How to extract satellite measured chlorophyll-a (chl-a) in MATLAB
I was using thie following script to extract chlor_a variable with lat[0S 30N] and lon[30W 100E] further need to capture the data values of chla for particular region esp for North Indian Ocean lat, long range ncdisp = ('A20150012015008.L3m_8D_CHL_chlor_a_4km.nc'); lat = ncread('A20150012015008.L3m_8D_CHL_chlor_a_4km.nc','lat'); lon = ncread('A20150012015008.L3m_8D_CHL_chlor_a_4km.nc','lon'); chlor_a = ncread('A20150012015008.L3m_8D_CHL_chlor_a_4km.nc','chlor_a'); % Load longitude array: lon = double(ncread('A20150012015008.L3m_8D_CHL_chlor_a_4km.nc','lon')); ind1 = find(lon>=30 & lon<=100); % Do the same for lat: lat = double(ncread('A20150012015008.L3m_8D_CHL_chlor_a_4km.nc','lat')); ind2 = find(lat>=0 & lat<=30); % Clip lat and lon to their specified range: lat = lat(ind2); lon = lon(ind1); % Make a grid: [Lat,Lon] = meshgrid(lat,lon);
John Williams answered .
2025-11-20
[X,Y] = meshgrid(lon,lat) ; xi = linspace(30,100) ; yi = linspace(0,30) ; [Xi,Yi] = meshgrid(xi,yi) ; iwant = interp2(X,Y,chlor_a',Xi,Yi) ;