# coyote: CGGOOGLE_METERSPERPIXEL

- coyote/Utilities
- [Source code]

Description

      This funtion returns the number of meters per pixel for a particular zoom level
      in images returned using Google's Static Image API.

Categories

      Utility

Params

      zoomlevel: in, optional, type=integer, default=12
         The Google zoom level used in retrieving Google Maps using the static image API.
         Documentation: https://developers.google.com/maps/documentation/staticmaps/.

Examples

      For example, to find the meters per pixel for a zoom level of 12::
         IDL> Print, cgGoogle_MetersPerPixel(12)
              38.218514

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, 20 June 2012.
      Updated the algorithm for determining meters per pixel to use WGS-84 equitorial radius
         based on suggestion by Alain LeCacheax. 11 Sept 2012. DWF.

Copyright

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