Model attributes (Heat Overlay): Difference between revisions

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The [[Heat_(Overlay)|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.
The [[Heat_(Overlay)|heat overlay's]] model calculations depend on a number of calculation-wide parameters. These parameters are available as [[attribute]]s of the heat overlay and can be modified as such.


{| class="wikitable"
{{Overlay attributes|suppresscategory=true|
! Attribute
  {{ :Daily avg radiation (Heat Overlay) }}
! Unit
  {{ :Daily avg wind speed (Heat Overlay) }}
! Description
  {{ :Daily temperature max (Heat Overlay) }}
|-
  {{ :Daily temperature min (Heat Overlay) }}
| [[Dates_(Heat_Overlay)|DATES]]
| milliseconds
| Dates define the amount of timeframes and are used to define the day and time for calculating sun angles. 
|-
| [[Hourly_radiation_(Heat_Overlay)|HOURLY_RADIATION]]
| Wm<sup>-2</sup> / hr
| The amount of Sun radiation this hour, measured at a weather station.
|-
| [[Hourly_humidity_(Heat_Overlay)|HOURLY_HUMIDITY]]
| percentage
| The relative humidity of the air at this hour, measured at a weather station.
|-
| [[Sun_daily_motion_(Heat_Overlay)|SUN_DAILY_MOTION]]
| factor
| A factor used in calculating the Atmospheric Temperature from the calculated Urban Heat Island value.
|-
| [[Hourly temperature (Heat Overlay)|HOURLY_TEMPERATURE]]
| °C
| The temperature at this hour, measured at a weather station.
|-
| [[Wind speed (Heat Overlay)|WIND_SPEED]]
| m/s
| The wind speed measured at a weather station at the height of 10 meters above ground.
|-
| [[Wind direction (Heat Overlay)|WIND_DIRECTION]]
| °
| The wind direction viewed from above, with 0° corresponding to North, and increasing in a clockwise fashion.
|-
| [[Daily temperature min (Heat Overlay)|DAILY_TEMPERATURE_MIN]]
| °C
| Minimum temperature measured at a weather station.
|-
| [[Daily temperature max (Heat Overlay)|DAILY_TEMPERATURE_MAX]]
| °C
| Maximum temperature measured at a weather station.
|-
| [[Daily avg radiation (Heat Overlay)|DAILY_AVG_RADIATION]]
| Wm<sup>-2</sup> / hr
| The average of amount of Sun radiation per hour for this day, measured at a weather station.
|-
| [[ Daily avg wind speed (Heat Overlay)|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_(Heat_Overlay)|SUN_ALTITUDE]]
| °
| The sun angle up from the horizon.
|-
| [[ Sun_azimuth_(Heat_Overlay)|SUN_AZIMUTH]]
| °
| The angle along the horizon, with 0° corresponding to North, and increasing in a clockwise fashion.
|}


==Notes==
  {{ :Dates (Heat Overlay) }}
* The [[Sun_altitude_(Heat_Overlay)|sun altitude]] and [[Sun_azimuth_(Heat_Overlay)|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.


==How to's==
  {{ :Exclude buildings (Heat Overlay) }}
* [[Tutorial_dutch_model_attributes_(Heat_Overlay)|Tutorial on how to use Dutch weather data values for the Heat Stress Overlay]]
  {{ :Exclude water (Heat Overlay) }}
  {{ :Exclude foliage height m (Heat Overlay) }}
  {{ :Foliage areas (Heat Overlay) }}


{{Template:HeatOverlay_model_attribute_nav}}
  {{ :Hourly humidity (Heat Overlay) }}
  {{ :Hourly radiation (Heat Overlay) }}
  {{ :Hourly temperature (Heat Overlay) }}
 
  {{ :Max shadow distance (Heat Overlay) }}
 
  {{ :Sun altitude (Heat Overlay) }}
  {{ :Sun azimuth (Heat Overlay) }}
  {{ :Sun daily motion (Heat Overlay) }}
 
  {{ :Wind direction (Heat Overlay) }}
  {{ :Wind speed (Heat Overlay) }}
  {{ :Wind decline angle (Heat Overlay) }}
}}
 
{{article end
|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 (Heat Overlay)|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.
|seealso=
* [[Weather station (Heat Overlay)]]
}}
 
{{HeatOverlay model attribute nav}}

Latest revision as of 11:37, 8 November 2024

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.


Icon Attribute Unit Range Description Default value
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. 340
DAILY_AVG_WIND_SPEED m/s The daily average wind speed measured at a weather station at the height of 10 meters above ground. 3
DAILY_TEMPERATURE_MAX °C Maximum temperature measured at a weather station. 34
DAILY_TEMPERATURE_MIN °C Minimum temperature measured at a weather station. 19
DATES time in milliseconds Dates define the amount of timeframes and are used to define the day and time for calculating sun angles. 1375444800000
EXCLUDE_BUILDINGS boolean Whether the results of buildings should be excluded from the avg sky-view and PET results. 1
EXCLUDE_WATER boolean Whether the results at the location of water should be excluded from the avg sky-view and PET results. 1
EXCLUDE_FOLIAGE_HEIGHT_M m Whether the area directly below foliage (e.g. Trees higher then this value) should be excluded in calculating the average sky view. 1.2
FOLIAGE_AREAS boolean Whether to use foliage data from Areas instead of the calculated foliage decks from functions with a foliage crown factor. 0
HOURLY_HUMIDITY percentage The relative humidity of the air at this hour, measured at a weather station. 60
HOURLY_RADIATION Wm-2 / hr The amount of Sun radiation this hour, measured at a weather station. 700
HOURLY_TEMPERATURE °C The temperature at this hour, measured at a weather station. 33
MAX_SHADOW_DISTANCE m The maximum length of a shadow. 500
SUN_ALTITUDE angle (0-90°) The sun angle up from the horizon. 49.71
SUN_AZIMUTH geo angle (0-360°) -1.7976931348623157E308 to 1.7976931348623157E308 The angle of the sun along the horizon. 140.03
SUN_DAILY_MOTION factor A factor to account for the sun moving across the sky throughout the day. 0.11
WIND_DIRECTION geo angle (0-360°) -1.7976931348623157E308 to 1.7976931348623157E308 The wind direction viewed from above, with 0° corresponding to north, and increasing in a clockwise fashion. 0
WIND_SPEED m/s The wind speed measured at a weather station at the height of 10 meters above ground. 3
WIND_DECLINE_ANGLE Degrees This angle determines how the wind flows down around objects. 90

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

Heat Module
Benchmarks button.png
Heat introduction button.png
Heat Module
Benchmarks button.png
Getting started button.png
Tutorials
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Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
Benchmarks button.png
Benchmarks
Group
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 • Wind decline angle
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


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