Disturbance: Define Disturbed Areas

General

The purpose of this set of optional screens is to identify where and when future disturbances are expected to occur. This information is combined with the susceptibility data to predict weed spread (some vegetation types are susceptible to weed invasions only following a disturbance). If the user does not include the disturbance layer, the solver will assume by default that the whole study area is disturbed for the entire planning horizon.

The first screen displayed is used to access previously entered disturbance data using alternative methods:

Screen Items

Load dBase from file: Use to select a database table that was previously developed for another project. The Disturbance screen (shown below) is then displayed.
Load dBase from Map: Use to select a database table that was previously added to the map document. The Disturbance: Define Disturbed Areas screen (shown below) is then displayed.

Disturbance Layer

If you want to create one based on the information in the Disturbance layer:

Select Disturbance Year Field: Select the field name storing the disturbance year in the attribute table in the Disturbance Layer.
Select Duration of Disturbance Field: Select the field name storing the duration of disturbance in the attribute table in the Disturbance Layer.
Continue…: Click when the Disturbance Year and Duration of Disturbance field names have been specified. The Disturbance screen (shown below) is then displayed.

I do not want to consider the Disturbance Layer:

If you do not want WTP to consider the Disturbance Layer, the click the No Disturbance button. In the case that the user does not include the disturbance layer, the model will assume by default that the whole study area is disturbed for the entire planning horizon.

If a Disturbance Layer was specified by any of the available methods in the previous screen, the Disturbance: Define Disturbed Areas screen is displayed:

This screen is used to specify the location and years when an expected future disturbance affects susceptibility of weed spread. These locations and years of susceptibility due to disturbance are identified by 'X'.

Screen Items

ID: Is the GIS identifier for a location.
P1, P2….P10: P1 represents year 1 of the analysis period, P2 represents year 2 and so on to year 10.