Table 1. Extent of forest cover and annual rate of change (r) in Nakai-Nam Theun National Protected Area from topographic maps covering the full area of analysis, both corrected and uncorrected for scale differences, and the mean of the two results.

1960s maps 1981 maps r x 100
1960s–1981
ha % ha %
Not corrected for scale 300 092 97.3 286 310 92.8 -0.362
Corrected to the 1981 map scale 284 061 92.1 " " 0.061
Mean 292 077 94.7 " " -0.151