GeoCalculator Class Reference
[GeoCalc]
Collection of useful functions related to geo coordinates. More...
Static Public Member Functions |
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| static | bounding_box ($lat, $lon, $ns_radius, $we_radius) |
| Compute bounding box. |
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| static | bounding_box_of ($arr_coordinates) |
| Compute bounding box of given coordinates.
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| static | distance ($lat1, $lon1, $lat2, $lon2) |
| Calculates distance between to points.
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Public Attributes |
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| const | R = 6371 |
Detailed Description
Collection of useful functions related to geo coordinates.
Definition at line 8 of file geocalculator.cls.php.
Member Function Documentation
| static GeoCalculator::bounding_box | ( | $ | lat, | |
| $ | lon, | |||
| $ | ns_radius, | |||
| $ | we_radius | |||
| ) | [static] |
Compute bounding box.
- Parameters:
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float $lat Latitude float $lon Longitude float $ns_radius Radius of bound box in north to south direction float $we_radius Radius of bound box in west to east direction
- Returns:
- array Array with two elements 'lat' and 'lon', each containing an array with two elements 'min' and 'max
Definition at line 49 of file geocalculator.cls.php.
00049 { 00050 // http://www.movable-type.co.uk/scripts/latlong-db.html 00051 $d_lat = rad2deg($ns_radius/self::R); 00052 $d_lon = rad2deg($we_radius/self::R/cos(deg2rad($lat))); 00053 00054 return array( 00055 'lat' => array('min' => $lat - $d_lat, 'max' => $lat + $d_lat), 00056 'lon' => array('min' => $lon - $d_lon, 'max' => $lon + $d_lon) 00057 ); 00058 }
| static GeoCalculator::bounding_box_of | ( | $ | arr_coordinates | ) | [static] |
Compute bounding box of given coordinates.
GeoCalculator::bounding_box_of(array( array('lat' => 50.96951, 'lon' => 7.0446), array('lat' => 50.92181, 'lon' => 6.9462) );
- Parameters:
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$arr_coordinates Array of associative array with keys "lat" and "lon"
- Returns:
- array Array with two elements 'lat' and 'lon', each containing an array with two elements 'min' and 'max. False if $arr_coordinates is empty
Definition at line 75 of file geocalculator.cls.php.
00075 { 00076 $first = array_shift($arr_coordinates); 00077 if ($first == false) { 00078 return false; 00079 } 00080 $lat_min = Arr::get_item($first, 'lat', 0.0); 00081 $lat_max = $lat_min; 00082 $lon_min = Arr::get_item($first, 'lon', 0.0); 00083 $lon_max = $lon_min; 00084 00085 foreach($arr_coordinates as $c) { 00086 $lat = Arr::get_item($c, 'lat', 0.0); 00087 $lon = Arr::get_item($c, 'lon', 0.0); 00088 $lat_min = min($lat_min, $lat); 00089 $lat_max = max($lat_max, $lat); 00090 $lon_min = min($lon_min, $lon); 00091 $lon_max = max($lon_max, $lon); 00092 } 00093 00094 return array( 00095 'lat' => array('min' => $lat_min, 'max' => $lat_max), 00096 'lon' => array('min' => $lon_min, 'max' => $lon_max) 00097 ); 00098 }
| static GeoCalculator::distance | ( | $ | lat1, | |
| $ | lon1, | |||
| $ | lat2, | |||
| $ | lon2 | |||
| ) | [static] |
Calculates distance between to points.
- Parameters:
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float $lat1 Latitude of point 1; float $lon1 Longitude of point 1; float $lat2 Latitude of point 2; float $lon2 Longitude of point 2;
- Returns:
- float Distance in km
Definition at line 20 of file geocalculator.cls.php.
00020 { 00021 // http://www.movable-type.co.uk/scripts/latlong.html 00022 $lat1 = deg2rad($lat1); 00023 $lat2 = deg2rad($lat2); 00024 $lon1 = deg2rad($lon1); 00025 $lon2 = deg2rad($lon2); 00026 00027 $dLat = $lat2 - $lat1; 00028 $dLon = $lon2 - $lon1; 00029 $a = 00030 sin($dLat/2) * sin($dLat/2) + 00031 cos($lat1) * cos($lat2) * 00032 sin($dLon/2) * sin($dLon/2); 00033 $c = 2 * atan2(sqrt($a), sqrt(1-$a)); 00034 $d = self::R * $c; 00035 return $d; 00036 }
Member Data Documentation
| const GeoCalculator::R = 6371 |
Definition at line 9 of file geocalculator.cls.php.
The documentation for this class was generated from the following file:
- contributions/lib.geocalc/lib/components/geocalculator.cls.php