-// returns boolean
-function validLatLon($fLat,$fLon)
-{
- return ($fLat <= 90.1 && $fLat >= -90.1 && $fLon <= 180.1 && $fLon >= -180.1);
-}
-
-// Do we have anything that looks like a lat/lon pair?
-// returns array(lat,lon,query_with_lat_lon_removed)
-// or null
-function looksLikeLatLonPair($sQuery)
-{
- $sFound = null;
- $fQueryLat = null;
- $fQueryLon = null;
-
- if (preg_match('/\\b([NS])[ ]+([0-9]+[0-9.]*)[° ]+([0-9.]+)?[′\']*[, ]+([EW])[ ]+([0-9]+)[° ]+([0-9]+[0-9.]*)[′\']*?\\b/', $sQuery, $aData)) {
- // 1 2 3 4 5 6
- // degrees decimal minutes
- // N 40 26.767, W 79 58.933
- // N 40°26.767′, W 79°58.933′
- $sFound = $aData[0];
- $fQueryLat = ($aData[1]=='N'?1:-1) * ($aData[2] + $aData[3]/60);
- $fQueryLon = ($aData[4]=='E'?1:-1) * ($aData[5] + $aData[6]/60);
- } elseif (preg_match('/\\b([0-9]+)[° ]+([0-9]+[0-9.]*)?[′\']*[ ]+([NS])[, ]+([0-9]+)[° ]+([0-9]+[0-9.]*)?[′\' ]+([EW])\\b/', $sQuery, $aData)) {
- // 1 2 3 4 5 6
- // degrees decimal minutes
- // 40 26.767 N, 79 58.933 W
- // 40° 26.767′ N 79° 58.933′ W
- $sFound = $aData[0];
- $fQueryLat = ($aData[3]=='N'?1:-1) * ($aData[1] + $aData[2]/60);
- $fQueryLon = ($aData[6]=='E'?1:-1) * ($aData[4] + $aData[5]/60);
- } elseif (preg_match('/\\b([NS])[ ]([0-9]+)[° ]+([0-9]+)[′\' ]+([0-9]+)[″"]*[, ]+([EW])[ ]([0-9]+)[° ]+([0-9]+)[′\' ]+([0-9]+)[″"]*\\b/', $sQuery, $aData)) {
- // 1 2 3 4 5 6 7 8
- // degrees decimal seconds
- // N 40 26 46 W 79 58 56
- // N 40° 26′ 46″, W 79° 58′ 56″
- $sFound = $aData[0];
- $fQueryLat = ($aData[1]=='N'?1:-1) * ($aData[2] + $aData[3]/60 + $aData[4]/3600);
- $fQueryLon = ($aData[5]=='E'?1:-1) * ($aData[6] + $aData[7]/60 + $aData[8]/3600);
- } elseif (preg_match('/\\b([0-9]+)[° ]+([0-9]+)[′\' ]+([0-9]+)[″" ]+([NS])[, ]+([0-9]+)[° ]+([0-9]+)[′\' ]+([0-9]+)[″" ]+([EW])\\b/', $sQuery, $aData)) {
- // 1 2 3 4 5 6 7 8
- // degrees decimal seconds
- // 40 26 46 N 79 58 56 W
- // 40° 26′ 46″ N, 79° 58′ 56″ W
- $sFound = $aData[0];
- $fQueryLat = ($aData[4]=='N'?1:-1) * ($aData[1] + $aData[2]/60 + $aData[3]/3600);
- $fQueryLon = ($aData[8]=='E'?1:-1) * ($aData[5] + $aData[6]/60 + $aData[7]/3600);
- } elseif (preg_match('/\\b([NS])[ ]([0-9]+[0-9]*\\.[0-9]+)[°]*[, ]+([EW])[ ]([0-9]+[0-9]*\\.[0-9]+)[°]*\\b/', $sQuery, $aData)) {
- // 1 2 3 4
- // degrees decimal
- // N 40.446° W 79.982°
- $sFound = $aData[0];
- $fQueryLat = ($aData[1]=='N'?1:-1) * ($aData[2]);
- $fQueryLon = ($aData[3]=='E'?1:-1) * ($aData[4]);
- } elseif (preg_match('/\\b([0-9]+[0-9]*\\.[0-9]+)[° ]+([NS])[, ]+([0-9]+[0-9]*\\.[0-9]+)[° ]+([EW])\\b/', $sQuery, $aData)) {
- // 1 2 3 4
- // degrees decimal
- // 40.446° N 79.982° W
- $sFound = $aData[0];
- $fQueryLat = ($aData[2]=='N'?1:-1) * ($aData[1]);
- $fQueryLon = ($aData[4]=='E'?1:-1) * ($aData[3]);
- } elseif (preg_match('/(\\[|^|\\b)(-?[0-9]+[0-9]*\\.[0-9]+)[, ]+(-?[0-9]+[0-9]*\\.[0-9]+)(\\]|$|\\b)/', $sQuery, $aData)) {
- // 1 2 3 4
- // degrees decimal
- // 12.34, 56.78
- // [12.456,-78.90]
- $sFound = $aData[0];
- $fQueryLat = $aData[2];
- $fQueryLon = $aData[3];
- }
-
- if (!validLatLon($fQueryLat, $fQueryLon)) return;
- $sQuery = trim(str_replace($sFound, ' ', $sQuery));
-
- return array('lat' => $fQueryLat, 'lon' => $fQueryLon, 'query' => $sQuery);
-}
-