Model attributes (Heat Overlay)

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The heat overlay's model calculations depend on a number of calculation-wide parameters. These parameters are available as attributes of the heat overlay and can be modified as such.

Attribute Unit Description
DATES milliseconds Dates define the amount of timeframes and are used to define the day and time for calculating sun angles.
HOURLY_RADIATION Wm-2 / hr The amount of Sun radiation this hour, measured at a weather station.
HOURLY_HUMIDITY percentage The relative humidity of the air at this hour, measured at a weather station.
SUN_DAILY_MOTION factor A factor used in calculating the Atmospheric Temperature from the calculated Urban Heat Island value.
HOURLY_TEMPERATURE °C The temperature at this hour, measured at a weather station.
WIND_SPEED m/s The wind speed measured at a weather station at the height of 10 meters above ground.
WIND_DIRECTION ° The wind direction viewed from above, with 0° corresponding to North, and increasing in a clockwise fashion.
DAILY_TEMPERATURE_MIN °C Minimum temperature measured at a weather station.
DAILY_TEMPERATURE_MAX °C Maximum temperature measured at a weather station.
DAILY_AVG_RADIATION Wm-2 / hr The average of amount of Sun radiation per hour for this day, measured at a weather station.
DAILY_AVG_WIND_SPEED m/s The daily average wind speed measured at a weather station at the height of 10 meters above ground.
SUN_ALTITUDE ° The sun angle up from the horizon.
SUN_AZIMUTH ° The angle along the horizon, with 0° corresponding to North, and increasing in a clockwise fashion.

Notes

  • The sun altitude and azimuth are calculated automatically based on the project world location and the date.
  • Some model attributes have to be based on a reference weather station.


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Model attributes
Daily average radiation • Daily average wind speed • Daily maximum temperature • Daily minimum temperature • Dates • Exclude buildings • Exclude water • Exclude foliage height m • Foliage areas • Hourly humidity • Hourly radiation • Hourly temperature • Max shadow distance • Sun altitude • Sun azimuth • Sun daily motion • Wind direction • Wind speed
Building attributes
Bowen ratio • Foliage height • Foliage crown factor • Vegetation fraction
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Building elevation • Foliage height • Terrain elevation
Related
Calculation models and formulas • Feature attributes • Model attributes • Result types


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