| id | field name | definition |
|---|
| 0 | starttime |
| binary time | size: 12 |
|---|
BRC start time
unit: "s since 2000-01-01"
value: float(./days) * 86400 + float(./seconds) + float(./microseconds) / 1000000
| binary record | size: 12 |
|---|
ENVISAT binary datetime
| id | field name | definition |
|---|
| 0 | days |
| binary int32 | size: 4 |
|---|
days since January 1st, 2000 (may be negative)
unit: "days since 2000-01-01"
|
|
| 1 | seconds |
| binary uint32 | size: 4 |
|---|
seconds since start of day
unit: "s"
|
|
| 2 | microseconds |
| binary uint32 | size: 4 |
|---|
microseconds since start of second
unit: "1e-6 s"
|
|
|
|
|
| 1 | overall_quality |
| binary uint8 | size: 1 |
|---|
|
Flag set to 1 in case Feature Mask of this BRC is considered to be of good quality, otherwise 0. Currently set fixed to 0 as long as algorithm is in experimental status.
|
|
| 2 | feature_mask_indices |
| binary array[dim_0, 24] |
|---|
dim_0: $num_meas_max_brc
| binary record | size: 1 |
|---|
Structure containing containing feature index for all lidar bins of each measurement of the BRC.
| id | field name | definition |
|---|
| 0 | feature_mask_index |
| binary int8 | size: 1 |
|---|
|
Index for specific height bin in specific measurement. For L2A products generated with the L2A prototype, all indices are set to -2, as the Feature Mask is not retrieved by the prototype.
Possible settings:
-3 (sub-)surface data
-2 no retrievals
-1 Fully Rayleigh attenuated
0 clear sky
1 most likely molecular
2 very likely molecular
3 more likely molecular
4 likely only molecules
5 expected low altitude aerosol (not retrieved)
6 likely clouds or aerosols
7 more likely clouds or aerosols
8 very likely clouds or aerosols
9 most likely clouds
10 Clouds present
|
|
|
|
|
|