Model attributes (Heat Overlay)

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 to ignore the date-time setting for the last calculated timeframe, and show an average of the results of all preceding timeframes instead.
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
EXCLUDE_WATER	boolean
FOLIAGE_AREAS	boolean
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	°	The sun angle up from the horizon.
SUN_AZIMUTH	Geo angle	The angle along the horizon, with 0° corresponding to north, and increasing in a clockwise fashion
SUN_DAILY_MOTION	factor	A factor used in calculating the Atmospheric Temperature from the calculated Urban Heat Island value.
WIND_DIRECTION	Geo angle	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.

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Heat Module

Heat Module

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Model attributes

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

Prequels

Building elevation • Foliage height • Terrain elevation

Related

Calculation models and formulas • Feature attributes • Model attributes • Result types