Name	Notation	Description	Types	Status
Chaotic (City centre with high and low-rise buildings)	chaotic	Centres of large towns with mixture of low-rise and high-rise...	Concept	stable
Closed (Regular large obstacle COVER (suburb, forest))	closed	Landscape totally and quite regularly covered with similar si...	Concept	stable
inapplicable	inapplicable	None of the codes in the table are applicable in the context ...	Concept	stable
Open (Open flat terrain; grass, few isolated obstacles)	open	Level country with low vegetation (e.g. grass) and isolated o...	Concept	stable
Rough (High crops; scattered obstacles, 15 < x/H < 20)	rough	Recently-developed 'young' landscape with high crops or crops...	Concept	stable
Roughly open (Low crops; occasional large obstacles, x/H > 20)	roughlyOpen	Cultivated area with regular cover of low crops, or moderatel...	Concept	stable
Sea (open water, tidal flat, snow with fetch above 3 km	sea	Open sea or lake (irrespective of the wave size), tidal flat,...	Concept	stable
Smooth (Mud flats, snow; no vegetation, no obstacles)	smooth	Featureless land surface without any noticeable obstacles and...	Concept	stable
unknown	unknown	The surface roughness is unknown.	Concept	stable
Very rough (Parkland, bushes; numerous obstacles, x/H ~ 10)	veryRough	'Old' cultivated landscape with many rather large obstacle gr...	Concept	stable