"Between 2009 and 2012, soil sealing (or imperviousness) increased in most EEA-39 countries by a total of 2 051 km2. "
https://www.eea.europa.eu/data-and-maps/indicators/imperviou...

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Note added at 11 mins (2018-07-11 18:19:10 GMT)
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Definition of Imperviousness Products
Considering the experiences of previous productions and the results of the product validation, we tried to ensure that the following land cover classes are correctly classified as built-up or non-built-up :
a) Objects corresponding to CLC classes 1.3.x (mines, quarries, dump sites and construction sites), which are wrongly considered impervious surfaces.
b) Greenhouses and permanent plastic covered soil shall be classified as impervious surface.
c) Green roofs should not be classified as impervious surfaces, despite their function as
largely sealed surface
d) Beaches, dunes, sand (associated to CLC class 3.3.1), bare rocks (CLC 3.3.2) and sparsely vegetated areas (CLC 3.3.3) and are common sources for misclassification. They do not belong to impervious surfaces."
https://land.copernicus.eu/user-corner/technical-library/hrl...