Getting all pixel values along this line

Question

Sophia 2016-7-13

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/295517-getting-all-pixel-values-along-this-line

评论： Walter Roberson 2016-7-14

I want to check how the pixel values along this line have been changing through the different time intervals. This image is shows the mean data values for 36 years, later on i want to compare how the value along this line have been changing through time.

Which MATLAB function I can use to find the values of the pixels along which this line is passing?

figure(1);
clf;
left1 = 0.40;
cb_bottom = 0.060 ;
cb_width = 0.2 ;
cb_height = 0.02 ;
long2 = long(1:4:361,1:4:361);
lat2 = lat(1:4:361,1:4:361);
U2 = mean_wint_u(1:4:361,1:4:361);
V2 = mean_wint_v(1:4:361,1:4:361);
idx = ~isnan(U2) & ~isnan(V2); 
m_proj('Stereographic','lat',90,'long',300,'radius',35,'rect','on');
m_contourf(long,lat,mean_wint_rho(:,:),100,'linestyle','none'); mean_wint_rho is 361*361
m_grid('linewi',1,'tickdir','out',...
        'xtick',[],'ytick',[]);  
m_coast('patch',[.6 .6 .6],'edgecolor','k');
m_elev('contour',[ ],'edgecolor',' ');  
m_quiver(long2(idx),lat2(idx),U2(idx),V2(idx),2,'LineWidth',1,'Color','k')   
colorbar( 'location','southoutside',...
    'position', [left1 cb_bottom cb_width cb_height])
hold on;
m_plot([146.5 -116 -99],[75.5 87 80],'r-'); [% long, lat] values of the line