3d plot with surface

so i have x,y,z coordinates like this

[701853.620,9309969.784,18.350;701853.666,9309969.286,18.350;701850.380,9309968.984,18.350;701850.732,9309969.519,18.350;701850.709,9309969.494,19.903;701851.294,9309969.56,19.861;701851.981,9309969.629,19.88;701852.715,9309969.703,19.919;701853.445,9309969.778,19.841;701853.444,9309969.771,20.958;701852.714,9309969.702,20.93;701851.979,9309969.624,20.896;701851.29,9309969.552,20.906;701850.706,9309969.489,20.36;701850.704,9309969.485,20.934;701851.288,9309969.546,22.421;701851.979,9309969.623,22.372;701852.715,9309969.706,22.336;701853.446,9309969.78,22.388;701853.620,9309969.784,22.950;701853.666,9309969.286,22.950;701850.380,9309968.984,22.950;701850.732,9309969.519,22.950]

when i scatter3 these coordinates the result is on the photo, i want to make a surface the same with the coordinates using scatter function. so i use this script

[Uxy,iaxy,icxy] = unique([x;y]','rows');
x = Uxy(:,1);
y = Uxy(:,2);
z = z(iaxy)';
xv = linspace(min(x),max(x),500);
yv = linspace(min(y),max(y),500);
[X,Y] = meshgrid(xv,yv);
Z = griddata(x,y,z,X,Y);
surf(X,Y,Z)
zlim([0,max(Z(:))])
shading('interp')
view(35,10)

but the result is not same with the scatter function. anyone can help? thanks

Answer 1

[Walter Roberson]

You have points with duplicate x y . When you do that unique on x y pairs, you are losing the input from some of the points.

I would say that there is no reasonable surface for that set of points -- not unless you know more about continuity of the points.

Perhaps you should look into using boundary() and creating patches.