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
AVERAGED_LAST_RESULT boolean Whether an additional timeframe is added, showing an average of the results of all preceding timeframes.
DAILY_AVG_RADIATION Wm-2 / hr The average of amount of sun radiation per hour per square meter 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.
DAILY_TEMPERATURE_MAX °C Maximum temperature measured at a weather station.
DAILY_TEMPERATURE_MIN °C Minimum temperature measured at a weather station.
DATES timestamp Dates define the amount of timeframes and are used to define the day and time for calculating sun angles.
EXCLUDE_BUILDINGS boolean Whether the results of buildings should be excluded from the final results.
EXCLUDE_WATER boolean Whether the results at the location of water should be excluded from the final results.
FOLIAGE_AREAS boolean Whether to use foliage data from Areas instead of the calculated foliage decks from functions with a foliage crown factor.
HOURLY_HUMIDITY percentage The relative humidity of the air at this hour, measured at a weather station.
HOURLY_RADIATION Wm-2 / hr The amount of Sun radiation this hour, measured at a weather station.
HOURLY_TEMPERATURE °C The temperature at this hour, measured at a weather station.
SUN_ALTITUDE angle (0-90°) The sun angle up from the horizon.
SUN_AZIMUTH geo angle (0-360°) The angle of the sun along the horizon.
SUN_DAILY_MOTION factor A factor to account for the sun moving across the sky throughout the day.
WIND_DIRECTION geo angle (0-360°) The wind direction viewed from above, with 0° corresponding to north, and increasing in a clockwise fashion.
WIND_SPEED m/s The wind speed measured at a weather station at the height of 10 meters above ground.

Notes

  • The model relies on a number of attributes which can be measured by measure stations. For any given project, it is recommended to find data from a (reference) weather station applicable to the project area, and use those values as parameters for the Heat Module calculations.
  • When the DATES attribute is configured for multiple timeframes, the Hourly, Sun, and Wind attributes should have an equal amount of entries. When using the Heat Overlay configuration wizard, the necessary entries are created automatically.

See also