Found this about the Edible Park in The Hague, run as a permaculture / urban agriculture training centre (although Im not sure to what extent!).
The Netherlands is one of the world’s largest agricultural exporters, but the small, densely populated country is a sprawling collection of towns and suburbs, with little space for gardens in town, and very little greenbelt in between. As a result, Holland has little gardening culture and most of the population is totally divorced from the process of food production.
You can read the article HERE.
And more information about the project from its designers is HERE.
Travelling to The Hague from Rotterdam by train looks to be about 20mins, and costs about 8euro.
The project is part of the Foodprint Project, and a document entitled ‘Foodprint Calculator’ can be found here: Foodprint Calculator – Data and Assumptions
…it seems to give lots of data about the amount of land needed to produce certain elements of a typical diet.