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[转载]php google地图经纬度与x,y的对应关系

分类： Python/Ruby

2012-02-29 11:08:02

php根据google地图的经纬度坐标获取此点周围的12张图片

附件下载地址为：

运行文件get_picture.php代码如下：
  1. <?php


  4. require( './latitudeLongitudeClass.php' );

  6. $latitude = $_GET['latitude'] ? $_GET['latitude'] : 0;
  7. $longitude = $_GET['longitude'] ? $_GET['longitude'] : 0;
  8. $zoom = $_GET['zoom'] ? $_GET['zoom'] : 0;

  10. $LatitudeLongitudeClass = new LatitudeLongitudeClass( $latitude, $longitude, $zoom );

  12. $centrepoint_info = $LatitudeLongitudeClass->getCentrepointInfo();
  13. $time = time();
  14. ?>

  16. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
  17. <html xmlns="">
  18. <head>
  19. <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  20. <title>路况地图显示</title>
  21. </head>
  22. <body>

  24. <table width="1024" border="0" cellspacing="0" cellpadding="0" style="position: absolute; top: 20px; left: 20px; z-index: 1;">
  25. <tr>
  26. <td colspan="4" height="50" align="center">左上角坐标(<?php echo $centrepoint_info['upper_left']['left_up']['latitude']; ?>,<?php echo $centrepoint_info['upper_left']['left_up']['longitude']; ?>)；
  27. 原始点坐标(<?php echo $centrepoint_info['centrepoint']['original']['latitude']; ?>,<?php echo $centrepoint_info['centrepoint']['original']['longitude']; ?>)</td>
  28. </tr>
  29. <tr>
  30. <td width="256"><img src=" echo $centrepoint_info['00']['x']; ?>&y=&z=&t=" /></td>
  31. <td width="256"><img src=" echo $centrepoint_info['01']['x']; ?>&y=&z=&t=" /></td>
  32. <td width="256"><img src=" echo $centrepoint_info['02']['x']; ?>&y=&z=&t=" /></td>
  33. <td width="256"><img src=" echo $centrepoint_info['03']['x']; ?>&y=&z=&t=" /></td>
  34. </tr>
  35. <tr>
  36. <td width="256"><img src=" echo $centrepoint_info['10']['x']; ?>&y=&z=&t=" /></td>
  37. <td width="256"><img src=" echo $centrepoint_info['11']['x']; ?>&y=&z=&t=" /></td>
  38. <td width="256"><img src=" echo $centrepoint_info['12']['x']; ?>&y=&z=&t=" /></td>
  39. <td width="256"><img src=" echo $centrepoint_info['13']['x']; ?>&y=&z=&t=" /></td>
  40. </tr>
  41. <tr>
  42. <td width="256"><img src=" echo $centrepoint_info['20']['x']; ?>&y=&z=&t=" /></td>
  43. <td width="256"><img src=" echo $centrepoint_info['21']['x']; ?>&y=&z=&t=" /></td>
  44. <td width="256"><img src=" echo $centrepoint_info['22']['x']; ?>&y=&z=&t=" /></td>
  45. <td width="256"><img src=" echo $centrepoint_info['23']['x']; ?>&y=&z=&t=" /></td>
  46. </tr>
  47. <tr>
  48. <td width="256"><img src=" echo $centrepoint_info['30']['x']; ?>&y=&z=&t=" /></td>
  49. <td width="256"><img src=" echo $centrepoint_info['31']['x']; ?>&y=&z=&t=" /></td>
  50. <td width="256"><img src=" echo $centrepoint_info['32']['x']; ?>&y=&z=&t=" /></td>
  51. <td width="256"><img src=" echo $centrepoint_info['33']['x']; ?>&y=&z=&t=" /></td>
  52. </tr>
  53. </table>


  56. <table width="1024" border="0" cellspacing="0" cellpadding="0" style="position: absolute; top: 20px; left: 20px; z-index: 2;">
  57. <tr>
  58. <td colspan="4" height="50" align="center">左上角坐标(<?php echo $centrepoint_info['upper_left']['left_up']['latitude']; ?>,<?php echo $centrepoint_info['upper_left']['left_up']['longitude']; ?>)；
  59. 原始点坐标(<?php echo $centrepoint_info['centrepoint']['original']['latitude']; ?>,<?php echo $centrepoint_info['centrepoint']['original']['longitude']; ?>)</td>
  60. </tr>
  61. <tr>
  62. <td width="256"><img src=" echo $centrepoint_info['00']['x']; ?>&y=&zoom=&t=" /></td>
  63. <td width="256"><img src=" echo $centrepoint_info['01']['x']; ?>&y=&zoom=&t=" /></td>
  64. <td width="256"><img src=" echo $centrepoint_info['02']['x']; ?>&y=&zoom=&t=" /></td>
  65. <td width="256"><img src=" echo $centrepoint_info['03']['x']; ?>&y=&zoom=&t=" /></td>
  66. </tr>
  67. <tr>
  68. <td width="256"><img src=" echo $centrepoint_info['10']['x']; ?>&y=&zoom=&t=" /></td>
  69. <td width="256"><img src=" echo $centrepoint_info['11']['x']; ?>&y=&zoom=&t=" /></td>
  70. <td width="256"><img src=" echo $centrepoint_info['12']['x']; ?>&y=&zoom=&t=" /></td>
  71. <td width="256"><img src=" echo $centrepoint_info['13']['x']; ?>&y=&zoom=&t=" /></td>
  72. </tr>
  73. <tr>
  74. <td width="256"><img src=" echo $centrepoint_info['20']['x']; ?>&y=&zoom=&t=" /></td>
  75. <td width="256"><img src=" echo $centrepoint_info['21']['x']; ?>&y=&zoom=&t=" /></td>
  76. <td width="256"><img src=" echo $centrepoint_info['22']['x']; ?>&y=&zoom=&t=" /></td>
  77. <td width="256"><img src=" echo $centrepoint_info['23']['x']; ?>&y=&zoom=&t=" /></td>
  78. </tr>
  79. <tr>
  80. <td width="256"><img src=" echo $centrepoint_info['30']['x']; ?>&y=&zoom=&t=" /></td>
  81. <td width="256"><img src=" echo $centrepoint_info['31']['x']; ?>&y=&zoom=&t=" /></td>
  82. <td width="256"><img src=" echo $centrepoint_info['32']['x']; ?>&y=&zoom=&t=" /></td>
  83. <td width="256"><img src=" echo $centrepoint_info['33']['x']; ?>&y=&zoom=&t=" /></td>
  84. </tr>
  85. </table>
  86. </body>
  87. </html>

  89. 处理类文件latitudeLongitudeClass.php代码如下：
  90. <?php


  93. class LatitudeLongitudeClass
  94. {
  95.    
  96.     var $longitude_input;
  97.    
  98.    
  99.     var $latitude_input;
  100.    
  101.    
  102.     var $zoom;
  103.    
  104.    
  105.     var $pi = M_PI;
  106.    
  107.    
  108.     var $centrepoint_around_detail;
  109.    
  110.    
  111.     function __construct( $lati, $longi, $zoom )
  112.     {
  113.         $this->latitude_input = $lati;
  114.         $this->longitude_input = $longi;
  115.         $this->zoom = $zoom;
  116.     }
  117.    
  118.    
  119.     function getMercatorLongitude()
  120.     {
  121.         $longitude = 180 + $this->longitude_input;
  122.        
  123.         $long_tile_size = 360 / ( pow( 2, ( 17 - $this->zoom ) ) );
  124.    
  125.         $tile_x=(int)( $longitude / $long_tile_size );
  126.        
  127.         return $tile_x;
  128.     }
  129.    
  130.    
  131.     function getMercatorLatitude()
  132.     {
  133.         $latitude = $this->latitude_input;
  134.       
  135.         $latitude = ( $latitude > 90 ) ? $latitude - 180 : $latitude;
  136.        
  137.         $latitude = ( $latitude < -90 ) ? $latitude + 180 : $latitude;
  138.    
  139.         $phi = $this->pi * $latitude / 180;
  140.    
  141.         $res = 0.5 * log( ( 1 + sin( $phi ) ) / ( 1 - sin( $phi ) ) );
  142.        
  143.         $tile_y = (int)( ( ( 1 - $res / $this->pi ) / 2 ) * pow( 2, ( 17 - $this->zoom ) ) );
  144.    
  145.         return $tile_y;
  146.     }
  147.    
  148.    
  149.     function aGetMercatorLongitude( $tile_x )
  150.     {
  151.         $min_longitude = round( 360 * $tile_x / pow( 2, ( 17 - $this->zoom ) ) - 180, 6 );
  152.        
  153.         $max_longitude = round( 360 * ( $tile_x + 1) / pow( 2, ( 17 - $this->zoom ) ) - 180, 6 );
  154.        
  155.         $average_longitude = ( $max_longitude + $min_longitude ) / 2;
  156.        
  157.         $longitude_min_max = array(
  158.                 'min' => $min_longitude,
  159.                 'max' => $max_longitude,
  160.                 'average' => $average_longitude
  161.         );
  162.        
  163.         return $longitude_min_max;
  164.     }
  165.    
  166.    
  167.     function aGetMercatorLatitude( $title_y )
  168.     {
  169.         $r_min = -( $title_y + 1 - pow( 2, ( 17 - $this->zoom - 1 ) ) ) * $this->pi / pow( 2, ( 17 - $this->zoom - 1 ) );
  170.         $r_max = -( $title_y - pow( 2, ( 17 - $this->zoom - 1 ) ) ) * $this->pi / pow( 2, ( 17 - $this->zoom - 1 ) );
  171.        
  172.         $log_min = 2 * $r_min;
  173.         $log_max = 2 * $r_max;
  174.        
  175.         $log_N_min = exp( $log_min );
  176.         $log_N_max = exp( $log_max );
  177.        
  178.         $sin_min = ( $log_N_min - 1 ) / ( $log_N_min + 1 );
  179.         $sin_max = ( $log_N_max - 1 ) / ( $log_N_max + 1 );
  180.        
  181.         $min_latitude = round( asin( $sin_min ) * 180 / $this->pi, 6 );
  182.         $max_latitude = round( asin( $sin_max ) * 180 / $this->pi, 6 );
  183.        
  184.         $average_latitude = ( $max_latitude + $min_latitude ) / 2;
  185.        
  186.         $latitude_min_max = array(
  187.                 'min' => $min_latitude,
  188.                 'max' => $max_latitude,
  189.                 'average' => $average_latitude
  190.         );
  191.        
  192.         return $latitude_min_max;
  193.     }
  194.    
  195.    
  196.     function getCentrepointInfo()
  197.     {
  198.         $title_x = $this->getMercatorLongitude();
  199.         $title_y = $this->getMercatorLatitude();
  200.        
  201.         $longitude_interval = $this->aGetMercatorLongitude( $title_x );
  202.         $latitude_interval = $this->aGetMercatorLatitude( $title_y );
  203.        
  204.         // 中心点信息
  205.         $this->centrepoint_around_detail['centrepoint'] = array(
  206.                     'x' => $title_x,
  207.                     'y' => $title_y,
  208.                     'left_up' => array( 'latitude' => $latitude_interval['max'], 'longitude' => $longitude_interval['min'] ),
  209.                     'left_down' => array( 'latitude' => $latitude_interval['min'], 'longitude' => $longitude_interval['min'] ),
  210.                     'right_up' => array( 'latitude' => $latitude_interval['max'], 'longitude' => $longitude_interval['max'] ),
  211.                     'right_down' => array( 'latitude' => $latitude_interval['min'], 'longitude' => $longitude_interval['max'] ),
  212.                     'midpoint' => array( 'latitude' => $latitude_interval['average'], 'longitude' => $longitude_interval['average'] ),
  213.                     'original' => array( 'latitude' => $this->latitude_input, 'longitude' => $this->longitude_input )
  214.         );
  215.        
  216.         $this->setCentrepointAroundBlock();
  217.        
  218.         return $this->centrepoint_around_detail;
  219.     }
  220.    
  221.    
  222.     function setCentrepointAroundBlock()
  223.     {
  224.         $title_x = $this->centrepoint_around_detail['centrepoint']['x'];
  225.         $title_y = $this->centrepoint_around_detail['centrepoint']['y'];
  226.        
  227.         $mid_latitude = $this->centrepoint_around_detail['centrepoint']['midpoint']['latitude'];
  228.         $mid_longitude = $this->centrepoint_around_detail['centrepoint']['midpoint']['longitude'];
  229.        
  230.         $cur_latitude = $this->latitude_input;
  231.         $cur_longitude = $this->longitude_input;
  232.        
  233.         //由中心点在图片位置确定左上角图片的偏移量
  234.         if( $mid_longitude - $cur_longitude > 0 ) {
  235.            
  236.             //瓦片左边
  237.             if( $mid_latitude - $cur_latitude > 0 ) {
  238.                
  239.                 // 瓦片左下
  240.                 $x_start = -2;
  241.                 $y_start = -1;
  242.             } else {
  243.                 $x_start = -2;
  244.                 $y_start = -2;
  245.             }
  246.         } else {
  247.            
  248.             //瓦片右边
  249.             if( $mid_latitude - $cur_latitude > 0 ) {
  250.                
  251.                 //瓦片右下
  252.                 $x_start = -1;
  253.                 $y_start = -1;
  254.             } else {
  255.                 $x_start = -1;
  256.                 $y_start = -2;
  257.             }
  258.         }
  259.        
  260.         // 12张图中图片左上角点信息
  261.         $lu_title_x = $title_x + $x_start;
  262.         $lu_title_y = $title_y + $y_start;
  263.         $lu_longitude_interval = $this->aGetMercatorLongitude( $lu_title_x );
  264.         $lu_latitude_interval = $this->aGetMercatorLatitude( $lu_title_y );
  265.        
  266.         $this->centrepoint_around_detail['upper_left'] = array(
  267.                     'x' => $lu_title_x,
  268.                     'y' => $lu_title_y,
  269.                     'left_up' => array( 'latitude' => $lu_latitude_interval['max'], 'longitude' => $lu_longitude_interval['min'] ),
  270.                     'left_down' => array( 'latitude' => $lu_latitude_interval['min'], 'longitude' => $lu_longitude_interval['min'] ),
  271.                     'right_up' => array( 'latitude' => $lu_latitude_interval['max'], 'longitude' => $lu_longitude_interval['max'] ),
  272.                     'right_down' => array( 'latitude' => $lu_latitude_interval['min'], 'longitude' => $lu_longitude_interval['max'] )
  273.         );
  274.        
  275.         for( $i = 0; $i < 4; $i++ )
  276.         {
  277.             $y_extent = $y_start + $i;
  278.             for( $j = 0; $j < 4; $j++ )
  279.             {
  280.                 $x_extent = $x_start + $j;
  281.                 $key = $i . $j;
  282.                 $this->centrepoint_around_detail[$key] = array( 'x' => $title_x + $x_extent, 'y' => $title_y + $y_extent );
  283.             }
  284.         }
  285.     }
  286.    
  287. }
  288. ?>
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