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Testing showed that in the New Brunswick Forest Inventory a considerable increase in sampling efficiency, over that of simple random sampling, was obtained by the use of three bases of air-photo stratification within a double sampling framework. These gains were particularly good for total softwood volume, up to 88% gain being achieved for this volume category. Gains in efficiency for softwood sawlog volume were somewhat disappointing, however, and a modification in sampling design is suggested, which should increase sampling efficiency for this important volume category. Stratification by maturity group was found to be less effective than that by cover type and volume class; the addition of maturity group stratification to that by cover type and volume resulted in little further gain in efficiency.

TESTING THE EFFICIENCY OF AIR-PHOTO STRATIFICATION USED IN THE NEW BRUNSWICK FOREST INVENTORY