2D conditions at the ground/surface and the energy exchanged there.
Index Surface Grid ( )
Internal cell ID; not a measurement.
Soil Profile Type ( )
Which soil/surface material (from your database) covers that cell, e.g. asphalt, grass, water.
z Topo (m)
Ground (terrain) height of the cell above the model base.
Surface Inclination (°)
The slope of the surface at that cell (0° = flat).
Surface Exposition (°)
The compass direction the slope faces.
Shadow Flag ( )
Whether the cell is currently shaded (in shadow) or sunlit. Great for visualising shade patterns over the day.
T Surface (°C)
The temperature of the ground surface itself — often much hotter than the air on sunny paving.
T Surface Diff. (K)
Difference between this surface temperature and a reference; highlights hot/cool spots created by the design.
T Surface Change (K/h)
How fast the surface temperature is changing, per hour.
q Surface (g/kg)
The humidity right at the surface.
uv above Surface (m/s)
Wind speed just above the surface (near pedestrian-relevant height).
Sensible Heat Flux H (W/m2)
Heat leaving the surface into the air that you can feel as warmth (see Key concepts). High over hot, dry paving.
Exchange Coeff. Heat (m2/s)
How efficiently heat is exchanged between this surface and the air. Diagnostic.
Latent Heat Flux LE (W/m2)
Cooling energy carried away by evaporation from the surface (see Key concepts). High over water, wet soil and vegetation.
Soil Heat Flux G (W/m2)
Heat flowing into (or out of) the ground. Positive usually means heat being stored in the ground during the day.
Direct SW Radiation Horizontal terrain incl. (W/m2)
Direct sunlight on the surface, accounting for the slope/tilt of the terrain.
Direct SW Radiation Horizontal (W/m2)
Direct sunlight on a flat horizontal surface (ignoring slope).
Diffuse SW Radiation Horizontal (W/m2)
Scattered skylight reaching the horizontal surface.
Reflected SW Radiation Received Horizontal (W/m2)
Sunlight reflected from surroundings onto this surface.
Reflected SW Radiation (W/m2)
Sunlight this surface reflects back upward (depends on its albedo).
Lambert Factor ( )
A geometric factor for how directly the sun strikes the surface (1 = sun straight on). Diagnostic.
LW Radiation emitted (W/m2)
Heat radiation the surface gives off because of its temperature.
LW Radiation budget (W/m2)
The net longwave balance at the surface (received minus emitted); negative means the surface is losing heat to the sky.
LW Radiation Sum all Fluxes (W/m2)
The total longwave exchange at the surface, summed over all directions.
Water Flux (g/m2s)
The rate of water evaporating from the surface, per square metre.
Sky-View-Faktor ( )
Sky View Factor: the fraction of open sky visible from the surface (see Key concepts). Low in narrow streets.
Building Height (m)
Height of the building on that cell (0 where there is no building).
Surface Albedo ( )
How reflective the surface is (0 = black, 1 = perfect mirror). Lighter surfaces stay cooler in the sun.
Deposition Speed (mm/s)
How quickly airborne pollutant settles onto the surface (only with pollutants enabled).
Mass Deposed (µg/m2)
Total pollutant mass that has settled on the surface so far (only with pollutants enabled).
z node Biomet Reference ( )
The grid level used as the "person height" reference for comfort outputs. Internal reference.
z Biomet (m)
The actual height (in metres) of that comfort reference level (typically ~1.4 m, standing person).
T Air Biomet (°C)
Air temperature at person height, used for comfort.
q Air Biomet (g/kg)
Humidity at person height, used for comfort.
TMRT Biomet (°C)
Mean Radiant Temperature at person height — the key radiation input to outdoor comfort.
Wind Speed Biomet (m/s)
Wind speed at person height, used for comfort.
Mass Biomet (ug/m3)
Pollutant concentration at person/breathing height.
Receptors ( )
Marks cells where you placed a receptor for detailed time-series output.
PET* Default Person Biomet (°C) — optional
"Feels-like" PET comfort temperature at person height.
UTCI Biomet (°C) — optional
UTCI "feels-like" comfort temperature at person height.