Try something like this:
autocam off
position camera 50,50,-50
point camera 0,0,0
This will tell the camera not to jump from one newly loaded object (your tiles) to the next, place the camera at the corner of a 100,100,100 'cube', and tell it to look down at the center. By changing the X and Z axis between positive and negative values you can jump from one corner to the next.
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TAZ
If you need to zoom in and out, change all three values of the position camera command to maintain the viewing angle. IE, 25,25,-25 or 75,75,-75.