问题
If I have a matrix with first and second columns related to coordinates and third one related to a value, how could I interpolate third column values creating iscurves and colorbar ranges?
M=[
342854 657145 309
342996 657287 73
343137 657428 84
342006 657145 1122
342147 657287 777
342289 657428 426
342430 657570 638
342571 657711 200
342713 657852 787
341723 657711 1141
341864 657852 555
342006 657994 1157
342147 658135 355
342289 658277 374
341299 658135 467
341440 658277 672
341582 658418 459
341723 658560 735
341864 658701 781
341016 658701 1233
341157 658842 218
341299 658984 539
341370 659054 1351];
and obtain something like the attached image
回答1:
As your data is not in an uniform grid, you need to use griddata for interpolation.
[xq,yq]=meshgrid(linspace(min(M(:,1)),max(M(:,1)),100),linspace(min(M(:,2)),max(M(:,2)),100));
zq=griddata(M(:,1),M(:,2),M(:,3),xq(:),yq(:),'cubic'); %cubic for smoother results
[c,h]=contourf(xq,yq,reshape(zq,100,100));
clabel(c,h);
来源：https://stackoverflow.com/questions/51670744/how-to-calculate-a-triangular-interpolation-from-values-in-coordinates-in-matlab