By: D

Wed, 27 Jul 2005 00:21:53 +0000

Added n/s e/w for hemisphere, and get lat/long from request…saved me lots of work by the way…thanks!!
< ?php
// convert decimal degrees to degrees/minutes/seconds \\
// some definitions:
// DD=decimal degrees
// DMS=degrees/minutes/seconds
//
// How this works:
// Say you have 32.872352 lat and -91.632563 long
// The whole units of the decimal will remain the same, so
// 1) multiply the decimal by 60 (0.872352 * 60 = 52.34112), the whole number becomes the minutes (52)
// 2) take the remaining decimal (0.34112) and multiply by 60, this is now the seconds, round this to two decimal places (0.34221 * 60 = 20.53)
// 3) string them all together 32 52 20.53
//
// ** LATITUDE ** \\
// DEGREES \\
// get integer value of latitude from db -> where $lat_dd is a floating point number like 32.872352
$lat_dd = $_REQUEST['lat'];
$long_dd = $_REQUEST['long'];
if ($lat_dd<0) $lat_hemi="S";
else $lat_hemi="N";
if ($long_dd<0) $long_hemi="W";
else $long_hemi = "E";
$lat_dd=abs($lat_dd);
$long_dd=abs($long_dd);
$lat_dd_int = intval("$lat_dd");
// MINUTES \\
// get DD minutes (whats after the decimal point)-> Lat DD floating point – lat DD integer
$lat_dd_m = $lat_dd – $lat_dd_int;
// get DMS minutes as floating point -> 60 * DD minutes floating
$lat_dms_m_float = 60 * $lat_dd_m;
// get int value of lat DMS floating point
$lat_dms_m_int = intval(“$lat_dms_m_float”);
// SECONDS \\
// get DD seconds -> DMS minutes floating – DMS minutes integer
$lat_dd_s = $lat_dms_m_float – $lat_dms_m_int;
// convert DD secs to DMS secs -> 60 * DD seconds
$lat_dms_s = 60 * $lat_dd_s;
// ** LONGITUDE ** \\
// DEGREES \\
// get integer value of longitude from db -> where $long_dd is a floating point number like -91.632563
// this number remains negative
$long_dd_int = intval(“$long_dd”);
// MINUTES \\
// get DD minutes (whats after the decimal point)-> Long DD floating point – long DD integer
// use abs to get rid of the negative sign
$long_dd_m = abs($long_dd – $long_dd_int);
// get DMS minutes as floating point -> 60 * DD minutes floating
$long_dms_m_float = 60 * $long_dd_m;
// get int value of long DMS floating
$long_dms_m_int = intval(“$long_dms_m_float”);
// SECONDS \\
// get DD seconds -> DMS minutes floating – DMS minutes integer
$long_dd_s = $long_dms_m_float – $long_dms_m_int;
// convert DD secs to DMS secs -> 60 * DD seconds
$long_dms_s = 60 * $long_dd_s;
// end conversion of lat/long \\
// next just echo the output with the degree/minute/second symbols in place
?>
Latitude: < ?php echo $lat_dd_int; ?>° < ?php echo $lat_dms_m_int; ?>’ < ?php echo round($lat_dms_s, 2); ?>”< ?php echo ($lat_hemi); ?>
Longitude: < ?php echo $long_dd_int; ?>° < ?php echo $long_dms_m_int; ?>’ < ?php echo round($long_dms_s, 2); ?>”< ?php echo ($long_hemi); ?>

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By: D