The designation reflects certain environmental qualities (using previously undeveloped or empty greenfield land, for example) and commissioning, planning and construction processes that are generally carried out from scratch.
While a green field in nature is defined as a wide expanse of natural land (meadow, prairie, grassland), here greenfield denotes that a project lacks any constraints imposed upon it by prior work or existing infrastructure.
Such projects can be highly coveted by engineers as no time must be allotted for demolition of unneeded buildings, etc.
constructed in developed areas for the development of the particular place[citation needed] Modern greenfield airports are under construction in Beijing, Istanbul, Sydney and Chennai.
(Many smaller airports are also under development or proposed, especially in China, India and the Philippines asia.)