>FVS expects a sample point ID for each tree record...it uses sample point to >calculate certain point level competition terms (point basal area and point >ccf) that are terms in some of the diameter and height increment >equations...FVS utilizes both stand level factors and point level factors in >increment equations.
For implimentation specific details, the point level values would have to be created internally. Otherwise we would have to develop an end-all-do-all plot/tree/shrub/stand level user defined data type for all the models out there. The object here is to maintain an external interface to the software. What the software does internally is up to the developer.
>Some other FVS peculiarities are a prescription code (iprsc), which is a very >short (1 character) int 1-9 which can be used in conjunction with one of the >thinning keywords to mark trees for cutting....there's also a "value class" >code, which was 1-3 last time I checked, it's also used in conjunction with >some of the thinning keywords.
These would be defined as the user codes in the interface....