Error in making gif file from a netcdf file

Question

Shankhaneel Basak 2021-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/805686-error-in-making-gif-file-from-a-netcdf-file

评论： Shankhaneel Basak 2021-5-25

Lombok_roms_his.zip

Hello people !

I am fairly new to MATLAB and am trying to make an animation in gif format from an output netcdf file from my oceanic simulation. I face the error which I am pretty sure is dumb as the message is crystal clear in the command window. It says that :

">> animation_velocity

Error using surf (line 71)

Data dimensions must agree.

Error in animation_velocity (line 13)

surf(lon,lat,u_vel(:,:,:,i)) "

My net cdf file has the variable i want to plot has following details:

u

Size: 99x50x15x273

Dimensions: xi_u,eta_u,s_rho,ocean_time

Datatype: single

Attributes:

long_name = 'u-momentum component'

units = 'meter second-1'

time = 'ocean_time'

grid = 'grid'

location = 'edge1'

coordinates = 'lon_u lat_u s_rho ocean_time'

ocean_time

Size: 273x1

Dimensions: ocean_time

Datatype: double

Attributes:

long_name = 'time since initialization'

units = 'seconds since 2000-01-01 00:00:00'

latitude: Size: 100x50, Dimensions: xi_rho,eta_rho ; longitude: Size: 100x50 , Dimensions: xi_rho,eta_rho

I am using the following matlab script taking notes from the post https://in.mathworks.com/matlabcentral/answers/354954-how-to-make-animation-from-netcdf-file#answer_280209 which is something like this :

file = 'Lombok_roms_his.nc';
latitude = ncread(file,'lat_rho');
longitude = ncread(file,'lon_rho');
mask = ncread(file,'mask_rho');
time = ncread(file,'ocean_time');
u_vel = ncread(file,'u');
lat = double(latitude);
lon = double(longitude);
msk = double(mask);
filename = 'u_vel.gif';
for i = 1:length(time)
    surf(lon,lat,u_vel(:,:,:,i))
    shading interp 
    view(2)
    drawnow
    % Capture the plot as an image
    frame = getframe(gcf);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    % Write to the GIF File
    if i == 1
        imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append');
    end
end

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Chad Greene 2021-4-19

在 MATLAB Online 中打开

Is your variable u the same as your variable u_vel? If so, its dimensions are 99x50x15x273, whereas lat and lon are 100x50. The first step will be getting some coordinates that correspond to u.

Second step: If you pick only one time-step of the variable u by taking u(:,:,:,i) then you'll have a 99x50x15 matrix (technically 99x50x15x1, but we can ignore the singleton dimension in this case). To plot a surface you'll need to pick a single (depth level?) or whatever is specified by the third dimension. So to plot the first depth level, that would look like

surf(lon,lat,u(:,:,1,i))

Shankhaneel Basak 2021-5-25

So by saying "getting some coordinates that correspond to u." , you mean to say I need to convert my lat and lon variables to 99 x 50 ? If I were to do so let's say by creating a seperate variable for lat and lon so that I can store just 99x50 dimension of the original lat and lon into those two new variable, how am I supposed to do that? Shall for loop do the job:

for i = 1: 99

for j = 1:50

lon_new = lon[i][j]

lat_new = lat[i][j]

end

A code like this ? Then could I use these new variables for the plot ? Any help is appreciated by me.

Thanks a lot again

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Error in making gif file from a netcdf file

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