Patent ID: 11960050
Assignee: NANJING JOINT INSTITUTE FOR ATMOSPHERIC SCIENCES
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 4:
5. The fusion method of the satellite-based and ground-based lightning data according to claim 1, wherein in the step S4, obtaining the fused all lightning data set comprises following steps:
(1) dividing a target area into grid points of m rows and n columns according to the longitudes and the latitudes, and interpolating the ground-based lightning data into uniform grids according to a minimum distance method, denoted as A=(aij);
(2) eliminating the overlapped data: calculating longitude and latitude distances and time intervals between satellite-based group products and the data of the cloud-to-ground lightning return strokes and the cloud flash pulses in each of the grids, and eliminating group products smaller than the time threshold and the spatial threshold in calculation results; and
(3) superimposing the satellite-based and ground-based lightning data according to the grid points, interpolating remaining satellite-based group products into spatial grids according to the minimum distance method, denoted as B=(bij), wherein lightning data in each of the grid points, whether detected by a satellite base or captured by a ground base, are marked as the valid data as long as lightning occurs, that is, a logical operation of a union set is adopted, and fused all lightning data are recorded as C, then a number of all lightning in each of the grid points is:, C
  =
  
   
    A
    +
    B
   
   =
   
    
     [
     
      
       
        
         
          a
          
           1
           ⁢
           1
          
         
         +
         
          b
          
           1
           ⁢
           1
          
         
        
       
       
        
         
          a
          
           1
           ⁢
           2
          
         
         +
         
          b
          
           1
           ⁢
           2
          
         
        
       
       
        …
       
       
        
         
          a
          
           1
           ⁢
           n
          
         
         +
         
          b
          
           1
           ⁢
           n
          
         
        
       
      
      
       
        
         
          a
          
           2
           ⁢
           1
          
         
         +
         
          b
          
           2
           ⁢
           1
          
         
        
       
       
        
         
          a
          
           2
           ⁢
           2
          
         
         +
         
          b
          
           2
           ⁢
           2
          
         
        
       
       
        …
       
       
        
         
          a
          
           2
           ⁢
           n
          
         
         +
         
          b
          
           2
           ⁢
           n
          
         
        
       
      
      
       
        ⋯
       
       
        ⋯
       
       
        ⋯
       
       
        ⋯
       
      
      
       
        
         
          a
          
           m
           ⁢
           1
          
         
         +
         
          b
          
           m
           ⁢
           1
          
         
        
       
       
        
         
          a
          
           m
           ⁢
           2
          
         
         +
         
          b
          
           m
           ⁢
           2
          
         
        
       
       
        …
       
       
        
         
          a
          
           m
           ⁢
           n
          
         
         +
         
          b
          
           m
           ⁢
           n
          
         
        
       
      
     
     ]
    
    .