IRIS
Intelligent Roadway Information System
Road Weather Information Systems
Select View ➔ Weather Sensors menu item
Road Weather Information Systems, or RWIS can sense data such as precipitation rate, road surface temperature, wind speed, etc. The NTCIP and Org-815 protocols can collect RWIS data.
Settings
Sensor settings are checked once per day and stored in the settings column of
the weather_sensor table as JSONB. When the value changes, a time-stamped
record is added to the weather_sensor_settings table.
The possible settings fields are:
| Field | Description |
|---|---|
reference_elevation |
Reference elevation in meters above mean sea level |
pressure_sensor_height |
Height in meters relative to reference_elevation |
wind_sensor_height |
Height in meters relative to reference_elevation |
temperature_sensor |
Array of temperature settings objects |
↳height |
Height in meters relative to reference_elevation |
pavement_sensor |
Array of pavement settings objects |
↳location |
Sensor location description |
↳pavement_type |
Pavement type description |
↳height |
Pavement height in meters relative to reference_elevation |
↳exposure |
Rough estimate of solar energy % |
↳sensor_type |
Sensor type description |
sub_surface_sensor |
Array of sub-surface sample objects |
↳location |
Sensor location description |
↳sub_surface_type |
Sub-surface type description |
↳sensor_depth |
Depth in meters below pavement surface |
Sample Data
Sample data is collected at regular intervals equal to the polling period of the
comm link. It is stored in the sample column of the weather_sensor table
as JSONB. When a new sample is stored, a time-stamped record is added to the
weather_sensor_sample table.
Only collected data is stored in the sample column. The possible fields are:
| Field | Description |
|---|---|
atmospheric_pressure |
Atmospheric pressure in pascals |
visibility |
Visibility in meters |
visibility_situation |
Visibility situation description |
avg_wind_dir |
Two minute average wind direction † |
avg_wind_speed |
Two minute average wind speed in MPS |
spot_wind_dir |
Spot wind direction † |
spot_wind_speed |
Spot wind speed in MPS |
gust_wind_dir |
Ten minute maximum wind gust direction † |
gust_wind_speed |
Ten minute maximum wind gust speed in MPS |
temperature_sensor |
Array of temperature sample objects |
↳air_temp |
Instantaneous air temperature in ℃ |
wet_bulb_temp |
Instantaneous wet-bulb temperature in ℃ |
dew_point_temp |
Instantaneous dew point temperature in ℃ |
max_air_temp |
Maximum 24 hour air temperature in ℃ |
min_air_temp |
Minimum 24 hour air temperature in ℃ |
relative_humidity |
Relative humidity in percent |
precip_rate |
Precipitation rate in mm/hr |
precip_1_hour |
One hour accumulated precipitation in mm |
precip_3_hours |
Three hour accumulated precipitation in mm |
precip_6_hours |
Six hour accumulated precipitation in mm |
precip_12_hours |
Twelve hour accumulated precipitation in mm |
precip_24_hours |
Twenty-four hour accumulated precipitation in mm |
precip_situation |
Precipitation situation description |
pavement_sensor |
Array of pavement sample objects |
↳surface_status |
Surface status description |
↳surface_temp |
Surface temperature in ℃ |
↳pavement_temp |
Pavement temperature in ℃ |
↳sensor_error |
Sensor error description |
↳surface_water_depth |
Surface water depth in meters |
↳salinity |
Salinity in parts per 100,000 by weight |
↳surface_freeze_point |
Surface freeze point in ℃ |
↳black_ice_signal |
Black ice signal description |
sub_surface_sensor |
Array of sub-surface sample objects |
↳temp |
Sub-surface temperature in ℃ |
↳moisture |
Sub-surface moisture saturation % |
↳sensor_error |
Sensor error description |
† Wind direction in degrees clockwise from due north.