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FORESTERS'
TIPS, TECHNIQUES,
AND
TRICKS OF THE TRADE | | |
 RANDOM OR SYSTEMATIC?
In forest inventory, an element of random sampling allows you to calculate sampling error, but a systematic
design might be
more appropriate if you know little about the structure of a natural forest and have no reliable maps.
Where previous
knowledge (imagery/photos etc.) enables some degree of stratification, then randomised sampling within
the strata is likely
to be more productive. There are formulae that one can use (see the FAO Handbook on Forest Inventory)
for post
stratification i.e. assigning a plot to a particular strata after it has been assessed. This works well
with strip plots broken
down into recording units.
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