Attributes

From Syncrosim
Jump to: navigation, search

Attributes represent a set of advanced properties which can be used to roll up simulation results according to areas aggregated by either state classes or transitions. In addition, attributes can also influence run outcomes with the use of targets or adjacency multipliers.

State Attribute Values

The State Attribute Values property specifies, for each state attribute, the value (per unit area) to be applied when calculating the value of the attribute for each combination of stratum, state class and age range. Once attributes have been defined (under Project Definitions), each combination of attribute type, stratum, state class and age range is then assigned a numeric value using the State Attribute Values property; this value is then used as a multiplier on the area in each state class in order to calculate the corresponding value for each attribute. The state attribute values are provided for each scenario so that users can vary the way in which attributes are calculated between scenarios.


The fields for the State Attribute Values property are:

State Attribute Type

The state attribute type for which the record applies.

Primary Stratum (optional)

The primary stratum (Vegetation Type by default) for which the record applies. If left blank then the record applies to all primary strata.

Secondary Stratum (optional)

The secondary stratum (Planning Zone by default) for which the record applies. If left blank then the record applies to all secondary strata.

Iteration (optional)

The iteration for which the record applies. If left blank then the record applies to all iterations.

Timestep (optional)

The timestep for which the attribute record applies. If left blank then the attribute record applies to all timesteps. An attribute record continues through time until another Timestep value is encountered by the model for the same state attribute type in the same stratum, at which point the new attribute value will be applied.

State Class

The state class for which the record applies.

Age Min (optional)

The minimum age for which the record applies.

Age Max (optional)

The maximum age for which the record applies.

Value

The value (per unit area) to be used when calculating the state attribute for this combination of stratum, state class and age range.

Transition Attribute Values

The Transition Attribute Values property specifies, for each transition attribute, the value (per unit area) to be applied when calculating the value of the attribute for each combination of stratum, transition group and age range. Once attributes have been defined (under Project Definitions), each combination of attribute type, stratum, transition group and age range is then assigned a numeric value using the Transition Attribute Values property; this value is then used as a multiplier on the area undergoing transitions in order to calculate the corresponding value for each attribute. The transition attribute values are provided for each scenario so that users can vary the way in which attributes are calculated between scenarios.


The fields for the Transition Attribute Values property are:

Transition Attribute Type

The state attribute type for which the record applies.

Primary Stratum (optional)

The primary stratum (Vegetation Type by default) for which the record applies. If left blank then the record applies to all primary strata.

Secondary Stratum (optional)

The secondary stratum (Planning Zone by default) for which the record applies. If left blank then the record applies to all secondary strata.

Iteration (optional)

The iteration for which the record applies. If left blank then the record applies to all iterations.

Timestep (optional)

The timestep for which the attribute record applies. If left blank then the attribute record applies to all timesteps. An attribute record continues through time until another Timestep value is encountered by the model for the same state attribute type in the same stratum, at which point the new attribute value will be applied.

Transition Group

The transition group for which the record applies.

State Class (optional)

The state class for which the record applies.

Age Min (optional)

The minimum age for which the record applies.

Age Max (optional)

The maximum age for which the record applies.

Value

The value (per unit area) to be used when calculating the state attribute for this combination of stratum, state class and age range.

Transition Attribute Targets

The Transition Attribute Targets property allows users to define targets for transition attributes over time across the landscape. The steps required to setup these values are typically as follows:

  1. Decide upon the transition attributes for which you wish to set targets
  2. Create a set of records in the Transition Attribute Targets grid for the first timestep of your model run for which you wish to have a target. There should be one record for every possible combination of Stratum and Transition Attribute for which you would like to set a target for this first timestep. Note that prior to the first timestep in which a target is specified for a particular Stratum/Transition Attribute combination, the model assumes that this Stratum/Transition Attribute has no target. Any Stratum/Transition Attribute combinations for which no records are specified are assumed to have no target.
  3. Enter the Target for each record associated with this timestep. Any targets entered will be applied for this and all subsequent timesteps.
  4. If the targets change over the course of the simulation, repeat steps 2-3 for any additional timesteps. Once a target area is entered for Stratum/Transition Attribute for a new timestep, the model will then apply this same target for that Stratum/Transition Attribute for every subsequent timestep (until a new record for this Stratum/Transition Attribute is encountered for a subsequent timestep). Any Stratum/Transition Attribute combinations for which no record is entered are assumed to have the same value as was set prior to this timestep (including no target value if none was set previously).

The fields and options for Transition Attribute Targets property are:

Primary Stratum (optional)

The stratum (Vegetation Type by default) for which the target applies. If no primary stratum is specified the target is applied across all primary strata.

Secondary Stratum (optional)

The secondary stratum (Planning Zone by default) for which the target applies. If no secondary stratum is specified the target is applied across all secondary strata.

Iteration (optional)

This value represents the iteration in which target area is specified. The target area continues through subsequent iterations until another Iteration value is encountered by the model for the same transition group in the same stratum, at which point the new values for target area will be applied. If no iteration is specified, the target will be applied across all iterations.


Timestep (optional)

This value represents the timestep in which target area is specified. The target area continues through time until another Timestep value is encountered by the model for the same transition group in the same stratum, at which point the new values for target area will be applied. If no timestep is specified, the target will be applied across all timesteps.

Transition Attribute

Represents the transition attribute for which target areas are specified.

Target

The target for the combination of stratum, timestep and transition attribute.

Distribution Type (optional)

When using a probability distribution for targets, users must specify a probability distribution type. At the moment either the Normal or Beta distributions are available for setting targets.

SD (optional)

When using a probability distribution for targets, users must specify a standard deviation value that can be sampled from the specified distribution.


Target Min (optional)

When using a probability distribution for targets, users can specify a minimum value that can be sampled from a specified distribution.

Target Max (optional)

When using a probability distribution for targets, users can specify a maximum value that can be sampled from a specified distribution.

Attribute Target Prioritization

The Attribute Target Prioritization property allows users to define how Attribute Targets should be prioritized among strata, state classes and transition groups over time across the landscape for certain Attributes. In order for this property to be useful there must be corresponding Attribute Targets for the Transition Attribute being prioritized. The steps required to setup these values are typically as follows:

  1. Create a Attribute Targets for a Transition Attribute
  2. Decide how you would like that target to be prioritized. For example, you may chose to decide that specific state classes or strata should be prioritized for achieving that Attribute Target.
  3. Create a set of records ordered according to priority with 1 being the highest priority. For example, you may have a number of records representing the different possible state class and stratum combinations along with their priority values. Note that if not all possible combinations are included, those combinations that are missing will be given the lowest priority.

The fields and options for Attribute Target Prioritization property are:

Iteration (optional)

This value represents the iteration in which target priority is specified. The target priority continues through subsequent iterations until another Iteration value is encountered by the model for the same transition group in the same set of conditions, at which point the new values for priority area will be applied. If no iteration is specified, the priority will be applied across all iterations.


Timestep (optional)

This value represents the timestep in which target priority is specified. The target priority continues through time until another Timestep value is encountered by the model for the same transition group in the same set of conditions, at which point the new values for target priority will be applied. If no timestep is specified, the priority will be applied across all timesteps.

Transition Attribute

Represents the transition attribute for which target priorities are specified.

Primary Stratum (optional)

The stratum (Vegetation Type by default) for which the target priority applies. If no primary stratum is specified the priority is applied across all primary strata.

Secondary Stratum (optional)

The secondary stratum (Planning Zone by default) for which the target priority applies. If no secondary stratum is specified the target priority is applied across all secondary strata.

Tertiary Stratum (optional)

The tertiary stratum for which the target priority applies. If no tertiary stratum is specified the target priority is applied across all tertiary strata.

Transition Group (optional)

Represents the transition group for which target priorities are specified.

State Class (optional)

The state class for which the target priority applies. If no state class is specified the target priority is applied across all state classes.

Priority

The priority for the specified combination of strata, and state class. Note that smaller values, are higher priority.