Contents

Key Indexes

Ministry of Forests, Lands and Natural Resource Operations

Vegetation Resources Inventory

Forest Inventory Statistical Rigor (Biometrics) Support

Variable Density Yield Prediction

VDYP Publications and Support

User Guides

Title

Date

•

Variable Density Yield Projection
Volume 1 - VDYP 7 Overview

09 February 2009

[download]

 

This manual provides general information about VDYP7 application and describes how to use this documentation set. The VDYP7 core programs, common to each interface, are described within this overview.

 

•

Variable Density Yield Projection
Volume 2 - WinVDYP 7 User Guide Version 2.0

09 February 2009

[download]

 

This manual describes how to use this easy to use interactive interface designed to predict yields one stand at a time.

 

•

Variable Density Yield Projection
Volume 3 - VDYP 7 Console Interface Guide

September 2009

[download]

 

This manual describes how to use this interface to generate yield tables from text files in .csv format.

HELP and Frequently Asked Question

For Help or Frequently Asked Questions on VDYP 7 Background, Core Program, VRIMS, WinVDYP7, VDYP7 Attribute Adjustment, and other VDYP 7 questions, download here.


Examples

Read Instructions below:

•
 Online Console Training Example
[download] pdf version [download]word version
•
Example Package (contains 12 files)

Word File - ".doc": Contains instructions on how to follow-through with the example.
Please read this file through before you set-up the example data.

Files ending in ".CSV": Required to provide input to VDYP7
File ending in "ini" Specifies the contents and formats of the data in the 8 CSV files.

 

Comparison Reports
Title
   digital format
•
 VDYP6 / 7 Comparison Reports  

As VDYP7 uses basal area instead of crown closure for density calculations, volume predictions should more closely approximate actual changes in volume across the density range. Projected volume trends will also differ between the two models. With VDYP7, the volume trend is affected by changes to Lorey height and BA over time. With VDYP6, crown closure is held static over the projection and volume increase depends strongly on height growth. Thus VDYP7 volume projections are more likely to decrease in the long term since the Lorey height of stands tend to flatten and the BA may also decline in old stands. The new stand-level decay model used in VDYP7 tends to increase the deduction for decay as stands get older to better emulate actual conditions.

As part of the VDYP7 implementation process, reports which compare VDYP7 volume predictions to VDYP6 are soon to be released:

 
 
•
 TSP Results by TSA   [download]
 
•
 100 Mile House Attribute Adjustment Comparison   [download]
 
• TSA-Based Volume Comparison of VDYP 6 & VDYP 7 Appendix Addendum 23 March 2009   [download]
 
• VDYP 7 Sensitivity Analysis August 2008   [download]
 
•
 Province-wide comparison of current volumes using unadjusted attributes and ground data in units where VRI Phase 2 is complete  
[download]
 
•
 Comparison of unadjusted attributes used in the Morice TSA TSR;  
[download]
 
•
 Comparison of adjusted attributes used in the Dawson Creek TSA TSR;  
[download]
 
•
 Comparison of current volumes using adjusted attributes in six  
[download]