how to bin data

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ahmad Saad
ahmad Saad 2023-10-6
评论： ahmad Saad 2023-10-9
i have (attahed) dataset of 3 cols : (1st for lat. ,2nd for long., and the 3rd for datavalues).
i need to bin these data in a grid of lat(2.5) x long(5) degrees.
then plot the results with surf function over the coressponding map location ?
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Matt J
Matt J 2023-10-9
编辑：Matt J 2023-10-9
it seems that the two figures are not similar.
Which two figures? The figures in my 2 answers are different because they use different regridding algorithms. Both of them can be implemented using a for-loop, but how would that help you decide between them? It won't change the surfaces.
ahmad Saad
ahmad Saad 2023-10-9
@Matt J deep thanks for your explaination

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采纳的回答

Matt J
Matt J 2023-10-6
编辑：Matt J 2023-10-6
Ran in:
[lat,lon,vals]=readvars('dataset.txt');
LAT=min(lat):2.5:max(lat);
LON=min(lon):5:max(lon);
VALS=griddata(lat,lon,vals, LAT',LON);
Warning: Duplicate data points have been detected and removed - corresponding values have been averaged.
surf(LAT,LON,VALS)

更多回答（1 个）

Matt J
Matt J 2023-10-6
Ran in:
Or perhaps,
[lat,lon,vals]=readvars('dataset.txt');
LAT=min(lat):2.5:max(lat);
LON=min(lon):5:max(lon);
G=findgroups(discretize(lat,LAT), discretize(lon,LON));
VALS=splitapply(@sum,vals,G)./splitapply(@numel,vals,G);
VALS=reshape(VALS, numel(LAT)-1,[]);
LAT=conv(LAT,[1,1]/2,'valid');
LON=conv(LON,[1,1]/2,'valid');
surf(LAT,LON,VALS);

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