Creating hourly average data with geographic coordinates to produce 3D matrix
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I have 4 column matrix, which include irregular time, temperature, latitude and longitude. I want to creat 3-D matrix such that I have hourly averages of temperature within particular latitude and longitude grid. Thereby producing a 3D matrix of latitude x longitude x hourly averaged temperature.
Please find the attached dataset.
Thanks in advance!
3 Comments
dpb
on 25 Jul 2021
Are there missing hours that would have to be interpolated/filled first (or if missing ignored)?
Accepted Answer
dpb
on 25 Jul 2021
Edited: dpb
on 25 Jul 2021
rowfun to the rescue yet again... :)
tData=readtable();
longrid=-180:10:180;
latgrid=-90:10:90;
[~,~,~,tData.lon_g,tData.lat_g]=histcounts2(tData.lon,tData.lat,longrid,latgrid);
tGroup=rowfun(@mean,tData,'InputVariables','temp', ...
'GroupingVariables',{'hour','lon_g','lat_g'}, ...
'OutputVariableNames','temp');
produces:
>> [head(tGroup,5);tail(tGroup,5)]
ans =
10×5 table
hour lon_g lat_g GroupCount temp
____ _____ _____ __________ ______
0 2 14 1 89.94
0 3 5 1 99.68
0 3 7 1 87.31
0 3 9 1 100.86
0 3 15 1 71.35
23 35 14 2 89.96
23 35 15 1 101.81
23 35 16 1 107.89
23 35 18 1 101.6
23 36 9 1 91.3
>>
6 Comments
dpb
on 26 Jul 2021
Well, that's not the Answer of the link... <VBG>
Then see
doc xcorr2
It's in Signal Processing TB
More Answers (1)
KSSV
on 25 Jul 2021
T = readtable('New Text document.txt') ;
t = T.hour ;
lon = T.lon ;
lat = T.lat ;
temp = T.temp ;
[c,ia,ib] = unique(t) ;
n = length(c) ;
iwant = cell(n,1) ;
for i = 1:n
iwant{i} = [t(ib==i) lon(ib==i) lat(ib==i) temp(ib==i)] ;
end
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