libdballe  7.19
Level type values

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.

Level Type  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                            1/10000                    
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                         
118-159                                                                       
Reserved                                                                      
160         Depth Below Sea Level                  mm                         
161-191                                                                       
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