This function returns the correct UTM zone for UTM map projections, given a longitude and latitude value. Southern hemisphere zones are indicated by a negative value.
Utility
longitude: in, required, type=float The requested longitude value east of the central meridian. latitude: in, required, type=float The requested latitude value in the range -90 to 90.
formal: out, optional, type=string The formal UTM zone designation, with the zone number and band letter combined. For example, "32M".
For example, to find the UTM zone for London, England:: Print, cgUTMZone(-1.062, 51.5171, FORMAL=strDesignation) 30 Print, strDesignation 30U
FANNING SOFTWARE CONSULTING:: David W. Fanning 1645 Sheely Drive Fort Collins, CO 80526 USA Phone: 970-221-0438 E-mail: david@idlcoyote.com Coyote's Guide to IDL Programming: http://www.idlcoyote.com
Written, 8 August 2012. Modified to assure the UTM band index is always in range for polar map projections. 22 Sept 2012. DWF.
Copyright (c) 2012, Fanning Software Consulting, Inc.