There's been a lot of new features for Assisi since my last post. I'll discuss some of the bigger ones now and take a closer look at a few of them in the next couple months...
Forest Inventory Expansion
Copy a Forest Inventory from Strata to Stand
Forest Inventory expansion is the process of copying the inventory from a source to a destination. Both source and destination can be either strata or stands. There are typically two common uses of inventory expansion...
If you maintain a stratified inventory where results are stored by forest type, then typically your inventory source are strata (types) and destinations are stands (polygons). When an expansion is run, the results from your stratified inventory are copied to your stands. You can then make landscape level reports from your updated stand inventory.
Even if you are not using a stratified inventory, you may want to copy inventory from one stand to another when you have not yet cruised every forest stand. The process is the same in Assisi: you add an Expansion to a stand and set from where its inventory is sourced. When processed, the current inventory of the source is copied to the destination. The destination records the source of its inventory so you always know where the inventory came from, whether browsing stands in the Inventory Editor or on Stand Table reports...
Inventory Editor showing source of inventory is from an expansion rather than a cruise.
Report of an expanded stand. Note source is from an expansion.
Growing Logs Called in the Field
Logs called in the Field Maintained During Growth
If logs were recorded in the field they will maintain their length when growing inventory or simulating management plans. Only the diameters will change. Lengths will remain the same. Lengths above called logs will grow new merch quality logs, but those originally called in the field will have the same length throughout growth.
If log quality was also recorded at cruise, the qualities called will also be retained. This way, called logs are able to change their grade as their diameters grow but will always be restricted to grades with the original qualities. For example if logs were called with foreign and domestic qualities, when they are grown they will change in diameter and grade but retain their quality calls. Their grades will always be restricted to the same foreign or domestic qualities that were originally called in the field.
Acadia Forest Growth Model Added
New Models Added for Acadia Region
The Acadia calibrations include models appropriate for the acadian region of the US and Canada: Maine, Nova Scotia, New Brunswick and southern parts of Quebec. Tree height, taper and growth models are research from the Univ. of Maine School of Forestry. The Acadia growth and taper functions, opens up a new set of options for forat inventory and log scaling not available when using volume equations or volume tables. Variable log length and quality calls are just two techniques that can now be used in the Acadian region. Having a new and robust growth model will create important perspectives on the performance of existing models such as FVS and NE TWIGS.
ORGANON Growth Model Updates
Genetic Modifiers Added
ORGANON includes a response function that adjusts tree growth to better match genetically improved stock. The settings for ORGANON's genetic functions are now available in Assisi calibrations. The IsGeneticPlanted setting turns ORGANON's genetic responses on or off. The GeneticDBH and GeneticHeight settings set the coefficients for ORGANON's response function.
Fertilization Model Added
ORGANON includes a tree fertilization response model that boosts growth according to an application of nitrogen fertilizer. A new Fertilization action has been added to simulate fertilizations using ORGANON's fertilization model. Fertilization rules are set up like other rules in Assisi using the Rules Editor. A fertilization rule can include up to 400lbs of nitrogen applied per acre. Fertilization actions can be scheduled during inventory growth, management plan simulation or as part of the historical record of a stand.
Interrupting 5 Year Growth Intervals
ORGANON is a 5 year growth model from which Assisi interpolates 1 year rates. This is a correct use of the model and produces the same results as the DOS version of ORGANON. However, when performing a fertilization or thinning in Assisi, the 5 year interval can be "interrupted" and a new 5 year sequence started. Although this has enabled growth response to be immediately visible on a yearly basis, it has introduced a bias and produces slightly different results than if the same actions were simulated in DOS ORGANON where interruptions are not possible. An option to prevent 5 year interruptions has been added that delays fertilizations and thinnings until the next 5 year interval.
Northeast Growth Model Updates
Volume Equations and Volume Tables Added
The board and cubic equations of Scott (1981) were implemented. These equations model the volume tables of the Northeastern Forest Survey, in use since 1940. The composite volume tables of Gevorkiantz & Olsen (1955) were also added. The authors found these tables adequate throughout the Northeast where trees are considered "average run".
Metric and English Units
Models can be a Mix of Metric and English Units
Assisi has supported metric in the past by assuming all data and equations are in either metric or English units. However, there are times when field survey data are in one unit and forestry models in another. For example, the new Acadia growth models are metric growth models but data may be in English (US) or in metric (Canada) units. Furthermore, one source of models may not have every equation needed for a comprehensive forest inventory, so a mix of models with different units may be needed. For example, the English TWIGS sawlog height model might be used alongside the Acadia metric models because Acadia does not have a sawlog height model.
With this version of Assisi, each equation specifies its own units so that mixed English and metric models can be used where needed. The equation units are separate from the data units so that data and equations can be in different units. Furthermore, each equation determines its own type of units and so can be mixed as needed.
Global Graded or Ungraded Volumes
Process Volume as Either Graded or Ungraded
Log volume in Assisi has always been stored in both graded and ungraded terms, simultaneously. Volume tallies for board, cubic, carbon and user amounts are not exclusive of each other, except when graded. Meaning, a given log will contribute its volume to all types of volume at the same time... if not graded. The results have been as if all volume is board or all volume is cubic etc. When a Stand Table report is made, the board and cubic volumes are inclusive of each other: cubic is from all logs and board is from all logs. Except in the case of graded volume where only one type of volume maps to each grade.
Now, log volume throughout Assisi can be processed as all graded or all un graded. This means all tables in Assisi can be made to store volume as graded rather than just the graded volume tables. When the Volume Tallies setting is "Graded", all volume is mapped according to Market grades and is stored according to how the grades map volume. When a Stand Table report is made, the board and cubic volumes will now be exclusive of each other: cubic will be from only grades mapping cubic and board from only grades mapping board.
Forest Simulation Result Tables Added to Stand Simulator
Forest simulation results were always stored in the database, but now results can be easily browsed within Assisi as simulations are run. Tables of results were added for stands, species, trees and graded volume. Values include size and density measures as well as tree volumes. Both harvested volume and standing volumes are shown. Table data can be filtered, sorted and copied to Excel using the usual table editing features of Assisi.
Tree Species Groups Added to Thinning Rules
Groups of tree species can be added to thinning rules rather than listing them one at a time. Thinning rules that were for single tree species can now be applied to groups of species by listing more than one species for the thinning rule.
Drag and Drop Whole Datasets to the Desktop
Import and export from editors such as the Field Data Editor was always possible using the Import and Export buttons. But now you can simply drag items from editors to the desktop to create export files. Dragging them back into another database imports them into that database. Whole sets of field survey data and calibrations can be easily transferred between Assisi systems this way.
Export to FORSEE Added
An export to FORSEE, a growth and yield program that incorporates the CRYPTOS and CACTOS growth models popular in the state of California has been added.
Save and Load Custom Table Layouts
Custom table layouts can now be saved and reloaded. A custom table layout includes which columns are displayed, their order, sorting and filtering and summary equations added to table footers. After configuring a table for a specific task, you can save the layout and reload it when you need the same layout of fields.
And of course the documentation has been updated. This latest version in particular has updated all parts of the interface sections. The Assisi User Guide is extensive and is now 400 pages!