lib/ReverseGeocode.php

   1 <?php
   2         class ReverseGeocode
   3         {
   4                 protected $oDB;
   5                 protected $iMaxRank = 28;
   6
   7
   8                 function ReverseGeocode(&$oDB)
   9                 {
  10                         $this->oDB =& $oDB;
  11                 }
  12
  13                 function setZoom($iZoom)
  14                 {
  15                         // Zoom to rank, this could probably be calculated but a lookup gives fine control
  16                         $aZoomRank = array(
  17                                 0 => 2, // Continent / Sea
  18                                 1 => 2,
  19                                 2 => 2,
  20                                 3 => 4, // Country
  21                                 4 => 4,
  22                                 5 => 8, // State
  23                                 6 => 10, // Region
  24                                 7 => 10,
  25                                 8 => 12, // County
  26                                 9 => 12,
  27                                 10 => 17, // City
  28                                 11 => 17,
  29                                 12 => 18, // Town / Village
  30                                 13 => 18,
  31                                 14 => 22, // Suburb
  32                                 15 => 22,
  33                                 16 => 26, // Street, TODO: major street?
  34                                 17 => 26,
  35                                 18 => 30, // or >, Building
  36                                 19 => 30, // or >, Building
  37                                 );
  38                         $this->iMaxRank = (isset($iZoom) && isset($aZoomRank[$iZoom]))?$aZoomRank[$iZoom]:28;
  39                 }
  40
  41                 // returns { place_id =>, type => '(osm|tiger)' }
  42                 // fails if no place was found
  43                 function lookup($fLat, $fLon, $bDoInterpolation = true)
  44                 {
  45                         $sPointSQL = 'ST_SetSRID(ST_Point('.$fLon.','.$fLat.'),4326)';
  46                         $iMaxRank = $this->iMaxRank;
  47                         $iMaxRank_orig = $this->iMaxRank;
  48
  49                         // Find the nearest point
  50                         $fSearchDiam = 0.0004;
  51                         $iPlaceID = null;
  52                         $aArea = false;
  53                         $fMaxAreaDistance = 1;
  54                         $bIsInUnitedStates = false;
  55                         $bPlaceIsTiger = false;
  56                         $bPlaceIsLine = false;
  57                         while(!$iPlaceID && $fSearchDiam < $fMaxAreaDistance)
  58                         {
  59                                 $fSearchDiam = $fSearchDiam * 2;
  60
  61                                 // If we have to expand the search area by a large amount then we need a larger feature
  62                                 // then there is a limit to how small the feature should be
  63                                 if ($fSearchDiam > 2 && $iMaxRank > 4) $iMaxRank = 4;
  64                                 if ($fSearchDiam > 1 && $iMaxRank > 9) $iMaxRank = 8;
  65                                 if ($fSearchDiam > 0.8 && $iMaxRank > 10) $iMaxRank = 10;
  66                                 if ($fSearchDiam > 0.6 && $iMaxRank > 12) $iMaxRank = 12;
  67                                 if ($fSearchDiam > 0.2 && $iMaxRank > 17) $iMaxRank = 17;
  68                                 if ($fSearchDiam > 0.1 && $iMaxRank > 18) $iMaxRank = 18;
  69                                 if ($fSearchDiam > 0.008 && $iMaxRank > 22) $iMaxRank = 22;
  70                                 if ($fSearchDiam > 0.001 && $iMaxRank > 26) $iMaxRank = 26;
  71
  72                                 $sSQL = 'select place_id,parent_place_id,rank_search,calculated_country_code';
  73                                 $sSQL .= ' FROM placex';
  74                                 $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', geometry, '.$fSearchDiam.')';
  75                                 $sSQL .= ' and rank_search != 28 and rank_search >= '.$iMaxRank;
  76                                 $sSQL .= ' and (name is not null or housenumber is not null)';
  77                                 $sSQL .= ' and class not in (\'waterway\',\'railway\',\'tunnel\',\'bridge\',\'man_made\')';
  78                                 $sSQL .= ' and indexed_status = 0 ';
  79                                 $sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
  80                                 $sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
  81                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
  82                                 if (CONST_Debug) var_dump($sSQL);
  83                                 $aPlace = chksql($this->oDB->getRow($sSQL),
  84                                                  "Could not determine closest place.");
  85                                 $iPlaceID = $aPlace['place_id'];
  86                                 $iParentPlaceID = $aPlace['parent_place_id'];
  87                                 $bIsInUnitedStates = ($aPlace['calculated_country_code'] == 'us');
  88                         }
  89                         // if a street or house was found, look in interpolation lines table
  90                         if ($bDoInterpolation && $iMaxRank_orig >= 28 && $aPlace && $aPlace['rank_search'] >= 26)
  91                         {
  92                                 // if a house was found, search the interpolation line that is at least as close as the house
  93                                 $sSQL = 'SELECT place_id, parent_place_id, 30 as rank_search, ST_line_locate_point(linegeo,'.$sPointSQL.') as fraction';
  94                                 $sSQL .= ' FROM location_property_osmline';
  95                                 $sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';
  96                                 $sSQL .= ' and indexed_status = 0 ';
  97                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
  98
  99                                 if (CONST_Debug)
 100                                 {
 101                                         $sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
 102                                         var_dump($sSQL);
 103
 104                                         $aAllHouses = chksql($this->oDB->getAll($sSQL));
 105                                         foreach($aAllHouses as $i)
 106                                         {
 107                                                 echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
 108                                         }
 109                                 }
 110                                 $aPlaceLine = chksql($this->oDB->getRow($sSQL),
 111                                                      "Could not determine closest housenumber on an osm interpolation line.");
 112                                 if ($aPlaceLine)
 113                                 {
 114                                         if (CONST_Debug) var_dump('found housenumber in interpolation lines table', $aPlaceLine);
 115                                         if ($aPlace['rank_search'] == 30)
 116                                         {
 117                                                 // if a house was already found in placex, we have to find out,
 118                                                 // if the placex house or the interpolated house are closer to the searched point
 119                                                 // distance between point and placex house
 120                                                 $sSQL = 'SELECT ST_distance('.$sPointSQL.', house.geometry) as distance FROM placex as house WHERE house.place_id='.$iPlaceID;
 121                                                 $aDistancePlacex = chksql($this->oDB->getRow($sSQL),
 122                                                                           "Could not determine distance between searched point and placex house.");
 123                                                 $fDistancePlacex = $aDistancePlacex['distance'];
 124                                                 // distance between point and interpolated house (fraction on interpolation line)
 125                                                 $sSQL = 'SELECT ST_distance('.$sPointSQL.', ST_LineInterpolatePoint(linegeo, '.$aPlaceLine['fraction'].')) as distance';
 126                                                 $sSQL .= ' FROM location_property_osmline WHERE place_id = '.$aPlaceLine['place_id'];
 127                                                 $aDistanceInterpolation = chksql($this->oDB->getRow($sSQL),
 128                                                                                  "Could not determine distance between searched point and interpolated house.");
 129                                                 $fDistanceInterpolation = $aDistanceInterpolation['distance'];
 130                                                 if ($fDistanceInterpolation < $fDistancePlacex)
 131                                                 {
 132                                                         // interpolation is closer to point than placex house
 133                                                         $bPlaceIsLine = true;
 134                                                         $aPlace = $aPlaceLine;
 135                                                         $iPlaceID = $aPlaceLine['place_id'];
 136                                                         $iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
 137                                                         $fFraction = $aPlaceLine['fraction'];
 138                                                         $iMaxRank = 30;
 139                                                 }
 140                                                 // else: nothing to do, take placex house from above
 141                                         }
 142                                         else
 143                                         {
 144                                                 $bPlaceIsLine = true;
 145                                                 $aPlace = $aPlaceLine;
 146                                                 $iPlaceID = $aPlaceLine['place_id'];
 147                                                 $iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
 148                                                 $fFraction = $aPlaceLine['fraction'];
 149                                                 $iMaxRank = 30;
 150                                         }
 151                                 }
 152                         }
 153
 154                         // Only street found? If it's in the US we can check TIGER data for nearest housenumber
 155                         if (CONST_Use_US_Tiger_Data && $bDoInterpolation && $bIsInUnitedStates && $iMaxRank_orig >= 28 && $iPlaceID && ($aPlace['rank_search'] == 26 || $aPlace['rank_search'] == 27 ))
 156                         {
 157                                 $fSearchDiam = 0.001;
 158                                 $sSQL = 'SELECT place_id,parent_place_id,30 as rank_search, ST_line_locate_point(linegeo,'.$sPointSQL.') as fraction';
 159                                 //if (CONST_Debug) { $sSQL .= ', housenumber, ST_distance('.$sPointSQL.', centroid) as distance, st_y(centroid) as lat, st_x(centroid) as lon'; }
 160                                 $sSQL .= ' FROM location_property_tiger WHERE parent_place_id = '.$iPlaceID;
 161                                 $sSQL .= ' AND ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';  //no centroid anymore in Tiger data, now we have lines
 162                                 $sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
 163
 164                                 if (CONST_Debug)
 165                                 {
 166                                         $sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
 167                                         var_dump($sSQL);
 168
 169                                         $aAllHouses = chksql($this->oDB->getAll($sSQL));
 170                                         foreach($aAllHouses as $i)
 171                                         {
 172                                                 echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
 173                                         }
 174                                 }
 175
 176                                 $aPlaceTiger = chksql($this->oDB->getRow($sSQL),
 177                                                       "Could not determine closest Tiger place.");
 178                                 if ($aPlaceTiger)
 179                                 {
 180                                         if (CONST_Debug) var_dump('found Tiger housenumber', $aPlaceTiger);
 181                                         $bPlaceIsTiger = true;
 182                                         $aPlace = $aPlaceTiger;
 183                                         $iPlaceID = $aPlaceTiger['place_id'];
 184                                         $iParentPlaceID = $aPlaceTiger['parent_place_id']; // the street
 185                                         $fFraction = $aPlaceTiger['fraction'];
 186                                         $iMaxRank = 30;
 187                                 }
 188                         }
 189
 190                         // The point we found might be too small - use the address to find what it is a child of
 191                         if ($iPlaceID && $iMaxRank < 28)
 192                         {
 193                                 if (($aPlace['rank_search'] > 28 || $bPlaceIsTiger || $bPlaceIsLine) && $iParentPlaceID)
 194                                 {
 195                                         $iPlaceID = $iParentPlaceID;
 196                                 }
 197                                 $sSQL  = 'select address_place_id';
 198                                 $sSQL .= ' FROM place_addressline';
 199                                 $sSQL .= " WHERE place_id = $iPlaceID";
 200                                 $sSQL .= " ORDER BY abs(cached_rank_address - $iMaxRank) asc,cached_rank_address desc,isaddress desc,distance desc";
 201                                 $sSQL .= ' LIMIT 1';
 202                                 $iPlaceID = chksql($this->oDB->getOne($sSQL),
 203                                                    "Could not get parent for place.");
 204                                 if (!$iPlaceID)
 205                                 {
 206                                         $iPlaceID = $aPlace['place_id'];
 207                                 }
 208                         }
 209                         return array('place_id' => $iPlaceID,
 210                                                 'type' => $bPlaceIsTiger ? 'tiger' : ($bPlaceIsLine ? 'interpolation' : 'osm'),
 211                                                 'fraction' => ($bPlaceIsTiger || $bPlaceIsLine) ? $fFraction : -1);
 212                 }
 213
 214         }
 215 ?>