I might be mistaking but it looks like these formulas would suggest a perfectly round earth, or at least an equally "ratio'd" earth. I'm pretty sure it's not.
Ralph. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian LeRoux Sent: donderdag 14 december 2006 2:36 To: Open Source Flash Mailing List Subject: [osflash] distance between two points of lat/long Getting some slightly 'off' results...anyone w/ a little geodata experience up for checking my math here? Really appreciate any suggestions for improving the code here too! Cheers, Brian function distance( lat1:Number, lon1:Number, lat2:Number, lon2:Number, unit:String ):Number { var theta = lon1 - lon2; var dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta)) dist = Math.acos(dist) dist = rad2deg(dist) var theDistance = dist * 60 * 1.1515 switch( unit ) { case "K": theDistance = distance * 1.609344 break; case "N": theDistance = distance * 0.8684 break; } return theDistance } function deg2rad( n:Number ):Number { return( n * Math.PI / 180 ) } function rad2deg( n:Number ):Number { return( n * 180 / Math.PI ) } _______________________________________________ osflash mailing list [email protected] http://osflash.org/mailman/listinfo/osflash_osflash.org _______________________________________________ osflash mailing list [email protected] http://osflash.org/mailman/listinfo/osflash_osflash.org
