Im having a ASCAT satellite data and i need to regrid 500m resolution data to 2.225 km .

Since the satellite data are available in different resolutions and projections, all the data were resampled to 2.225-km spatial resolution and in the BYU projection for comparative analysis. please provide a code for this regridding.

Answer 1

[Keerthi Reddy]

Hi Amrutha, here is a sample code which you may use, but please, make sure to add necessary changes wherever required.

% Load the satellite data 
% Assuming you have a variable named 'satelliteData' containing the original data 
% Define the desired resolution and projection 
targetResolution = 2.225; % in kilometers 
targetProjection = 'BYU'; % replace with the desired projection name 

% Define the grid for the target resolution 
targetGridSize = 1 / targetResolution; % grid size in degrees 
targetLatitudes = -90:targetGridSize:90; 
targetLongitudes = -180:targetGridSize:180; 

% Create a meshgrid for the target grid 
[lonTarget, latTarget] = meshgrid(targetLongitudes, targetLatitudes); 

% Resample the satellite data to the target grid 
regriddedData = interp2(lonOriginal, latOriginal, satelliteData, lonTarget, latTarget, 'linear'); 

% Plot the regridded data 
imagesc(targetLongitudes, targetLatitudes, regriddedData); 
colorbar; 
title('Regridded Satellite Data'); 
xlabel('Longitude'); 
ylabel('Latitude'); 

The variables latOriginal and lonOriginal contain the original longitude and latitude values of the satellite data. Also to mention, the above code uses bilinear interpolation, you can feel free to use any kind of interpolation method that suits your data.

I hope this helps.

[amrutha anna]

as im using this codes, it is showing error as unrecognised function lonOrginial. so i modified the code as given below

% Load the satellite data

% Assuming you have a variable named 'satelliteData' containing the original data

% Define the original grid size (in meters)

originalGridSize = 500;

% Define the desired resolution and projection

targetResolution = 2.225; % in kilometers

targetProjection = 'BYU'; % replace with the desired projection name

% Define the grid for the target resolution

targetGridSize = 1 / targetResolution; % grid size in degrees

targetLatitudes = -90:targetGridSize:90;

targetLongitudes = -180:targetGridSize:180;

% Create a meshgrid for the target grid

[lonTarget, latTarget] = meshgrid(targetLongitudes, targetLatitudes);

% Define the original grid for the satellite data

originalLatitudes = -90:originalGridSize/1000:90;

originalLongitudes = -180:originalGridSize/1000:180;

[lonOriginal, latOriginal] = meshgrid(originalLongitudes, originalLatitudes);

% Resample the satellite data to the target grid

regriddedData = interp2(lonOriginal, latOriginal, satelliteData, lonTarget, latTarget, 'linear');

% Plot the regridded data

imagesc(targetLongitudes, targetLatitudes, regriddedData);

colorbar;

title('Regridded Satellite Data');

still, it is showing error as error using griddedinterpolant Sample value must be of type double or single

please provide a solution for this.