAreaDistance = 1;
  52                         $bIsInUnitedStates = false;
  53                         $bPlaceIsTiger = false;
  54                         $bPlaceIsLine = false;
  55                         while(!$iPlaceID && $fSearchDiam < $fMaxAreaDistance)
  56                         {
  57                                 $fSearchDiam = $fSearchDiam * 2;
  58
  59                                 // If we have to expand the search area by a large amount then we need a larger feature
  60                                 // then there is a limit to how small the feature should be
  61                                 if ($fSearchDiam > 2 && $iMaxRank > 4) $iMaxRank = 4;
  62                                 if ($fSearchDiam > 1 && $iMaxRank > 9) $iMaxRank = 8;
  63                                 if ($fSearchDiam > 0.8 && $iMaxRank > 10) $iMaxRank = 10;
  64                                 if ($fSearchDiam > 0.6 && $iMaxRank > 12) $iMaxRank = 12;
  65                                 if ($fSearchDiam > 0.2 && $iMaxRank > 17) $iMaxRank = 17;
  66                                 if ($fSearchDiam > 0.1 && $iMaxRank > 18) $iMaxRank = 18;
  67                                 if ($fSearchDiam > 0.008 && $iMaxRank > 22) $iMaxRank = 22;
  68                                 if ($fSearchDiam > 0.001 && $iMaxRank > 26) $iMaxRank = 26;
  69
  70                                 $sSQL = 'select place_id,parent_place_id,rank_search,calculated_country_code';
  71                                 $sSQL .= ' FROM placex';
  72                                 $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', geometry, '.$fSearchDiam.')';
  73                                 $sSQL .= ' and rank_search != 28 and rank_search >= '.$iMaxRank;
  74                                 $sSQL .= ' and (name is not null or housenumber is not null)';
  75                                 $sSQL .= ' and class not in (\'waterway\',\'railway\',\'tunnel\',\'bridge\',\'man_made\')';
  76                                 $sSQL .= ' and indexed_status = 0 ';
  77                                 $sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
  78                                 $sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
  79                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
  80                                 if (CONST_Debug) var_dump($sSQL);
  81                                 $aPlace = chksql($this->oDB->getRow($sSQL),
  82                                                  "Could not determine closest place.");
  83                                 $iPlaceID = $aPlace['place_id'];
  84                                 $iParentPlaceID = $aPlace['parent_place_id'];
  85                                 $bIsInUnitedStates = ($aPlace['calculated_country_code'] == 'us');
  86                         }
  87                         // if a street or house was found, look in interpolation lines table
  88                         if ($bDoInterpolation && $this->iMaxRank >= 28 && $aPlace && $aPlace['rank_search'] >= 26)
  89                         {
  90                                 // if a house was found, search the interpolation line that is at least as close as the house
  91                                 $sSQL = 'SELECT place_id, parent_place_id, 30 as rank_search, ST_line_locate_point(linegeo,'.$sPointSQL.') as fraction';
  92                                 $sSQL .= ' FROM location_property_osmline';
  93                                 $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';
  94                                 $sSQL .= ' and indexed_status = 0 ';
  95                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
  96
  97                                 if (CONST_Debug)
  98                                 {
  99                                         $sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
 100                                         var_dump($sSQL);
 101
 102                                         $aAllHouses = chksql($this->oDB->getAll($sSQL));
 103                                         foreach($aAllHouses as $i)
 104                                         {
 105                                                 echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
 106                                         }
 107                                 }
 108                                 $aPlaceLine = chksql($this->oDB->getRow($sSQL),
 109                                                      "Could not determine closest housenumber on an osm interpolation line.");
 110                                 if ($aPlaceLine)
 111                                 {
 112                                         if (CONST_Debug) var_dump('found housenumber in interpolation lines table', $aPlaceLine);
 113                                         if ($aPlace['rank_search'] == 30)
 114                                         {
 115                                                 // if a house was already found in placex, we have to find out,
 116                                                 // if the placex house or the interpolated house are closer to the searched point
 117                                                 // distance between point and placex house
 118                                                 $sSQL = 'SELECT ST_distance('.$sPointSQL.', house.geometry) as distance FROM placex as house WHERE house.place_id='.$iPlaceID;
 119                                                 $aDistancePlacex = chksql($this->oDB->getRow($sSQL),
 120                                                                           "Could not determine distance between searched point and placex house.");
 121                                                 $fDistancePlacex = $aDistancePlacex['distance'];
 122                                                 // distance between point and interpolated house (fraction on interpolation line)
 123                                                 $sSQL = 'SELECT ST_distance('.$sPointSQL.', ST_LineInterpolatePoint(linegeo, '.$aPlaceLine['fraction'].')) as distance';
 124                                                 $sSQL .= ' FROM location_property_osmline WHERE place_id = '.$aPlaceLine['place_id'];
 125                                                 $aDistanceInterpolation = chksql($this->oDB->getRow($sSQL),
 126                                                                                  "Could not determine distance between searched point and interpolated house.");
 127                                                 $fDistanceInterpolation = $aDistanceInterpolation['distance'];
 128                                                 if ($fDistanceInterpolation < $fDistancePlacex)
 129                                                 {
 130                                                         // interpolation is closer to point than placex house
 131                                                         $bPlaceIsLine = true;
 132                                                         $aPlace = $aPlaceLine;
 133                                                         $iPlaceID = $aPlaceLine['place_id'];
 134                                                         $iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
 135                                                         $fFraction = $aPlaceLine['fraction'];
 136                                                         $iMaxRank = 30;
 137                                                 }
 138                                                 // else: nothing to do, take placex house from above
 139                                         }
 140                                         else
 141                                         {
 142                                                 $bPlaceIsLine = true;
 143                                                 $aPlace = $aPlaceLine;
 144                                                 $iPlaceID = $aPlaceLine['place_id'];
 145                                                 $iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
 146                                                 $fFraction = $aPlaceLine['fraction'];
 147                                                 $iMaxRank = 30;
 148                                         }
 149                                 }
 150                         }
 151
 152                         // Only street found? If it's in the US we can check TIGER data for nearest housenumber
 153                         if (CONST_Use_US_Tiger_Data && $bDoInterpolation && $bIsInUnitedStates && $this->iMaxRank >= 28 && $iPlaceID && ($aPlace['rank_search'] == 26 || $aPlace['rank_search'] == 27 ))
 154                         {
 155                                 $fSearchDiam = 0.001;
 156                                 $sSQL = 'SELECT place_id,parent_place_id,30 as rank_search, ST_line_locate_point(linegeo,'.$sPointSQL.') as fraction';
 157                                 //if (CONST_Debug) { $sSQL .= ', housenumber, ST_distance('.$sPointSQL.', centroid) as distance, st_y(centroid) as lat, st_x(centroid) as lon'; }
 158                                 $sSQL .= ' FROM location_property_tiger WHERE parent_place_id = '.$iPlaceID;
 159                                 $sSQL .= ' AND ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';  //no centroid anymore in Tiger data, now we have lines
 160                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
 161
 162                                 if (CONST_Debug)
 163                                 {
 164                                         $sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
 165                                         var_dump($sSQL);
 166
 167                                         $aAllHouses = chksql($this->oDB->getAll($sSQL));
 168                                         foreach($aAllHouses as $i)
 169                                         {
 170                                                 echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
 171                                         }
 172                                 }
 173
 174                                 $aPlaceTiger = chksql($this->oDB->getRow($sSQL),
 175                                                       "Could not determine closest Tiger place.");
 176                                 if ($aPlaceTiger)
 177                                 {
 178                                         if (CONST_Debug) var_dump('found Tiger housenumber', $aPlaceTiger);
 179                                         $bPlaceIsTiger = true;
 180                                         $aPlace = $aPlaceTiger;
 181                                         $iPlaceID = $aPlaceTiger['place_id'];
 182                                         $iParentPlaceID = $aPlaceTiger['parent_place_id']; // the street
 183                                         $fFraction = $aPlaceTiger['fraction'];
 184                                         $iMaxRank = 30;
 185                                 }
 186                         }
 187
 188                         // The point we found might be too small - use the address to find what it is a child of
 189                         if ($iPlaceID && $iMaxRank < 28)
 190                         {
 191                                 if (($aPlace['rank_search'] > 28 || $bPlaceIsTiger || $bPlaceIsLine) && $iParentPlaceID)
 192                                 {
 193                                         $iPlaceID = $iParentPlaceID;
 194                                 }
 195                                 $sSQL  = 'select address_place_id';
 196                                 $sSQL .= ' FROM place_addressline';
 197                                 $sSQL .= " WHERE place_id = $iPlaceID";
 198                                 $sSQL .= " ORDER BY abs(cached_rank_address - $iMaxRank) asc,cached_rank_address desc,isaddress desc,distance desc";
 199                                 $sSQL .= ' LIMIT 1';
 200                                 $iPlaceID = chksql($this->oDB->getOne($sSQL),
 201                                                    "Could not get parent for place.");
 202                                 if (!$iPlaceID)
 203                                 {
 204                                         $iPlaceID = $aPlace['place_id'];
 205                                 }
 206                         }
 207                         return array('place_id' => $iPlaceID,
 208                                                 'type' => $bPlaceIsTiger ? 'tiger' : ($bPlaceIsLine ? 'interpolation' : 'osm'),
 209                                                 'fraction' => ($bPlaceIsTiger || $bPlaceIsLine) ? $fFraction : -1);
 210                 }
 211
 212         }
 213 ?>