All raw data collected from the NoiseCapture Android App, i.e. the DATABASE-NoiseCaptureRaw, are made available under the Open Database License. Any rights in individual contents of the database are licensed under the Database Contents License.

The data provided has no legal force and serves for information purposes only. Absolutely no accuracy or completeness guarantee is implied or intended. The authors are not responsible for the direct or indirect consequences of the uses or interpretation of the information provided.

Description of files:

All geojson files are based on EPSG 4326 coordinate reference system.

*.tracks.geojson

Each feature is a measure session of time_length seconds. The geometry is the bounding box of measurements locations.

• time_ISO8601 start of measurement using ISO8601 time representation
• time_epoch start of measurement in unix timestamp format (number of milliseconds since January 1, 1970, 00:00:00 GMT). The timezone is provided by the localization of the measure, not the configuration of the smartphone.
• pk_track Database track primary key. This value may change when the zip files are updated but are unique in the same zip file. This value is linked with *.points.geojson and could be used to build a geometry representation of the path of the measures.
• track_uuid Track Universally Unique IDentifier. This unique value never change between zip updates.
• gain_calibration Signal gain in dB, provided from user using phone calibration. This signal gain is already applied to all noise levels related to this track.
• noise_level Laeq level of the track
• tags User supplied tags. Some may be deleted or added later.
• pleasantness User supplied pleasantness 0-100 (may be null)

*.points.geojson

Each feature is a measure second. The geometry is the localization of the measure.

• pk_track Database track primary key. This value may change when the zip files are updated but are unique in the same zip file. This value is linked with *.tracks.geojson and could be used to build a geometry representation of the path of the measures.
• time_ISO8601 Sound level measurement time using ISO8601 time representation
• time_epoch Sound level measurement time in unix timestamp format (number of milliseconds since January 1, 1970, 00:00:00 GMT)
• time_gps_ISO8601 GPS localization may not be obtained each second. So the provided location is attached to this "gps fix" time.
• time_gps_epoch "gps fix" time in unix timestamp format (number of milliseconds since January 1, 1970, 00:00:00 GMT)
• noise_level Noise level LAeq in dB(A) 1s
• speed GPS provided speed, not accurate.
• orientation GPS provided orientation, not accurate.
• accuracy GPS localization accuracy in meters. There is a 68% chance that the true location is within that radius of the measured point in meters.

*.areas.geojson

Post-processing of measurements, each feature is an area represented by an hexagon of 15m radius.

• cell_q Hexagon q coordinate using EPSG:3857 -- WGS84 Web Mercator
• cell_r Hexagon r coordinate using EPSG:3857 -- WGS84 Web Mercator
• la50 Median sound level dB(A)
• laeq Mean sound level dB(A)
• mean_pleasantness Mean pleasantness 0-100 (may be null)
• measure_count Number of seconds of measurements in this area (may be parts of tracks)
• first_measure_ISO_8601 Date of the first measurement using ISO8601 time representation.The timezone is provided by the localization of the measure, not the configuration of the smartphone.
• first_measure_epoch Date of the first measurement in unix timestamp format (number of milliseconds since January 1, 1970, 00:00:00 GMT)
• last_measure_ISO_8601 Date of the last measurement using ISO8601 time representation.The timezone is provided by the localization of the measure, not the configuration of the smartphone.
• last_measure_epoch Date of the last measurement in unix timestamp format (number of milliseconds since January 1, 1970, 00:00:00 GMT)
• leq_profile 72 hours laeq levels. This is the temporal evolution of the LAEQ over the 24h of a day Monday-Friday + 24h Saturday + 24h Sunday. For each 1h-period (0:00-1:00, for the 1st period...), the LA50 is evaluated from the measurements.