CFLib.org – Common Function Library Project

Description:
Determines the correct UTM letter designator for a given latitude; returns Z if latitude is outside UTM limits of 84N to 80S.

Return Values:
Returns a string.

Example:

<cfoutput>#UTMLetterDesignator(37.268946)#</cfoutput>

Parameters:

Full UDF Source:

/**
 * Determines the correct UTM letter designator for a given latitude.
 * 
 * @param lat      Latitude. (Required)
 * @return Returns a string. 
 * @author Wayne Graham (wsgrah@wm.edu) 
 * @version 1, January 26, 2006 
 */
function UTMLetterDesignator(lat){
    var UTMLetter = "Z";
            
    if(84 GTE lat AND lat GTE 72) UTMLetter = "X";
    else if(72 GT lat AND lat GTE 64) UTMLetter = "W";
    else if(64 GT lat AND lat GTE 56) UTMLetter = "V";
    else if (56 GT lat AND lat GTE 48) UTMLetter = "U";
    else if (48 GT lat AND lat GTE 40) UTMLetter = "T";
    else if (40 GT lat AND lat GTE 32) UTMLetter = "S";
    else if (32 GT lat AND lat GTE 24) UTMLetter = "R";
    else if (24 GT lat AND lat GTE 16) UTMLetter = "Q";
    else if (16 GT lat AND lat GTE 8) UTMLetter = "P";
    else if (8 GT lat AND lat GTE 0) UTMLetter = "N";
    else if (0 GT lat AND lat GTE -8) UTMLetter = "M";
    else if (-8 GT lat AND lat GTE -16) UTMLetter = "L";
    else if (-16 GT lat AND lat GTE -32) UTMLetter = "K";
    else if (-32 GT lat AND lat GTE -40) UTMLetter = "J";
    else if (-40 GT lat AND lat GTE -48) UTMLetter = "H";
    else if (-48 GT lat AND lat GTE -56) UTMLetter = "G";
    else if (-56 GT lat AND lat GTE -64) UTMLetter = "F";
    else if (-64 GT lat AND lat GTE -72) UTMLetter = "E";
    else if (-72 GT lat AND lat GTE -80) UTMLetter = "C";
    return UTMLetter;
}