IRIS
Intelligent Roadway Information System
Weather Sensors
Weather sensors can collect data such as precipitation rate, road surface temperature, wind speed, etc. The NTCIP and Org-815 protocols can collect this data.
API Resources 🕵️
iris/rwis(see below)iris/api/weather_sensor(primary)iris/api/weather_sensor/{name}
| Access | Primary | Secondary |
|---|---|---|
| 👁️ View | name, location | geo_loc, settings, sample, sample_time |
| 👉 Operate | device_request † | |
| 💡 Manage | site_id, alt_id | |
| 🔧 Configure | controller, notes | pin |
† Write only
Public JSON Data
The iris/rwis endpoint produces a JSON document containing an array of all
weather sensor objects.
| Key | Value |
|---|---|
name |
Weather sensor name |
location |
Location description |
lat |
Latitude of sensor |
lon |
Longitude of sensor |
settings |
Settings object |
sample |
Observation sample object |
sample_time |
Time stamp of observation |
Settings
This object contains sensor settings and configuration.
| Key | Value |
|---|---|
reference_elevation |
Reference elevation above mean sea level (meters) |
pressure_sensor_height |
Height relative to reference_elevation (meters) |
wind_sensor |
Array of wind sensor settings objects |
↳height |
Height relative to reference_elevation (meters) |
temperature_sensor |
Array of temperature sensor settings objects |
↳height |
Height relative to reference_elevation (meters) |
pavement_sensor |
Array of pavement sensor settings objects |
↳location |
Sensor location description |
↳pavement_type |
Pavement type description |
↳height |
Pavement height relative to reference_elevation (meters) |
↳exposure |
Rough estimate of solar energy (percent) |
↳sensor_type |
Sensor type description |
sub_surface_sensor |
Array of sub-surface settings objects |
↳location |
Sensor location description |
↳sub_surface_type |
Sub-surface type description |
↳depth |
Depth below pavement surface (meters) |
Sample
This object contains all collected observation data from the most recent polling
period. The wind_sensor, temperature_sensor, pavement_sensor and
sub_surface_sensor arrays match the order from the settings object.
| Key | Value |
|---|---|
atmospheric_pressure |
Atmospheric pressure (pascals) |
visibility |
Visibility (meters) |
visibility_situation |
Visibility situation description |
wind_sensor |
Array of wind sensor observations |
↳avg_speed |
Two minute average wind speed (m/s) |
↳avg_direction |
Two minute average wind direction † |
↳spot_speed |
Spot wind speed (m/s) |
↳spot_direction |
Spot wind direction † |
↳gust_speed |
Ten minute maximum wind gust speed (m/s) |
↳gust_direction |
Ten minute maximum wind gust direction † |
↳situation |
Wind situation description |
temperature_sensor |
Array of temperature sensor observations |
↳air_temp |
Instantaneous air temperature (℃) |
wet_bulb_temp |
Instantaneous wet-bulb temperature (℃) |
dew_point_temp |
Instantaneous dew point temperature (℃) |
max_air_temp |
Maximum 24 hour air temperature (℃) |
min_air_temp |
Minimum 24 hour air temperature (℃) |
relative_humidity |
Relative humidity (percent) |
precip_rate |
Precipitation rate (mm/hr) |
precip_1_hour |
One hour accumulated precipitation (mm) |
precip_3_hours |
Three hour accumulated precipitation (mm) |
precip_6_hours |
Six hour accumulated precipitation (mm) |
precip_12_hours |
Twelve hour accumulated precipitation (mm) |
precip_24_hours |
Twenty-four hour accumulated precipitation (mm) |
precip_situation |
Precipitation situation description |
pavement_sensor |
Array of pavement sensor observations |
↳surface_status |
Surface status description |
↳surface_temp |
Surface temperature (℃) |
↳pavement_temp |
Pavement temperature (℃) |
↳sensor_error |
Sensor error description |
↳ice_or_water_depth |
Surface ice or water depth (meters) |
↳salinity |
Salinity (ppm by weight) |
↳freeze_point |
Surface freeze point (℃) |
↳black_ice_signal |
Black ice signal description |
↳friction |
Coefficient of friction (percent) |
sub_surface_sensor |
Array of sub-surface observations |
↳temp |
Sub-surface temperature (℃) |
↳moisture |
Sub-surface moisture saturation (percent) |
↳sensor_error |
Sensor error description |
total_sun |
Sun during previous day (minutes; 0-1440) |
cloud_situation |
Cloud situation description |
solar_radiation |
Solar radiation (joules / m²) deprecated |
instantaneous_terrestrial_radiation |
Terrestrial radiation (watts / m²) |
instantaneous_solar_radiation |
Solar radiation (watts / m²) |
total_radiation |
Total from collection period (watts / m²) |
total_radiation_period |
Total radiation period (seconds) |
† Wind direction in degrees clockwise from due north.