[/============================================================================
  Boost.Geometry Index

  Copyright (c) 2011-2014 Adam Wulkiewicz.

  Use, modification and distribution is subject to the Boost Software License,
  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt)
=============================================================================/]

 spatial query box:
 POLYGON((0 0,0 5,5 5,5 0,0 0))
 spatial query result:
 POLYGON((0 0,0 0.5,0.5 0.5,0.5 0,0 0)) - 0
 POLYGON((1 1,1 1.5,1.5 1.5,1.5 1,1 1)) - 1
 POLYGON((2 2,2 2.5,2.5 2.5,2.5 2,2 2)) - 2
 POLYGON((3 3,3 3.5,3.5 3.5,3.5 3,3 3)) - 3
 POLYGON((4 4,4 4.5,4.5 4.5,4.5 4,4 4)) - 4
 POLYGON((5 5,5 5.5,5.5 5.5,5.5 5,5 5)) - 5
 knn query point:
 POINT(0 0)
 knn query result:
 POLYGON((4 4,4 4.5,4.5 4.5,4.5 4,4 4)) - 4
 POLYGON((3 3,3 3.5,3.5 3.5,3.5 3,3 3)) - 3
 POLYGON((2 2,2 2.5,2.5 2.5,2.5 2,2 2)) - 2
 POLYGON((0 0,0 0.5,0.5 0.5,0.5 0,0 0)) - 0
 POLYGON((1 1,1 1.5,1.5 1.5,1.5 1,1 1)) - 1