Where on earth did they get Singapore's 47% from? Here's a land-use map: http://...

Where on earth did they get Singapore's 47% from? Here's a land-use map: http://4.bp.blogspot.com/-C3jx_8qnyo0/UQvXDH4ksdI/AAAAAAAABL...

The light green bits are barely a quarter, and a good chunk of that is agricultural (mostly greenhouses), not "wilderness/open space".