How to create isocurves with given values in coordinates?

If we have a matrix which contains 3 columns of X coordinate, Y coordinate and assigned values to those coordinates respectively, how could be create a plot with isocurves similar to contour function in matlab?

 m=[342854  657145  32
342996  657287  12
343137  657428  12
342359  657075  34
342501  657216  26
342642  657357  41
342784  657499  12
342925  657640  34
342006  657145  56
342147  657287  32
342289  657428  24
342430  657570  53
342571  657711  23
342713  657852  23
341935  657499  24
342076  657640  43
342218  657782  45
342359  657923  3
342501  658065  45
341723  657711  3
341864  657852  52
342006  657994  12
342147  658135  23
342289  658277  54
341511  657923  32
341652  658065  14
341794  658206  18
341935  658347  43
342076  658489  22
341299  658135  6
341440  658277  75
341582  658418  33
341723  658560  23
341864  658701  12
341228  658489  43
341369  658630  34
341511  658772  52
341652  658913  41
341016  658701  3
341157  658842  15
341299  658984  19
341440  659125  32];

 X=m(:,1);
 Y=m(:,2);
 Value=m(:,3);

Answer 1

[Star Strider]

One approach:

figure
stem3(X, Y, Value)                                      % Exploratory Plot To View Data
grid on

[Xm,Ym] = ndgrid(X,Y);                                  % Create Matrices
Vm = griddata(X, Y, Value, Xm, Ym);                     % Interpolate Grid

figure
contour3(Xm, Ym, Vm)
grid on

I used contour3 here to demonstrate the problems. Experiment with surfc and contour.

Your data do not easily lend themselves to a contour plot. You will need to work with your data a bit to get a better representation.