ALL values are between 0 and 1:


base data Zoomlevel X:
1	1	0,1	1
0,4	0,2	1	0,3
0,7	0,5	0,7	0,9
0,3	0,3	0,4	1
1	0,5	1	1
1	0,2	0,2	1


data Zoomlevel X-1 (2x3 grid of base):

--> using median
	     |
0,6	     |	   0,8
    	     |
----------------------------
	     |
0,4	     |	   1
    	     |


data Zoomlevel X-2 (4x6 grid of base) :
--> using median
----------------------------



	    0,6



----------------------------

for further zoomlevel the values will shrink so it will be something between 0 and 0.5, which
is not really useful.