Key concepts 3 Spatial data analysis - Spatial Data Analysis: An Introduction for GIS Users - page 51

45 44 44 43 42

43 42 39 36 41

Output grid
(3 3 cells)
location
is shaded

Input grid
(5 5 cells)

38 32 34 35 38

39 41 37 38 39

32 41 35 31 39

Position 1 Position 2

45 44 44 43 42 45 44 44 43 42

43 42 39 36 41 43 42 39 36 41

38 32 34 35 38 38 32 34 35 38

39 41 37 38 39 39 41 37 38 39

32 41 35 31 39 32 41 35 31 39

40.11 38.78

40.11

Through the remaining seven positions...

38.78 39.11

40.11

38.33 37.11 37.44

Output grid

36.56 36.00 36.22

Figure 4.5 Mean average computed for a 3 ¥ 3 pixel moving window.