Comparison of Sampling Designs for Estimating Deforestation from Landsat TM and MODIS Imagery: A Case Study in Mato Grosso, Brazil

Table 4

Comparison of the relative error (%) extrapolated from two methods.

Sampling blocks^#	Random sampling		Stratified proportional allocation		Stratified Neyman optimal allocation		Systematic sampling
	E1*	E2*	E1	E2	E1	E2	E1	E2
100 (83)	29.43	16.51	14.30	9.32	8.34	4.15	15.02	12.14
350 (355)	13.52	12.72	4.14	6.12	3.74	3.36	5.56	6.06
500 (507)	4.40	3.63	4.04	5.16	3.62	2.82	7.21	10.12

The number in the parentheses is the number of sampling blocks used for the systematic sampling.
*E1 means the simple extrapolation from (5), and E2 is the regression extrapolation from (6) based on the relationship between the MODIS-derived and TM-derived deforestation.