extrapolate values from matrices and graphs

Question

ELISABETTA BILLOTTA 2022-3-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1679484-extrapolate-values-from-matrices-and-graphs

评论： ELISABETTA BILLOTTA 2022-3-24

I have a chart of this type which derives from this script:

for i=1:length(longrd)
    for j=1:length(latgrd)
        XX(i,j)=longrd(i);
        YY(i,j)=latgrd(j);
        isel1=find(lonlatgrd(:,1)==longrd(i));
        isel2=find(lonlatgrd(isel1,2)==latgrd(j));
        isel=isel1(isel2);
        ZZ(i,j)=prob(isel);
    end
end
contourf(XX,YY,ZZ,500,'linecolor','none');
colormap jet
hold on
load coastlines.mat
geoshow(coastlat,coastlon,'color','k');
hold on
lonP = 14.2;
latP = 40.8;
plot(lonP,latP,'bo');           
hold on
lonP_t= 13.5;
latP_t= 41.9; 
plot(lonP_t,latP_t,'ro');       
xlim([min(longrd), max(longrd)]);
ylim([min(latgrd), max(latgrd)]);
colorbar;
pbaspect([1 1 1]);
xlim(limlon);ylim(limlat);

whereXX, YY and ZZ are 401x401 double, prob is 1x 160801 double.

from all this graph I would need to extract only the values relative to the point of coordinates lonP_t and LatP_t (shown in the figure), in particular I need to know the value of the Z axis. This value I have to be able to extrapolate it to combine it with other data and then use it in another graph .

Can anyone help me?