libdballe
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This table lists the possible values for leveltype1 or leveltype2 and the interpretation of the corresponding numerical value l1 or l2. More...
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.
leveltype Meaning unit/contents of l1/l2 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 105 Hybrid Level 106 Depth Below Land Surface mm 107 Isentropic (theta) Level K/10 108 Level at Specified Pressure Difference Pa from Ground to Level 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 leveltype Meaning unit/contents of l1/l2 118-159 Res 160 Depth Below Sea Level mm 161-191 Res 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 leveltype Meaning unit/contents of l1/l2 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, L1 = 1 low clouds, 2 middle clouds, 3 high clouds, 0 others 259 (use when ltype1=256) Individual cloud groups, L1 = group number 260 (use when ltype1=256) Cloud drift, L1 = group number 261 (use when ltype1=256) Cloud elevation, L1 = group number; (use when ltype1=264) L2 = swell wave group number 262 (use when ltype1=256) Direction and elevation of clouds, L1 is ignored 263 (use when ltype1=256) Cloud groups with bases below station level, L1 = group number 264 Waves