The following tables list the DA10 netCDF dimensions and variables in the attenuated backscatter (ABS) files. For the full list of attributes, types, and dimensions associated with each variable, see the example file in the appendix.
The dimensions and variables are listed in alphabetical order. The order in output files depends on the software used. |
Dimension | Description |
---|---|
layer 1 | Vector that gives the number of the observed cloud layer, ordered from lowest to highest with length 5. |
module | Vector for the 2 measurement units ordered from the near-range measurement unit to the far-range measurement unit, with length 2. |
range |
Range grid vector with a resolution of 4.8 m (15 ft 9 in) and a length of 3741. Starts at 48 m (157 feet) and ends at 18 000 m (59 000 ft). |
time | Temporal grid of the measurements, length unlimited. |
Variable | Attribute | Value/Description |
---|---|---|
airplane_filter_max_range 2 | airplane_filter_max_range:units |
m, ft |
airplane_filter_max_range:long_name |
Airplane filter max. range. |
|
airplane_filter_max_range:comment |
Maximum range where airplane echoes are filtered to prevent false cloud detection. |
|
azimuth_angle 2 | azimuth_angle:units |
Degrees |
azimuth_angle:long_name |
Measurement azimuth angle |
|
azimuth_angle:standard_name | sensor_azimuth_angle | |
azimuth_angle:comment |
Azimuth direction of tilted beam for each optics unit, clockwise positive from north. |
|
beta_att |
beta_att:units |
1/(m*sr) |
beta_att:long_name |
Attenuated volume backscatter coefficient |
|
beta_att:coordinates | Time range longitude latitude | |
beta_att:averaging_time_in_seconds | 5 | |
beta_att_noise_level 2 | beta_att_noise_level:long_name |
Noise level of the attenuated volume backscatter coefficient. |
beta_att_noise_level:comment | Unitless number describing the noise level. | |
beta_att_sum 2 | beta_att_sum:units |
1/(10^4*sr) |
beta_att_sum:long_name |
Scaled integral of the attenuated volume backscatter coefficient |
|
cloud_base_heights 2 | cloud_base_heights:units |
m, ft |
cloud_base_heights:long_name |
Heights (range) of the detected cloud bases |
|
cloud_base_heights:coordinates | Time layer longitude latitude | |
cloud_base_heights:comment | Reported in vertical, or in the instrument beam direction, depending on tilt_correction setting | |
cloud_calibration_factor 2 | cloud_calibration_factor:long_name |
Factory cloud calibration value. |
cloud_calibration_factor:comment |
Instrument-specific
|
|
cloud_calibration_factor_user 2 | cloud_calibration_factor_user:long_name |
User set cloud calibration value. |
cloud_calibration_factor_user:comment |
Instrument-specific
|
|
cloud_penetration_depth2 | cloud_penetration_depth:units |
m, ft |
cloud_penetration_depth:long_name |
Cloud penetration depth in the direction of the instrument beam |
|
cloud_penetration_depth:coordinates | Time layer longitude latitude | |
cloud_penetration_depth:comment | Reported in the instrument beam direction | |
cloud_thickness2 | cloud_thickness:units |
m, ft |
cloud_thickness:long_name |
Cloud thickness in the direction of the instrument beam |
|
cloud_thickness:coordinates | Time layer longitude latitude | |
cloud_thickness:comment | Reported in the instrument beam direction | |
elevation |
elevation:units |
m Always in meters |
elevation:long_name |
Ground-level altitude |
|
elevation:standard_name | ground_level_altitude | |
elevation:comment |
Measurement site height above or below a fixed reference point, most commonly mean sea level |
|
fog_detection 2 | fog_detection:long_name |
Detection of fog |
fog_detection:coordinates | Time longitude latitude | |
fog_detection:comment |
|
|
height_offset |
height_offset:units |
m Always in meters |
height_offset:positive | Up | |
height_offset:long_name |
Instrument height offset to ground level. |
|
height_offset:comment |
Instrument height offset relative to ground level, for example, when the instrument is placed on a roof of a building or below the ground level; the offset is added to the cloud base height results |
|
latitude |
latitude:units |
Degrees north |
latitude:long_name |
Latitude |
|
latitude:standard_name | latitude | |
layer 2 | layer:units |
Layer |
layer:long_name |
Cloud layer |
|
layer:comment | 1 ... 5: observed cloud layer or cloud base | |
longitude |
longitude:units |
Degrees east |
longitude:long_name |
Longitude |
|
longitude:standard_name | longitude | |
merging_region |
merging_region:units |
m, ft |
merging_region:long_name |
Merging region from near range to far range. |
|
merging_region:comment |
Region where transition from near-range measurement to far-range measurement occurs. |
|
module |
module:long_name |
Measurement unit |
module:comment |
|
|
overlap_function 2 | overlap_function:long_name |
Instrument-specific overlap function. |
overlap_function:comment |
The part of the transmitted power that hits the receiver detector, as a function of distance, normalized to be unity at the distance of the best focus. |
|
precipitation_detection 2 | precipitation_detection:long_name |
Detection of ground reaching precipitation |
precipitation_detection:coordinates | Time longitude latitude | |
precipitation_detection:comment |
|
|
range |
range:units |
m, ft |
range:long_name |
Measurement range |
|
range:axis | Z | |
range:positive | Up | |
range:comment | Measurement distance from the instrument in the direction of the transmitted laser beam | |
range_resolution |
range_resolution:units |
m, ft |
range_resolution:long_name |
Range resolution. |
|
range_resolution:comment |
Distance between consecutive profile elements in the direction of the transmitted laser beam. |
|
receiver_gain | receiver_gain:long_name |
Receiver gain status |
receiver_gain:comment |
Value 1 corresponds to nominal gain |
|
sky_condition_cloud_layer_covers2 | sky_condition_cloud_layer_covers:units |
Oktas |
sky_condition_cloud_layer_covers:long_name |
Cloud cover per cloud layer |
|
sky_condition_cloud_layer_covers:coordinates | Time layer longitude latitude | |
sky_condition_cloud_layer_covers:averaging_time_in_seconds | 1800 | |
sky_condition_cloud_layer_covers:comment |
Amount of cloud cover for different cloud layers for up to 5 layers |
|
sky_condition_cloud_layer_heights2 | sky_condition_cloud_layer_heights:units |
m, ft |
sky_condition_cloud_layer_heights:long_name |
Cloud layer heights |
|
sky_condition_cloud_layer_heights:coordinates | Time layer longitude latitude | |
sky_condition_cloud_layer_heights:averaging_time_in_seconds | 1800 | |
sky_condition_cloud_layer_heights:comment |
Heights for different cloud layers for up to 5 layers, reported in vertical, or in the instrument beam direction, depending on tilt_correction setting |
|
sky_condition_total_cloud_cover2 | sky_condition_total_cloud_cover:units |
Oktas |
sky_condition_total_cloud_cover:long_name |
Total cloud cover |
|
sky_condition_total_cloud_cover:comment |
Total amount of cloud cover aggregated across cloud layers. |
|
sky_condition_total_cloud_cover:coordinates | Time longitude latitude | |
sky_condition_total_cloud_cover:averaging_time_in_seconds | 1800 | |
tilt_angle 2 | tilt_angle:units |
Degrees |
tilt_angle:long_name |
Optics unit tilt angle from the vertical |
|
tilt_angle:standard_name | zenith_angle | |
tilt_correction 2 | tilt_correction:long_name |
Tilt correction |
tilt_correction:comment |
When correction is on, cloud bases are reported in vertical direction; when correction is off, in beam direction.
|
|
time |
time:units |
Seconds since 1970-01-01 00:00:00.000 |
time:long_name |
UTC time |
|
time:axis | T | |
time:standard_name | time | |
time:cf_role | profile_id | |
time:comment |
End of the averaging period |
|
vertical_visibility2 | vertical_visibility:units |
m, ft |
vertical_visibility:long_name |
Vertical visibility |
|
vertical_visibility:coordinates | Time longitude latitude | |
vertical_visibility:comment | Reported in the instrument beam direction |
Variable | Attribute | Description |
---|---|---|
laser_power_percent | laser_power_percent:units |
Percent Point measurement of the laser output power, with a PIN photodiode at CLL board. |
laser_power_percent:comment | Laser output power relative to the laser power measured at factory. | |
laser_power_percent:long_name | Laser power percent | |
time | time:units |
Seconds since 1970-01-01 00:00:00.000 The timestamp of the monitoring values. Common reporting frequency with profiles. |
time:long_name | Time | |
time:axis | T | |
time:standard_time | time | |
window_condition | window_condition:units | Percent |
window_condition:long_name | Window condition (near-range measurement unit) | |
window_condition:comment |
0–100 %
|