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The provincial
Vegetation Resources Inventory (VRI) process is basically a three-phase process. The VRI
photo-interpretation is often referred to as Phase I.
Phase II is the VRI ground sampling of the photo-interpreted mapsheets, which is then broken down
into three parts. The first part is the initial statistically based ground sampling. Secondly,
a subset of the ground samples is more intensively sampled, called
Net Volume Adjustment Factor (NVAF)
[.pdf] cruising (see also
NVAF Errata
document [.pdf]). This process is used to estimate individual tree volumes. Finally, the trees in
the NVAF samples are destructively sampled to determine actual volumes.
Once Phase II is completed, Phase III of the process is the derivation and application of adjustment
factors to the Phase I datasets for analysis purposes.
Prior to the initiation of a VRI project, a high level plan, called a VRI Strategic Inventory Plan
(VSIP) is prepared. If the project proceeds a VRI Project Implementation Plan (VPIP) is
developed to implement the strategic plan, taking into account operational considerations. These two
plans must be in place before work can proceed.
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