Initial Conditions and Stand Dynamics

There are nine core files that play an integral role in representing initial conditions and stand dynamics in the Patchworks data model. These files provide the data structure and connectivity for Patchworks in a way that is flexible for both detailed forest stand characteristics or summations of the entire planning area. The nine core files are listed in Table 5, “Stand dynamics core input files”.

Table 5. Stand dynamics core input files

File namePurpose
blocks.csv Defines initial block conditions
features.csv Define feature attributes
products.csv Define product attributes
curves.csv Describe time series attribute curves referenced by feature and products files
treatments.csv Define treatments and corresponding application rules
tracknames.csv Describes the origin of each track in terms of the original stratification variables
strata.csv Describes how the stratification variables change as treatments or succession events occur
package.csv Defines a treatment package
packagesequence.csv Defines the sequence of treatments within a package

These nine core files represent the Patchworks data model in a fully normalized relational format. Figure 177, “Patchworks data model entity relationship diagram” shows the relationship between the core tables in the data model. When combined together, the Patchworks model forms a fully extended table (or matrix) that is the result of linking and indexing all of these core files.

Figure 177. Patchworks data model entity relationship diagram


Table and field names shown in italics are optional and if omitted will be replaced with default values.

To describe the role and relationship of these files, we will first examine what the files are, what information is contained in these files and how they are related to each other. See the section called “Patchworks data model example” for a more detailed example from the sample dataset that makes a tangible link from the core files to an actual forest stand dataset.