Strata

A Stratum in ST-Sim refers to a subset of the entire landscape being considered for analysis. Strata are typically used to divide the overall landscape into regions, each of which can have different model parameters.

ST-Sim recognizes three types of Strata:

1. Primary Strata

Primary Strata typically represent a biophysical or ecological stratification of the landscape.

2. Secondary Strata

Secondary Strata typically represent a management stratification of the landscape such as ownership or jurisdictional boundaries.

3. Tertiary Strata

Tertiary Strata are used to represent any additional landscape region required by the model.

Note

Strata are completely flexible; they can be used to represent any kind of landscape region. Primary Strata can change during a simulation, but secondary and tertiary Strata are fixed for the entire simulation.

Remarks

At a minimum, each Stratum must have a Name. However, the following additional columns are available from the Context Menu.

Item	Description
ID	The ID for the Stratum when running a spatially explicit simulation.
Color	The legend color for the Stratum when displaying Spatial Maps. Double click in a cell to open the color editor and choose a color.
Map Legend	The map legend for the Stratum when displaying Spatial Maps.
Description	A description of the Stratum.

Remarks

For spatial simulations, ID values for a Stratum are required and must correspond to the ID values for the Stratum raster defined in the Spatial Initial Conditions Property.