Ambient Ozone Exposure in Czech Forests: A GIS-Based Approach to Spatial Distribution Assessment

Table 2

RMSE values (ppb) from cross-validation: comparison for different interpolation techniques for O₃ means, 2007-2008 vegetation seasons.

	Seasonal O3 mean (ppb)
	2007	2008	Average
	40.15	38.87	39.51
Interpolation technique	RMSE (ppb)
	2007	2008	Average	Ranking
IDW	5.23	4.97	5.10	11
RBF	4.92	4.69	4.80	10
OK	4.73	4.67	4.70	9
LR	3.45	3.30	3.38	5
LR + res_IDW	3.49	3.48	3.48	8
LR + res_RBF	3.40	3.37	3.38	6
LR + res_OK	3.31	3.15	3.23	1
ALR	3.43	3.38	3.40	7
ALR + res_IDW	3.44	3.22	3.33	4
ALR + res_RBF	3.41	3.15	3.28	3
ALR + res_OK	3.39	3.07	3.23	1