/**
* 逆ジオコーディング
* 引数の緯度経度に近い地理情報を近い順に複数返す。
*
* @param float $lat 緯度
* @param float $lng 軽度
* @param int $limit 取得件数
* @return Dm_Geocoder_Address[]
*/
public static function reverseGeocode($lat, $lng, $limit = 10)
{
$prefectures = array_keys(Dm_Geocoder_Prefecture::get());
$addressList = array();
//都道府県のCSV毎ループ
foreach ($prefectures as $prefecture) {
$location = Dm_Geocoder_Prefecture::getLocation($prefecture);
$tolerance = 1.0;
//ある程度の範囲までを対象とする
if ($location['minLat'] - $tolerance > $lat) {
continue;
}
if ($location['maxLat'] + $tolerance < $lat) {
continue;
}
if ($location['minLng'] - $tolerance > $lng) {
continue;
}
if ($location['maxLng'] + $tolerance < $lng) {
continue;
}
$reader = new Dm_Geocoder_GISCSV_Reader($prefecture);
// CSVの１行毎にループ
// $rowはDm_Geocoder_Addressオブジェクト
foreach ($reader as $key => $row) {
$count = count($addressList);
$distance = self::location_distance($row->lat, $row->lng, $lat, $lng);
if ($count < $limit) {
$addressList[] = array('address' => $row, 'distance' => $distance['distance']);
//１件目なら後続の処理は飛ばす
if ($count === 0) {
continue;
}
//距離順にソート
usort($addressList, array(__CLASS__, 'compareDistance'));
} else {
//保持している中で一番遠いaddressオブジェクト
$end = end($addressList);
$endDistance = $end['distance'];
$nowDistance = self::location_distance($row->lat, $row->lng, $lat, $lng);
$nowDistance = $nowDistance['distance'];
if ($endDistance > $nowDistance) {
$addressList[] = array('address' => $row, 'distance' => $distance['distance']);
//近い順にソートする
usort($addressList, array(__CLASS__, 'compareDistance'));
//1つ追加したので、（一番遠い）末尾から1つ削除する
array_pop($addressList);
}
}
}
}
foreach ($addressList as $key => $row) {
$addressList[$key] = $row['address'];
}
return $addressList;
}
