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Vegetation type	Assigned vegetation height	Assigned vegetation coverage	Vegetation type	Assigned vegetation height	Assigned vegetation coverage

Evergreen needleleaf needle leaf trees	H	0.90	Bogs and marshes	L	0.60
Deciduous needleleaf needle leaf trees	H	0.90	Water and land mixtures	L	0.60
Evergreen broadleaf broad leaf trees	H	0.90
Deciduous broadleaf broad leaf trees	H	0.90	Tundra	L	0.50
Mixed forest / woodland	H	0.90	Semidesert	L	0.10
Interrupted forest	H	0.90	Desert	–	–

Irrigated crops	L	0.90
Crops, mixed farming	L	0.90
Short grass	L	0.85
Tall grass	L	0.70	Ice caps and glaciers	–	–
Evergreen shrubs	L	0.50	Inland water	–	–
Deciduous shrubs	L	0.50	Ocean	–	–

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Fig2.1.4.1-2: An example of the variability of land surface within an approximate grid box illustrating the difficulty in assigning a representative HTESSEL "tiles" for the whole grid square area. The red lines show the extent of a very approximate 9km x 9km schematic HRES and ENS grid square. The flag locates the grid point. There is some variation in ground surface type but it is predominantly covered by evergreen needle-leaf needle leaf trees. The proportional contribution to the heat, moisture and momentum fluxes are rather simpler to assess. In winter snow the appropriate tile would be forest snow. Runoff would be rapid over Rocky Mountain sides, much slower over low-lying river valleys For this grid box, high vegetation 'tile' covers about 75%, low vegetation 'tile' covers about 5%, lake 'tile' covers about 5%, and the remaining area about 15% is considered a bare ground 'tile'. This consists of 5% rock area but 10% urban area which is also considered as bare ground. An ENS meteogram is interpolated from the four grid points surrounding a given station within the box. See Section on Selection of grid points for Meteograms for details.

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