Other Uses
Examples of greenfield projects are new factories, power plants, airports which are built from scratch on greenfield land. Those facilities which are modified/upgraded are called Brownfield land projects (often the pre-existing site/facilities are contaminated/polluted.)
In transportation industries (e.g. automotive, aircraft, engines) the equivalent concept is called "clean sheet design".
Greenfield also has meaning in sales. A greenfield opportunity refers to a marketplace that is completely untapped and free for the taking.
Read more about this topic: Greenfield Project