| 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 | height_bin_index |
| binary uint8 | size: 1 |
|---|
|
Index of the height level of the group in Rayleigh scale
|
|
| 2 | aladin_cloud_flag |
| binary record | size: 1 |
|---|
| id | field name | definition |
|---|
| 0 | padding |
hidden: true
|
| 1 | clrh |
| binary uint8 | size: 0:1 |
|---|
|
1 if the relative humidity is greater than a given threshold. 0 else
|
|
| 2 | clsr |
| binary uint8 | size: 0:1 |
|---|
|
1 if the scattering ratio in the bin is greater than a given threshold above which a cloud is assumed. 0 else
|
|
| 3 | downclber |
| binary uint8 | size: 0:1 |
|---|
|
1 if the BER of the lower middle bin is lesser than the threshold. 0 else
|
|
| 4 | topclber |
| binary uint8 | size: 0:1 |
|---|
|
1 if the BER of the upper middle bin is lesser than a given threshold under which a cloud is assumed. 0 else
|
|
|
|
| 3 | nwp_cloud_flag |
| binary uint8 | size: 1 |
|---|
|
Flag testifying for various pieces of information about the cloud composition inferred from NWP data. ClContent is based on clwc & ciwc analysis and ClTp on the temperature analysis, in case the lidar detects a cloud unforeseen by the model.
- ClContent: 0 if no cloud is forecasted; 1 if there is only a liquid phase; 2 if there is a mixed liquid+solid phase (i.e. clwc and ciwc are, each taken separately, >0 in at least one region of the group); 3 if there is only a solid phase.
- ClTp: 1 if there is only a liquid phase (T>273.15K); 2 if there is a probability of a mixed liquid+solid phase (233.15K<T<273.15K); 3 if there is only a solid phase (T<273.15K).
It is built as: ClTp + 3*ClContent.
1: no cloud forecasted but if one is detected, it will be in liquid phase.
2: no cloud forecasted but if one is detected, it may be in mixed phase.
3: no cloud forecasted but if one is detected, it will be in solid phase.
4: liquid cloud forecasted.
5: liquid cloud forecasted but if one is detected, it may be in mixed phase.
6: liquid cloud forecasted but if one is detected, it may be in solid phase (very unlikely).
7: mixed phase cloud forecasted but if one is detected, it will be in liquid phase (very unlikely).
8: mixed phase cloud forecasted.
9: mixed phase cloud forecasted but if one is detected, it will be in solid phase(very unlikely).
10: solid phase cloud forecasted but if one is detected, it will be in liquid phase (very unlikely).
11: solid phase cloud forecasted but if one is detected, it may be in mixed phase.
12: solid cloud forecasted.
|
|
| 4 | l2a_group_class_reliability |
| binary double | size: 8 |
|---|
|
Coefficient characterising the reliability of the classification
|
|
| 5 | spare |
hidden: true
|