by David Herries | Mar 30, 2015 | Forest Inventory, PlotSafe, YTGEN
The modelling of diameter and height relationships during a forest inventory is often undertaken when a subset of tree heights is measured that will then be used to predict the heights of unmeasured trees. One such equation for doing this is the Petterson regression,...
by David Herries | Mar 30, 2015 | Forest Inventory, PlotSafe, YTGEN
PlotSafe is now available for use by Spanish forestry companies and field crews with the release of a Spanish install. To ease the language barrier as the software is adopted in South America, a Spanish version is now available from Silmetra. This replaces all the...
by David Herries | Dec 5, 2014 | Forest Inventory, GIS and Mapping, LiDAR, PlotSafe, YTGEN
David Herries recently presented at ForestTech 2014 an overview of Plot Imputation as a method for development of forest yields using YTGEN. The presentation was designed to introduce and simplify the concepts of k-nearest neighbour and plot imputation while outlining...
by admin | Nov 30, 2014 | Forest Inventory, PlotSafe, YTGEN
Virtual DBH’s are used to process diameters of forks and reductions when processing data from PlotSafe to YTGen. A virtual DBH is a DBH applied to a stem where the stem does not exist at breast height. It represents the over bark diameter that, in combination...
by admin | Nov 30, 2014 | Forest Inventory, YTGEN
What is random numbers and how are these used within YTGen? An example use of random numbers in YTGEN is for the calculation of height at which a stem breaks when felled e.g. the whereabouts of break, random numbers hereby only determinate the randomness of a breakage...
by admin | Jul 29, 2014 | Valuation, YTGEN
This article summaries the main uses of the I300 growth model within YTGen. In summary the 300 Index model is a New Zealand national growth model for Pinus radiata. The Plantation Management Co-operative initiated its development before 2005; later Future Forests...
by admin | Jul 10, 2014 | Harvesting, Valuation, Value Recovery, YTGEN
Woodlot valuation are traditionally based on averages which tend to ignore the effects of variability or risk. Sources or variability in woodlot valuations typically included the following: Log price changes JAS conversions factors m3 / tonne conversion factors Yield...
by admin | Dec 6, 2013 | Forest Inventory, PlotSafe, YTGEN
Tree height prediction and modelling is an important part of the data conversion, below article describes the equations and their difference tree height prediction. The subject of modelling tree heights is described in the following article; Modelling Tree Height in...
by admin | Nov 27, 2013 | PlotSafe, Training, YTGEN
One of the foundations within YTGen is its flexibility when it comes to choosing which log grades to produce. The Cutting Strategy (*.YTS file) options within YTGen offers the user a wide range of options to define different types of log products. These can be...
by admin | Nov 26, 2013 | Forest Inventory, PlotSafe, YTGEN
We often get questions from new users on the use of “shorts” and “longs” sweep assessment in cruising dictionaries such as RAD05, RAD05A and RAD06. It is worth a few moments to understand the history and versatility in assessment sweep in...
