Plot contour3 of data consist x, y, phi

Hello,

I need guidance related to contour3 ploting of my data. I have a matrix contains as below data:

x y phi s

1 1 1 0

1 1 2 0

1 1 3 0

1 2 1 0

1 2 2 1

1 2 3 1

2 1 1 0

2 1 2 1

.....

which x varies from 1 to 4, y varies from 1 to 2, phi varies from 1 to 3 and s could have just 0 and 1 (my matrix is 689689 by 4, and this is just a sample of my data). I need to contour3 of my data for the rows which just s=1. So for first step I have to filter my data. The rest of my data which has x, y and phi in each row represents a point. I need to contour3 plot for each level of phi which contains lots of point in that level of phi. I tried to plot it but it create a contour3 for each point in each level (For example, I have more than 1000 points which has same phi so in each level of contour3 for a phi it creates 1000 contour3 around each point!). But I need a contour3 for more than 1000 point on each level. It would be great if you could guide me. Thanks.