Level type valuesΒΆ
This table lists the possible values for leveltype1 or
leveltype2 and the interpretation of the corresponding numerical
value l1 or l2. Leveltype values in the range 0-255 can
be used for defining either a single level (leveltype1) or a surface
delimiting a layer (leveltype1 and leveltype2) with any meaningful
combination of leveltypes; values of leveltype >255 have a special use
for encoding cloud values in SYNOP reports and they do not strictly
define physical surfaces.
The idea is borrowed from the GRIB edition 2 fixed surface concept and the values for leveltype coincide with the GRIB standard where possible.
Level type |
Meaning |
Unit/contents of |
|---|---|---|
0 |
Reserved |
|
1 |
Ground or Water Surface |
|
2 |
Cloud Base Level |
|
3 |
Level of Cloud Tops |
|
4 |
Level of 0C Isotherm |
|
5 |
Level of Adiabatic Condensation Lifted from the Surface |
|
6 |
Maximum Wind Level |
|
7 |
Tropopause |
|
8 |
Nominal Top of the Atmosphere |
DB-All.e encodes the channel number of polar satellites in L1 |
9 |
Sea Bottom |
|
10-19 |
Reserved |
|
20 |
Isothermal Level |
K/10 |
21-99 |
Reserved |
|
100 |
Isobaric Surface |
Pa |
101 |
Mean Sea Level |
|
102 |
Specific Altitude Above Mean Sea Level |
mm |
103 |
Specified Height Level Above Ground |
mm |
104 |
Sigma Level |
1/10000 |
105 |
Hybrid Level |
|
106 |
Depth Below Land Surface |
mm |
107 |
Isentropic (theta) Level |
K/10 |
108 |
Level at Specified Pressure Difference from Ground to Level |
Pa |
109 |
Potential Vorticity Surface |
10-9 K m2 kg-1 s-1 |
110 |
Reserved |
|
111 |
Eta (NAM) Level (see note below) |
1/10000 |
112-116 Reserved |
||
117 |
Mixed Layer Depth |
mm |
118-159 Reserved |
||
160 |
Depth Below Mean Sea Level |
mm |
161 |
Depth Below Water Surface |
mm |
162-191 Reserved |
||
200 |
Entire atmosphere (considered as a single layer) |
|
201 |
Entire ocean (considered as a single layer) |
|
204 |
Highest tropospheric freezing level |
|
206 |
Grid scale cloud bottom level |
|
207 |
Grid scale cloud top level |
|
209 |
Boundary layer cloud bottom level |
|
210 |
Boundary layer cloud top level |
|
211 |
Boundary layer cloud layer |
|
212 |
Low cloud bottom level |
|
213 |
Low cloud top level |
|
214 |
Low cloud layer |
|
215 |
Cloud ceiling |
|
220 |
Planetary Boundary Layer |
|
222 |
Middle cloud bottom level |
|
223 |
Middle cloud top level |
|
224 |
Middle cloud layer |
|
232 |
High cloud bottom level |
|
233 |
High cloud top level |
|
234 |
High cloud layer |
|
235 |
Ocean Isotherm Level |
K/10 |
240 |
Ocean Mixed Layer |
|
241 |
Ordered Sequence of Data |
|
242 |
Convective cloud bottom level |
|
243 |
Convective cloud top level |
|
244 |
Convective cloud layer |
|
245 |
Lowest level of the wet bulb zero |
|
246 |
Maximum equivalent potential temperature level |
|
247 |
Equilibrium level |
|
248 |
Shallow convective cloud bottom level |
|
249 |
Shallow convective cloud top level |
|
251 |
Deep convective cloud bottom level |
|
252 |
Deep convective cloud top level |
|
253 |
Lowest bottom level of supercooled liquid water layer |
|
254 |
Highest top level of supercooled liquid water layer |
|
256 |
Clouds |
|
257 |
Information about the station that generated the data |
|
258 |
(use when ltype1=256) Cloud Data group, L2 = 1 low clouds, 2 middle clouds, 3 high clouds, 0 others |
|
259 |
(use when ltype1=256) Individual cloud groups, L2 = group number |
|
260 |
(use when ltype1=256) Cloud drift, L2 = group number |
|
261 |
(use when ltype1=256) Cloud elevation, L2 = group number; (use when ltype1=264) L2 = swell wave group number |
|
262 |
(use when ltype1=256) Direction and elevation of clouds, L2 is ignored |
|
263 |
(use when ltype1=256) Cloud groups with bases below station level, L2 = group number |
|
264 |
Waves |
|
265 Non-physical data level |