Getting max and min in data from 1 hour every 5 mins

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flashpode 2022-4-25

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评论： flashpode 2022-4-25

Hi, I've got a code that gets me the lat and lon of each message of an hour, gets me the distance of each point and saves the max100. Every lat lon has a time arrival, how could I do the same but instead of everyr hour(one time per file) do it every 5 or 10 mins(I have the variable time already that has the minute and second of each message, so it would be divide the code for every 5 or 10 mins)

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Voss 2022-4-25

Can you share the code you already have?

flashpode 2022-4-25

在 MATLAB Online 中打开

yeah so first thing the minut and the second of the message is in the name of the message so I extracted it the following way:

 AIS1 = importfileAIS(thisfile1);
      AIS1(strlength(AIS1) < 15) = [];
      msg_AIS1 = regexp(AIS1, '.*(?=\d{4}$)', 'match', 'once'); 
      t1 = regexp(AIS1, '\d{4}$', 'match', 'once'); % 

then I code the lat and lon and calculate all the distances of the hour

       lat1 = [];
 lon1 = [];
for i=1:1:N
    seq1 = AIS1(i);
    linia=convertStringsToChars(seq1); 
    try
        
        if linia(13)=='A' && linia(15)=='1'
          
            sequencia = ais_to_bit(linia(15:44));
            s_longitud=sequencia(62:89);
            longitud = bin2dec(num2str(s_longitud))/600000; lon1 = [lon1, longitud];
            s_latitud=sequencia(90:116);
            latitud = bin2dec(num2str(s_latitud))/600000; lat1 = [lat1, latitud];   
            pos_lat = 1:numel(lat1); value_lat = lat1(lat1>50); index1 = pos_lat(lat1>50);
            lat1(index1) = [];lon1(index1) = [];
            pos_lon = 1:numel(lon1); value_lon = lon1(lon1>3); index2 = pos_lon(lon1>3);
            lat1(index2) = []; lon1(index2) = []; 
            
        end
        
    catch ME
        
        disp(ME.message);
        continue
        
    end
    
    
end
 %%Calculamos las distancias Max #1 y #100
NumLat1 = numel(lat1);
Total_Dist=cell(1,NumLat1); 
for i = 1:1:NumLat1
    loc1 = [lat1(i),lon1(i)]; loc2 = [41.3828 2.1857];
    [~,Dist] = haversine(loc1,loc2);
    Total_Dist{i} = Dist;
end

The point is that I want to get the highest distances every 5 or 10 mins

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Getting max and min in data from 1 hour every 5 mins

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Getting max and min in data from 1 hour every 5 mins

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