NAME

       Geo::Coordinates::OSGB::Maps - Data for OSGB Maps

SUBROUTINES AND METHODS

       This module exports no functions, but just two hashes of data.

   Hash %name_for_map_series
       The keys are the single letter codes used for each map series.  The values are the descriptive names of
       each series.

       Currently (V2.15) we have

         A : OS Landranger
         B : OS Explorer
         C : OS One-Inch 7th series
         H : Harvey British Mountain Maps
         J : Harvey Superwalker

   Hash %maps
       The keys are short identifiers for each sheet or inset.  Where a map has more than one side, or includes
       insets then, there will be a separate entry for each side and inset.

       The value for each key is another hash containing the following items

       bbox
           The bounding box of the sheet as a list of two pairs of coordinates (in metres from the grid origin)

       polygon
           A list of pairs of coordinates (in metres from grid origin) that define the corners of the sheet.
           The list starts at the SW corner (approximately, on some sheets it's not entirely obvious where to
           start), and works round anticlockwise.  In all cases the last pair is the same as the first pair.

       area
           The calculated area of the sheet in square kilometres

       series
           A single letter series identifier -- this will be one of the keys from the "name_for_map_series" hash

       number
           The identifier for this map within the series, not including any suffix for a sheet or an inset.  The
           two sides of a single map have the same number.  The number is not always an integer - Outdoor
           Leisure maps are designated "OL14" etc.  Those maps known by two numbers have a "number" consisting
           of both numbers divided by a "/"; such as "418/OL60" in the Explorer series.

       parent
           The key of the parent map for an inset.  Main sheets of a map, will have "parent" equal to their own
           key.

       title
           The title of the map.  Different sheets and insets from the same map will have the same title.