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我对测量温度、电导率和压力的水下滑翔机的数据进行了大量编辑。从中我们得到盐度、密度和西格玛(西格玛 = 密度 - 1000)。该乐器的采样效果不是很好,因此需要进行大量编辑。我需要为海报制作“漂亮”的等高线图。这不适用于出版物,所以我不担心过滤或平滑的数量。

我在使用 sigma(密度)的等高线时遇到问题,请参见下文。

sigma 和插值 sigma 的等高线图

黑色轮廓线应该描绘 sigma 的填充轮廓,但它们看起来很糟糕。在完成任何网格化之前,数据被分箱了 1 m。这是用于生成图的代码。

这是用于生成此图像的代码

 % load data
 load Matlab_data
 maxy = 50;

t = 1;
Tstep = t./24./60; % Grid data on t minute time intervals
X1 = time(1)-Tstep:Tstep:time(end)+Tstep; 
Y1 = 0:1:maxy; % Grid data on 1 meter depth intervals

ygrid = [' Depth grid: ' num2str(diff(Y1(1:2)))];
xgrid = [' Time grid: ' num2str(diff(X1(1:2)))];

[X,Y]= meshgrid(X1,Y1);
bad_vals = isnan(sal) .* ~isfinite(sal) .* isnan(press); % don't include NaNs or funky imaginary salinities in the contours
vals = find(bad_vals == 0);

Zd = griddata(time(vals),depth(vals),density(vals),X,Y);
Zt = griddata(time(vals),depth(vals),temp(vals),X,Y);
Zs = griddata(time(vals),depth(vals),sal(vals),X,Y);
Zst = griddata(time(vals),depth(vals),sigmat(vals),X,Y); 

% Interpolate over gaps
vst = interp1gap(sigmat);
vs = interp1gap(sal);
% Grid interpolated salinity and sigma data
Zst_interp = griddata(time(vals),depth(vals),vst(vals),X,Y);
Zs_interp = griddata(time(vals),depth(vals),vs(vals),X,Y);

 %% Contour Plot
  % Set up the figure
  figure3=figure('Position', [2000, 50, 1500, 500]);
  clf
  colormap(jet);

% Temperature
ax1 = subplot(2, 1,1);
  [c,h] = contourf(X,Y,Zst,50,'linestyle','none'); %,[4:.5:9],'linestyle','none');
  cRange = caxis;
   hold on
  [c2,h2] = contour(X,Y,Zst,[24 24.5 25],'color','k'); %,[22:.5:26.5],'linewidth',1.5,'color','k');
  clabel(c2,h2,'fontsize',10,'labelspacing',150);
  set(h2,'linewidth',1)
  hc = colorbar;
  colormap(jet);

  datetick('x','mm/dd','keeplimits','keepticks');

  grid on;
  box on
  pos = get(gca,'position');
  set(gca,'YDir','reverse')%,'position',[pos(1) pos(2) pos(3)-.06 pos(4)]);
  set(gca,'xlim',[time(1)+.5./24 time(end)-.5./24],...
      'ylim',[0 maxy],'fontsize',8,'xminortick','on','yminortick','on');
  set(get(hc,'ylabel'),'string','Sigma-Theta (kg m^-^3)','rotation',270,'verticalalignment','bottom');
  ylabel('Ocean Depth (m)');
  xlabel('Date');
  %title(['Sigma Theta (kg m^-^3) -' strrep(tag,'_','\_')], 'fontweight', 'bold','FontSize',12)
  title(['Sigma Theta (kg m^-^3) :' ygrid xgrid ], 'fontweight', 'bold','FontSize',12)    

ax2 = subplot(2, 1,2);
  %h=pcolor(X,Y,Zst);
  [c,h] = contourf(X,Y,Zst_interp,50,'linestyle','none'); %,[4:.5:9],'linestyle','none');
  shading interp
  hc = colorbar;
  cRange = caxis;
  hold on
  [c2,h2] = contour(X,Y,Zst_interp,[24 24.5 25],'color','k'); %,[22:.5:26.5],'linewidth',1.5,'color','k');
  clabel(c2,h2,'fontsize',10,'labelspacing',150);
  set(h2,'linewidth',1)
  hc = colorbar;
  colormap(jet);
  caxis(cRange);

  datetick('x','mm/dd','keeplimits','keepticks');

  grid on;
  box on
  pos = get(gca,'position');
  set(gca,'YDir','reverse')%,'position',[pos(1) pos(2) pos(3)-.06 pos(4)]);
  set(gca,'xlim',[time(1)+.5./24 time(end)-.5./24],...
      'ylim',[0 maxy],'fontsize',8,'xminortick','on','yminortick','on');
  set(get(hc,'ylabel'),'string','Sigma-Theta (kg m^-^3)','rotation',270,'verticalalignment','bottom');
  ylabel('Ocean Depth (m)');
  xlabel('Date');
 % title(['Sigma Theta (kg m^-^3) -' strrep(tag,'_','\_')], 'fontweight', 'bold','FontSize',12)

  title(['Sigma Theta interp1gap (kg m^-^3) :' ygrid xgrid ], 'fontweight', 'bold','FontSize',12)

请帮忙!我有两个问题......第一个也是最明显的是丑陋的黑色轮廓线,这些应该很好地“流动”在填充的轮廓周围。如果有人对如何平滑这些有经验或建议,请传递它,如果可能的话,附上代码。

第二个问题在于底部情节,我需要填补数据中的空白(由于编辑原始不良数据)。我使用了函数 interp1gap,在文件交换中可用,但它也将数据插入到更深的深度,这是我不想要的。我只想填补空白,例如通过选择它们的水平邻居并填充。

如果您对解决此问题有任何建议,请告诉我!我附上了数据(Matlab_data.mat),它包括时间、深度、sal(盐度)、sigmat、压力、温度和密度。

这是网格问题吗?请尽可能具体,如果您有时间对此进行研究,将不胜感激任何代码和数字。

数据可用下拉框https://www.dropbox.com/s/mjd8f9bzdvwddk5/Matlab_data.mat?dl=0

非常感谢您!

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