IoT Device Model and Devices Data Dictionary: updated at 03/2023

Please note that this is just an example, since new definitions are frequently updated. For any doubts please refer to the Entity/IoT Directory tool in which you can actually define the values.

Please note that: in the definition of Entity Model (IoT Device Model), you have to define for each variable (Entity Variable, values) the Value Name, Value_Type, Value_Unit and Data_Type, and for this purpose you have to use the Dictionary reported in section VII Appendix data dictionary. The Entity Directory (IoT Directory) has an on-line dictionary directly enforced into the assisted tool for defining the Entity Models (IoT Device Models). An online version of the table in appendix can be recovered from https://www.snap4city.org/818

Any update and addition to the dictionary of snap4city.org has to be requested to snap4city@disit.org.

If you have your own instance of the platform, you can define your own dictionary and request a copy of the snap4city.org dictionary by email. The dictionary is used into the IoT Device Model definition, in mapping smart data models, and in creating full custom devices.

Please note that

ValueName is the name of the variable/values,
- it does not accept any space or special char in its definition as in most of the programming languages.
- for each Value Name you have to specify Value_Type, Value_Unit and Data_Type,
- Value Name cannot be one of the strings used for Value_Type, Value_Unit and Data_Type
- see Section VII Appendix Data Dictionary.
according to the Value_Type selected the possible values for
- Value_Unit would be restricted. These constraints are directly applied in the user interface tool of the Entity Directory (IoT Directory).
- Data_Type would be restricted. These constraints are directly applied in the user interface tool of the Entity Directory (IoT Directory).
Value_Type, Value_Unit, Data_Type cannot have spaces in their name definitions.
Data_Type for Value_Unit defined as timestamps are strings. They are expected to be formatted as ISOString: YYYY-MM-DDTHH:mm:ss.sssZ which can be obtained by using function toISOString() of JavaScript on variables of kind Date()
- Please note that ISOstrings have to be in UTC to avoid misplacement of events coming in different time regions in the wrong position, and thus to reproduce wrong visualization once you change the international time fuse.
Time Durations can be in millisecons, hours, minutes, etc… and aer typically integer or float.
Each Entity Model and Entity Instance may have
- At most one ValueName defined as dateObserved, with value type = timestamp.
- At most one Value Type defined as Timestamp
- dateObserved should have Value_Type defined as Timestamp to create Time Series
- any other variable, and thus Value Name which needs to have as Value_Unit of timestamp in millisecond has to provide a Value_Type defined as Datetime which is also coded in time stamp millisecond and in ISO string.
- The absence of unique single Value_Type per model/entity defined as Timestamp would bring to create a stable Entity without time series.
- The presence of multiple Value_Type per model/entity defined as Timestamp would bring to create unpredictable behavior.
Data_Types are typically:
- integer, float (AKA numeric). Any variable on which you would like to apply math operators on queries (and thus on the corresponding Smart City API) such as <, >, <=, >=, etc. has to be defined with a Data_Type which is numeric. Integer and Float do not have limitations on their dynamics.
- String. Any variable can be also defined and loaded with strings, and you can send on strings also numbers. The only operator on strings is the verification of the equality ==. Good for status detection.
- JSON. Can be JSON data structure.
JSON Data_type have some limitations. Since if your have JSON data type:
- The loaded JSON pack will be stored as a string into the Storage
- The loaded JSON data will not be
  - singularly indexed into the storage, so that they will not be automatically usable into Time Series, and dashboards for showing values, sequences, barseries, spidernet, etc.
  - search-able by using queries and query by value of the Smart City API

Value Type	Description	Possible Value Units (separated by commas)	Possible Data Types (separated by commas)
actuator_canceller	Actuator Canceller		string
actuator_deleted	Actuator Deleted		integer
actuator_deletion_date	Actuator Deletion Date	timestamp	string
air_quality_index	Air quality index		float
altitude	Altitude	m	float,integer
angle	angle	deg	float
annual_C6H6_average	annual_C6H6_average	ppm, mg/m3, µg/m³	float
annual_C6H6_exceedance_count	annual_C6H6_exceedance_count	#	integer,float
annual_CO_average	annual_CO_average	ppm, mg/m3, µg/m³	float
annual_CO_exceedance_count	annual_CO_exceedance_count	#	integer,float
annual_NO2_average	annual_NO2_average	ppm, mg/m3, µg/m³	float
annual_NO2_exceedance_count	annual_NO2_exceedance_count	#	integer,float
annual_O3_average	annual_O3_average	ppm, mg/m3, µg/m³	float
annual_O3_exceedance_count	annual_O3_exceedance_count	#	integer,float
annual_particle_average	annual_particle_average	ppm, mg/m3, µg/m³	float
annual_particle_exceedance_count	annual_particle_exceedance_count	#	integer,float
annual_PM10_average	annual_PM10_average	ppm, mg/m3, µg/m³	float
annual_PM10_exceedance_count	Annual PM10 Exceedance Count	#	integer,float
annual_PM2_5_average	annual_PM2_5_average	ppm, mg/m3, µg/m³	float
annual_PM2_5_exceedance_count	annual_PM2_5_exceedance_count	#	integer,float
anomaly_level	anomaly level for traffic	-	string,integer,float
asleep_time	Asleep Time	min	string
audio	Audio		string,float
available_bikes	Available Bikes	#	integer
average_accelerometric_intensity	Average Accelerometric Intensity	mV, m/s2	float
average_atmospheric_pressure	Average Atmospheric Pressure	hPa, bars	float
average_brightness	Average Brightness	lux	float
average_heart_rate	Average Heart Rate	bpm	float
average_humidity	Average Humidity	kg/m³	float
average_noise	Average Noise	dB	float
average_respiratory_matrix_signal	Average Respiratory Matrix Signal	bpm	float
average_respiratory_rate	Average Respiratory Rate	bpm	float
average_temperature	Average Temperature	°C	float
average_vehicle_distance	Average Vehicle Distance	Km, m	float
average_vehicle_speed	Average Vehicle Speed	km/h, m/s	float
average_vehicle_time	Average Vehicle Time	s	string,float
battery_level	Battery Level	%	float
BC_concentration	Bc Concentration	ppb, ppm	float
benzene_concentration	Benzene Concentration	ppb, ppm, µg/m³	float
bike_count	number of bikes	K#, #	integer
blue_code_count	Blue Code Count	#	integer
brightness_flag	Brightness Flag	#	string
broken_bikes	Broken Bikes	#	integer
burning_hours	burning_hours	hours	string
button	Button	#	integer
Capacity	Volume capacity	l	float
car_park_exit_rate	Car Park Exit Rate		float
car_park_fill_rate	Car Park Fill Rate		float
car_park_free_places	Car Park Free Places	#	integer
car_park_occupancy	Car Park Occupancy	%	string,float
car_park_occupancy_time	Car Park Occupancy Time	min	string
car_park_occupied_places	Car Park Occupied Places	#	integer
car_park_status	Car Park Status	status	string
car_park_validity_status	Car Park Validity Status	status	string
car_plate	Car plate	targa	string
charging_level	Charging Level	%	float
charging_state	Charging State	status	string
charging_station_state	Charging Station State	status	string
cloud_cover	Cloud cover	-, %	float
CO2_concentration	CO2 Concentration	ppb, ppm, µg/m³	float
CO_concentration	CO Concentration	ppb, ppm, mg/m3, µg/m³	float
Count	count	H#, M#, K#, #	integer
creation_date	Creation Date	timestamp	string
current	Current	A, mA, KA	float
current_working_mode	current_working_mode		string,integer
CylinderSize	Size of a Cylinder for gas or liquid	l	float
daily_O3_exceedance_count	Daily O3 Exceedance Count	µg/m³, #	integer
dali_com_error	dali_com_error	bool	string
dali_dimming_error	dali_dimming_error	bool	string
dali_gear_error	dali_gear_error	bool	string
dali_lamp_error	dali_lamp_error	bool	string
datastructure	data structure	complex	json
DataTransferred	Transferred Data	Kbyte	float
date	Date	timestamp	string
datetime	Datetime	timestamp	string
description	Entity Description	text	string
dew_point	Dew Point	°C	float
dimension	measurable dimension	mm, cm, mt	integer,float
displacement	Displacement of a Motor	cm3, l	float
distance	Distance	Km, m	integer,float
duration	Duration	s, min, hours, day, month, year	integer,float
electro_conductivity	Electro Conductivity	mS/cm, µS/cm	float
electro_valve_action	Electro Valve Action		string
energy	Energy	KW/h, MW/H, wh	float
entity_creator	Entity Creator		string
entity_desc	Entity Desc		string
enviromental_quality_flag	Enviromental Quality Flag	#	string
fan	Fan	-	integer,float
fast_charging_status	Fast Charging Status	status	string
Flow_of_Gas_as_Metane	Flow of Gas as Metane	SMC	float
free_stalls	Free Stalls	#	integer
freeze	Freeze		string,float
fuel_price	Fuel Price	euro	float
fuel_type	Fuel Type		string
GEI	Guest Experience Index	#	float
geolocation	geolocation	text	string
glucose_percentage	Glucose Percentage	%	float
green_code_count	Green Code Count	#	integer
H2S_concentration	H2S Concentration	ppb, ppm, µg/m³	float
hailDensity	hailAmount per area	hits/cm2	float
height	height or quote	m	float
high	height		float
hour_O3_max	Hour O3 Max	µg/m³	float
humidity	Humidity	%	float
humidity_flag	Humidity Flag	#	string
Identifier	Identifier	ID, SURI	integer,string
image	image	imagebuffer	string
ir	Ir		string,float
lamp_level	Lamp Level	%	float
lamp_temperature	Lamp Temperature	°C	float
latitude	Latitude	deg	float
latitude_longitude	Latitude Longitude	latlon	string,json
leaf_wetness	Leaf Wetness	%	string
light	Light	lux	float
light_intensity	Light Intensity	lux, %	float
light_level	Light Intensity	%	float
lightpoint_status	lightpoint_status		string
likertvote	vote in likert scale	vote	integer
longitude	Longitude	deg	float
Matter_over_time	Average Respiratory Matrix Signal	t/h, t/d	string
max_temperature	Max Temperature	°C	float
message	Message		string
min_temperature	Min Temperature	°C	float
monitor_status	Monitor Status	status	string
monthly_C6H6_average	monthly_C6H6_average	ppm, mg/m3, µg/m³	float
monthly_C6H6_exceedance_count	monthly_C6H6_exceedance_count	#	integer
monthly_CO_average	monthly_CO_average	ppm, mg/m3, µg/m³	float
monthly_CO_exceedance_count	monthly_CO_exceedance_count	#	integer,float
monthly_NO2_average	monthly_NO2_average	ppm, mg/m3, µg/m³	float
monthly_NO2_exceedance_count	monthly_NO2_exceedance_count	#	integer
monthly_O3_average	monthly_O3_average	ppm, mg/m3, µg/m³	float
monthly_O3_exceedance_count	monthly_O3_exceedance_count	#	integer
monthly_particle_average	monthly_particle_average	ppm, mg/m3, µg/m³	float
monthly_particle_exceedance_count	monthly_particle_exceedance_count	#	integer,float
monthly_PM10_average	monthly_PM10_average	ppm, mg/m3, µg/m³	float
monthly_PM10_exceedance_count	monthly_PM10_exceedance_count	#	integer
monthly_PM2_5_average	monthly_PM2_5_average	ppm, mg/m3, µg/m³	float
monthly_PM2_5_exceedance_count	monthly_PM2_5_exceedance_count	#	integer
moonillumination	illumination of the moon	%	float
moonphase	Phase of the Moon	status	string
moonrise_time	Moonrise Time	HH:MM	string
moonset_time	Moonset Time	HH:MM	string
motion_detection	Motion Detection		string
name	just the name	text	string
NO2_concentration	NO2 Concentration	ppb, ppm, ug/m3, µg/m³	float
NO_concentration	NO Concentration	ppb, ppm, ug/m3, µg/m³	float
noise_flag	Noise Flag	#	string
noise_laeq	Noise LA eq	dBA	float
noise_lamax	Noise LA max	dBA	float
nonrem_time_wrt_total_bed_time	Nonrem Time Wrt Total Bed Time	%	string
nonrem_time_wrt_total_sleep_time	Nonrem Time Wrt Total Sleep Time	%	string
O3_concentration	O3 Concentration	ppb, ppm, ug/m3, µg/m³	float
orientation	Orientation		string,float
people_count	People Count	Mean#, H#, M#, K#, #	integer
people_percentage	people percentage	%	float
perc_of_presences	percentage of presences	%	float
perceived_temperature	Perceived Temperature	°C	float
percentage_variation	variation	%	float
period	period	text	integer
pH	value of pH	#	float
PM10_concentration	PM10 Concentration	ppb, ppm, ug/m3, mg/m3, µg/m³	float
PM1_Concentration	PM1 Concentration	ppm, ug/m3, mg/m3, µg/m³	float
PM2.5_concentration	PM2.5 Concentration	ppb, ppm, ug/m3, mg/m3, µg/m³	float
pollen_concentration_level	Pollen Concentration Level	ppm, mg/m3	float
pollen_concentration_trend	Pollen Concentration Trend	ppm, mg/m3	float
pollen_concentration_value	Pollen Concentration Value	ppm, mg/m3	float
position	a position	coord	float
power	Power	W, MW, KW, GW, milliwatt	float
power_meter_m	Power Meter M		float
power_meter_s	Power Meter S		float
power_state	power_state		string,float
powerfactor	powerfactor	#	float
precipitation_type	Precipitation Type		string
presence_detection_e	Presence Detection E		string
pressure	Pressure	hPa, bars	float
price	price	euro, Meuro, keuro	float
Radiatio_Flux	Watt on square meter	W/m2	float
rain	Rain	mm	float
red_code_count	Red Code Count	#	integer
rem_sleep_latency	Rem Sleep Latency	min	float
rem_time_wrt_total_bed_time	Rem Time Wrt Total Bed Time	%	string
rem_time_wrt_total_sleep_time	Rem Time Wrt Total Sleep Time	%	string
road_condition	Road Condition		string
salt_concentration	Salt Concentration	%	float
SAscore	Sentiment Analysis Score	#	float
sittings_count	Sittings Count	#	integer
sleep_efficiency	Sleep Efficiency	%	float
sleep_quality_index	Sleep Quality Index	#	float
snow	Snow	cm, mt	float
SO2_concentration	SO2 Concentration	ppb, ppm, µg/m³	float
SO_concentration	SO Concentration	ppb, ppm, µg/m³	float
soil_humidity	Soil Humidity	%	float
soil_temperature	Soil Temperature	°C	float
soil_water_potential	Soil Water Potential	cbar	float
solar_radiation	photosynthetic radiation	umol/m2	float
sound_lv	Sound Lv		string,float
speed	Speed	m/s	float
state_count	State Count	#	integer
state_time	State Time		string
status	Status	status	string,integer,float
stop	Stop		integer
sun_max_height	Sun Max Height		float
sun_max_height_hour	Sun Max Height Hour		string
sunrise_time	Sunrise Time	HH:MM	string
sunset_time	Sunset Time	HH:MM	string
temperature	Temperature	°K, °F, °C	float
temperature_flag	Temperature Flag	°K, °F, #	string
time	Time	s	string
timestamp	Timestamp	timestamp	string
TOC	TOC Density, Title of Concentration	µg/Liter	float
total_sleep_time	Total Sleep Time	min	string
traffic_congestion	the ration from road capacity in car/h and the effective flow in car/h	-	float
TransferRate	TransferRate	Kbps, KByteps	float
transits_count	Transits Count	#	integer
TRSC_concentration	TRSC, Total Reduced Sulfur Compounds, Concentration	ugS/m3, ug/m3	float
URI	URI LINK	SURI	string
URL	URL link	SURI	string
uv	Uv	UVindexUnit	string,float
variance_accelerometric_intensity	Variance Accelerometric Intensity	mV	float
variance_atmospheric_pressure	Variance Atmospheric Pressure	hPa, bars	float
variance_brightness	Variance Brightness	lux	float
variance_humidity	Variance Humidity	kg/m³	float
variance_noise	Variance Noise	dB	float
variance_respiratory_matrix_signal	Variance Respiratory Matrix Signal	bpm	float
variance_temperature	Variance Temperature		float
vdc	Vdc	V	float
vehicle_concentration	Vehicle Concentration	car/m	float
vehicle_flow	Vehicle Flow	car/h	float
vehicle_occupancy	Vehicle Occupancy	-	float
vehicle_speed_percentile	Vehicle Speed Percentile		float
vehicle_threshold_perc	Vehicle Threshold Perc	%	float
VehicleCapacity	weight capacity	t, Kg	float
VehicleRange	maxium capability of a vechicle	t, Kg	float
velocity	Velocity	m/s, km/h	float
visibility	Visibility	-, Km	integer,float
VOC	Volatile Organic Compounds	ppm	float
VOC_2	Volatile Organic Compounds	ppm	float
voc_3	Volatile Organic Compounds	ppm	float
voltage	Voltage	V, millivolt, mV	float
wake_time_after_sleep_onset	Wake Time After Sleep Onset	min	string
wake_time_wrt_total_bed_time	Wake Time Wrt Total Bed Time	%	string
waste_filling_rate	Waste Filling Rate	%	float
water_consumption	Water Consumption	l/h	float
water_film	Water Film	µm	float
water_flowing	Water Flowing		float
water_level	Water Level	m	float
weather	Weather	-	float,string
weight	weight capacity	Kg	float
white_code_count	White Code Count	#	integer
wifi_access_count	Wifi Access Count	#	integer
wind	Wind		float
wind_direction	Wind Direction	deg	float
wind_gust_speed	Wind Gust Speed	m/s	float
wind_speed	Wind Speed	m/s	float
yellow_code_count	Yellow Code Count	#	integer
µg/L	TOC, Title of Concentration	µg/Liter	float

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IoT Device Model and Devices Data Dictionary: updated at 03/2023

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