Plotting problem & Does the matlab can plot raster map?

I have coordinates (X,Y) and its corresponding value (Z), How to visualize them and distinguish with different color for each point? Just like a raster file that every pixel has a value in it.

Thank you very much!

[KSSV]

It is not a raster data. These are scattered points.

[ZC Song]

So could you give me a hint that how to transfer those data to raster format?

Answer 1

[KSSV]

Let X,Y,Z be your m*3 data.

x = unique(X) ; nx = length(x) ; 
y = unique(X) ; ny = length(y) ; 
X = reshape(X,nx,ny) ;
Y = reshape(Y,nx,ny) ;
Z = reshape(Z,nx,ny) ; 
figure
pcolor(X,Y,Z)
shading interp 
figure
surf(X,Y,Z)
shading interp 

[ZC Song]

Thank you very much for your reply!

It seems there is some error:

Now I attached the data file named "ans" which contains X,Y,Z data.

[ZC Song]

[KSSV]

Huumh...attach your data. Or else try this:

m = 500 ; n = 500 ; 
x = linspace(min(X),max(X),m) ; 
y = linspace(min(Y),max(Y),n) ; 
[XX,YY] = meshgrid(x,y) ; 
ZZ = griddata(X,Y,Z,XX,YY) ; 
pcolor(XX,YY,ZZ)
shading interp 

[KSSV]

To display use:

scatter(X,Y,100,Z,'s','filled')

[ZC Song]

Thanks for your patience. I've uploaded the data name 'ans.mat'

[ZC Song]

My final goal is this:

I have a DEM map, and from my simulation I can get a .asc file data. Now I transform the .asc data to geoference gird data. As you can see in the attachment.

I want to superpose them together.

Like this:

[ZC Song]

Thanks for your help I think I'm close to the goal! One question is how to only display one color? like yellow?

Next step would be superpose this map to the .raster map or a .tiff map

[KSSV]

YOu have only two values in Z 0 and 1. You can plot them like below:

scatter(X(Z==1),Y(Z==1),'s','filled','r')
hold on
scatter(X(Z==0),Y(Z==0),'s','filled','b')

[ZC Song]

Great! it works!

Thank you very much！