## file name yyyy-mm-dd-ROMxxxx-seq-team.csv (e.g., 2026-06-01-ROM1234-SNIF-LSCE.csv) #if no ROMxxx or ROxxx use team-dd-siteid (e.g., lsce-01-01) #seq = type of sequence: OTM (plume standing), GPM (transect), TRACER (N2O tracer), MB (mass balance drone) or SNIF (sniffing, no quantification)
## file version vxx (e.g., v01)
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## Overview
#This dataset contains measurements of methane (CH₄) emissions collected during IM4CA Romania Campaign 2026. 
#start time:YYYY-MM-DDTHH:MM:SSZ end time:YYYY-MM-DDTHH:MM:SSZ
#Site type: #e.g., oil and gas, landfill WWTP
#Site type details: #e.g., pumpjack, gas well, refinery
#Weather: #general weather comment, Pascal stability class if 2D wind sensor used
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##Measurement Details:
#Platform:  #car or drone (specify model of drone)
#CH₄ Sensor: #instrument name and number
#CH₄ Sensor Precision: #e.g., ±0.001 ppm
#CH₄ Sensor Response time: #e.g.,<1 second
#CH₄ Sensor Measurement principle: #e.g.,Laser absorption spectroscopy
#Wind Sensor: #wind sensor name (2D or 3D, mounted on platform or stationary on tripod, height above the ground, body-frame or Earth-frame reference)
#Sampling Rate: #in Hz for each instrument (e.g., CH4 instrument, wind sensor, GPS)
#Flight Pattern: #only for drones (e.g., Vertical wall transects perpendicular to wind direction)
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##File Format
#Format: CSV (Comma-Separated Values)
#Encoding: UTF-8
#Time Format: ISO 8601 (YYYY-MM-DDTHH:MM:SSZ)
#Coordinate System: WGS84 (latitude/longitude) + altitude above sea level
#Column separation: semicolon
#Decinal places separated by: .
#Comment character: #
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## Data Processing
#This dataset has undergone the following processing steps: #example steps below
#1. Time synchronization between GPS and sensor data (±1s tolerance)
#2. Removal of invalid CH₄ readings (negative values, out-of-range)
#3. Removal of data points with missing GPS coordinates
#4. Manual quality control to remove outliers and artefacts
#5. Wind corrections (body-frame to Earth-frame)
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##Note: #to indicate if it is raw data and what further processing steps should be added, example:
#This is RAW measurement data. Users should apply their own:
#Background subtraction
#Wind corrections (body-frame to Earth-frame if needed)
#Spatial interpolation
#Flux calculations
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#Data owner and contact person:
# Name email Orchid ID
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##Dataframe format
#time;CH4_ppm;C2H6_ppb;H2O;latitude;longitude;heading_deg;u_wind;v_wind;w_wind;true_u_wind;true_v_wind;true_w_wind;meteo_comment;site_comment #if 3D wind sensor
#time;CH4_ppm;C2H6_ppb;H20;latitude;longitude;heading_deg;wind_speed_ms;wind_dir_deg;true_wind_speed_ms;true_wind_dir_deg;meteo_comment;site_comment #if 2D wind sensor
#column N2O_ppm to add if N2O tracer method was used
#columns: altitude to add for drone measurements
#accepted missing/flagged value: -999. No NaN.
#data in UTC time
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#time, YYYY-MM-DDTHH:MM:SSZ #note the letters T and Z 
#CH4_ppm; in ppm; Methane (CH4) concentration
#C2H6_ppb; in ppb; Ethane (C2H6) concentration
#H2O_ppm; in ppm; Water vapor (H2O) concentration
#N2O_ppm; in ppm; Nitrous oxide (N2O) concentration
#latitude; in degrees; Latitude (WGS84)
#longitude; in degrees; Longitude (WGS84)
#altitude; in m; Altitude above mean sea level (barometric, relative to takeoff point)
#heading; in degrees; the compass direction from one datapoint to another for the on board wind sensor correction
#u_wind; in degrees; horizontal (west-east) wind axis measured by anemometer
#v_wind; in degrees; horizontal (north-south) wind axis measured by anemometer
#w_wind; in degrees; vertical wind axis measured by anemometer
#true_u_wind; in degrees; if horizontal (west-east) wind axis measured by onboard anemometer (in platform body frame), horizontal (west-east) wind axis corrected to the Earth frame
#true_v_wind; in degrees; if horizontal (north-south) wind axis measured by onboard anemometer (in platform body frame), horizontal (west-east) wind axis corrected to the Earth frame
#true_w_wind; in degrees; if vertical wind axis measured by onboard anemometer (in platform body frame), vertical wind axis corrected to the Earth frame
#wind_speed_ms; in m/s units;  Wind speed measured by anemometer
#wind_dir_deg; in degrees; Wind direction measured by anemometer
#true_wind_speed_ms; in m/s units; if Wind speed measured by onboard anemometer (in platform body frame), wind speed corrected to the Earth frame
#true_wind_dir_deg; in degrees; if Wind direction measured by onboard anemometer (in platform body frame), wind direction corrected to the Earth frame
#meteo_comment; details about meteo conditions 
#site_comment; details about site access, topography, potential sources overlapping and other useful details for CH4 quantification
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