用matlab 读取处理好的GRACE数据的代码

以下是用Matlab读取和处理GRACE数据的示例代码：

% 读取GRACE数据文件
filename = 'GRACE_data.nc';
nc = netcdf.open(filename, 'NOWRITE');
lat = netcdf.getVar(nc, 0);
lon = netcdf.getVar(nc, 1);
data = netcdf.getVar(nc, 2);
netcdf.close(nc);

% 绘制GRACE数据的地图
figure;
worldmap('World');
load coastlines;
plotm(coastlat, coastlon, 'k');
pcolorm(lat, lon, data);
colorbar;

% 计算GRACE数据的时间平均值
n = size(data, 3);
mean_data = zeros(size(data, 1), size(data, 2));
for i = 1:n
mean_data = mean_data + data(:, :, i);
end
mean_data = mean_data / n;

% 绘制GRACE数据的时间平均值的地图
figure;
worldmap('World');
load coastlines;
plotm(coastlat, coastlon, 'k');
pcolorm(lat, lon, mean_data);
colorbar;

% 计算GRACE数据的时间序列
time = netcdf.getVar(nc, 3);
n = length(time);
ts_data = zeros(n, 1);
for i = 1:n
ts_data(i) = mean(mean(data(:, :, i)));
end

% 绘制GRACE数据的时间序列
figure;
plot(time, ts_data);
xlabel('Time');
ylabel('GRACE Data');
title('GRACE Time Series');