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grib文件的leveltype的含义
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TYPE AND VALUE OF LEVEL
(PDS Octets 10, 11, & 12)
Revised 05/11/2009
Red text depicts changes made since 06/25/2007
ON388 - TABLE 3a
SPECIAL LEVELS
(PDS Octet 10)
Office Note 388 - GRIB
摘录于此，方便后续学习。
ON388 - TABLE 3TYPE AND VALUE OF LEVEL
(PDS Octets 10, 11, & 12)
Revised 05/11/2009
Red text depicts changes made since 06/25/2007
| VALUE (Octet 10) |
MEANING | CONTENTS (Octets 11 & 12) |
ABBREV | |
|---|---|---|---|---|
| 0-99 | special codes, See Table 3a | 0 | 0 | - |
| 100 | isobaric level |
pressure in hectoPascals (hPa) (2 octets) |
ISBL | |
| 101 | layer between two isobaric levels | pressure of top (kPa) | pressure of bottom (kPa) | ISBY |
| 102 | mean sea level | 0 | 0 | MSL |
| 103 | Specified altitude above MSL | altitude in meters | GPML | |
| 104 | layer between two specified altitudes above MSL |
altitude of top (hm) |
altitude of bottom (hm) |
GPMY |
| 105 | specified height level above ground |
height in meters (2 octets) |
HTGL | |
| 106 | layer between two specified height levels above ground |
height of top (hm) |
height of bottom (hm) |
HTGY |
| 107 | sigma level |
sigma value in 1/10000 (2 octets) |
SIGL | |
| 108 | layer between two sigma levels | sigma value at top in 1/100 | sigma value at bottom in 1/100 | SIGY |
| 109 | Hybrid level |
level number (2 octets) |
HYBL | |
| 110 | layer between two hybrid levels | level number at top | level number at bottom | HYBY |
| 111 | depth below land surface |
centimeters (2 octets) |
DBLL | |
| 112 | layer between two depths below land surface | depth of upper surface (cm) | depth of lower surface (cm) | DBLY |
| 113 | isentropic (theta) level |
Potential Temperature (K) (2 octets) |
THEL | |
| 114 | layer between two isentropic levels | 475 K minus theta of top in K | 475 K minus theta of bottom in K | THEY |
| 115 | level at specified pressure difference from ground to level |
Pressure difference in hPa (2 octets) |
SPDL | |
| 116 | layer between two levels at specified pressure difference from ground to level | pressure difference from ground to top level in hPa | pressure difference from ground to bottom level in hPa | SPDY |
| 117 | potential vorticity(pv) surface |
pv value in units of 10-9Km2/kgs (2 octets) |
PVL | |
| 119 | NAM level |
NAM value in 1/10000 (2 octets) |
NAML | |
| 120 | layer between two NAM levels | NAM value at top of layer in 1/100 | NAM value at bottom of layer in 1/100 | NAMY |
| 121 | layer between two isobaric surfaces (high precision) | 1100 hPa minus pressure of top, in hPa | 1100 hPa minus pressure of bottom, in hPa | IBYH |
| 125 | specified height level above ground (high precision) |
Height in centimeters (2 octets) |
HGLH | |
| 126 | isobaric level |
pressure in Pascals (Pa) (2 octets) |
ISBP | |
| 128 | layer between two sigma levels (high precision) | 1.1 minus sigma of top, in 1/1000 of sigma | 1.1 minus sigma of bottom, in 1/1000 of sigma | SGYH |
| 141 | layer between two isobaric surfaces (mixed precision) | pressure of top, in hPa | 1100hPa minus pressure of bottom, in hPa | IBYM |
| 160 | depth below sea level |
Depth in meters (2 octets) |
DBSL | |
| 200 | entire atmosphere (considered as a single layer) |
0 (2 octets) |
EATM | |
| 201 | entire ocean (considered as a single layer) |
0 (2 octets) |
EOCN | |
| Note: | The numbering allows for additions within this framework: |
| 100-119 normal precision 120-139 high precision 140-159 mixed precision |
ON388 - TABLE 3a
SPECIAL LEVELS
(PDS Octet 10)
| VALUE | LEVEL | ABBREV |
|---|---|---|
| 00 | Reserved | - |
| 01 | Ground or water surface | SFC |
| 02 | Cloud base level | CBL |
| 03 | Cloud top level | CTL |
| 04 | Level of 0 deg (C) isotherm | 0DEG |
| 05 | Level of adiabatic condensation lifted from the surface |
ADCL |
| 06 | Maximum wind level | MWSL |
| 07 | Tropopause | TRO |
| 08 | Nominal top of atmosphere | NTAT |
| 09 | Sea bottom | SEAB |
| 10-19 | reserved | - |
| 20 | Isothermal level (temperature in 1/100 K in octets 11 and 12) |
TMPL |
| 21-99 | reserved | - |
| NCEP Special Levels & Layers: | ||
| 204 | Highest tropospheric freezing level | HTFL |
| 206 | Grid scale cloud bottom level | GCBL |
| 207 | Grid scale cloud top level | GCTL |
| 209 | Boundary layer cloud bottom level | BCBL |
| 210 | Boundary layer cloud top level | BCTL |
| 211 | Boundary layer cloud layer | BCY |
| 212 | Low cloud bottom level | LCBL |
| 213 | Low cloud top level | LCTL |
| 214 | Low cloud layer | LCY |
| 215 |
Cloud ceiling |
CEIL |
| 216 | Cumulonimbus Base (m) | CBB |
| 217 | Cumulonimbus Top (m) | CBT |
| 220 |
Planetary Boundary Layer (derived from Richardson number) | PBLRI |
| 222 | Middle cloud bottom level | MCBL |
| 223 | Middle cloud top level | MCTL |
| 224 | Middle cloud layer | MCY |
| 232 | High cloud bottom level | HCBL |
| 233 | High cloud top level | HCTL |
| 234 | High cloud layer | HCY |
| 235 |
Ocean Isotherm Level (1/10 deg C) | OITL |
| 236 |
Layer between two depths
below ocean surface depth of upper surface (dam) (octet 11)
depth of lower surface (dam) (octet 12)
|
OLYR |
| 237 |
Bottom of Ocean Mixed Layer (m) | OBML |
| 238 |
Bottom of Ocean Isothermal Layer (m) | OBIL |
| 239 |
Layer Ocean Surface and 26C Ocean Isothermal Level | S26CY |
| 240 | Ocean Mixed Layer | OMXL |
| 241 | Ordered Sequence of Data | OSEQD |
| 242 | Convective cloud bottom level | CCBL |
| 243 | Convective cloud top level | CCTL |
| 244 | Convective cloud layer | CCY |
| 245 |
Lowest level of the wet bulb
zero |
LLTW |
| 246 | Maximum equivalent potential temperature level | MTHE |
| 247 | Equilibrium level | EHLT |
| 248 | Shallow convective cloud bottom level | SCBL |
| 249 | Shallow convective cloud top level | SCTL |
| 251 | Deep convective cloud bottom level | DCBL |
| 252 | Deep convective cloud top level | DCTL |
| 253 |
Lowest bottom level of supercooled liquid water layer | LBLSW |
| 254 |
Highest top level of supercooled liquid water layer | HTLSW |
Office Note 388 - GRIB
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