# coyote: CGUTMZONE

- coyote/Utilities
- [Source code]

Description

      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.

Categories

      Utility

Params

      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.

Keywords

      formal: out, optional, type=string
        The formal UTM zone designation, with the zone number and band letter combined. For example, "32M".

Examples

      For example, to find the UTM zone for London, England::
         Print, cgUTMZone(-1.062, 51.5171, FORMAL=strDesignation)
             30
         Print, strDesignation
             30U

Author

      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

History

      Written, 8 August 2012.
      Modified to assure the UTM band index is always in range for polar map projections. 22 Sept 2012. DWF.

Copyright

      Copyright (c) 2012, Fanning Software Consulting, Inc.