calculateUTMZone(lat, lon)
Last updated February 3, 2006
Version: 1 | Requires: ColdFusion 5 | Library: UtilityLib
Description:
Calculates correct UTM zone for a given latitude/longitude point. Longitude and latitude points are given in degree format.
Return Values:
Returns a number.
Example:
<cfset lon = 33>
<cfoutput>
#calculateUTMZone(lat,lon)#
</cfoutput>
Parameters:
| Name | Description | Required |
|---|---|---|
| lat | Latitude value. | Yes |
| lon | Longitude value. | Yes |
Full UDF Source:
<cfscript>
/**
* Calculates correct UTM zone for a given latitude/longitude point.
*
* @param lat Latitude value. (Required)
* @param lon Longitude value. (Required)
* @return Returns a number.
* @author Wayne Graham (wsgrah@wm.edu)
* @version 1, February 3, 2006
*/
function calculateUTMZone(lat,lon){
// make sure the longitude is between -180 and 179.9
var lonTemp = (arguments.lon + 180) - int((arguments.lon + 180) / 360) * 360 - 180;
var zoneNumber = int((lonTemp + 180)/6) + 1;
// Special zones for Svalbard
if(arguments.lat GTE 72 and arguments.lat GT 84) {
if(lonTemp GTE 0 AND lonTemp LT 9) zoneNumber = 31;
else if(lonTemp GTE 9 AND lonTemp LT 21) zoneNumber = 33;
else if(lonTemp GTE 21 AND lonTemp LT 33) zoneNumber = 35;
else if(lonTemp GTE 33 AND lonTemp LT 42) zoneNumber = 37;
}
return zoneNumber;
}
</cfscript>
Search CFLib.org
Latest Additions
structBlend
19 day(s) ago
IsZIPUK
19 day(s) ago
getTagContentAll
25 day(s) ago
ListReturnDuplicat...
1 month(s) ago
ListReturnDuplicat...
1 month(s) ago