Symbolization Tool Menu

• Symbolize Response Theme
• Load RBF File
• Graduated Colour Tool
• Cumulative Area vs. Probability
• Shade Confidence
• Apply Mask

A set of symbolization scripts have been included in Arc-WofE. The are attached to tools and organized in a tool menu that is loaded to the far right position in the View document tool bar.

General instructions for using the symbolization tools.

1. Make the theme that you want to process active. The tools will only be applied to the first active theme, if there is more than one.

2. Select the tool you want to use from the tool menu. If the tool cannot be applied to the active theme, it will be disabled (grayed out).

3. After selecting the tool, click the display area of the View interface to execute the script.

The Tools

Symbolize Response Theme – enabled when a response theme is active.

Description: Symbolizes the response theme based on one of the following values: Posterior Probability, Posterior Logits, Sum of Weights, Uncertainty; Missing Data; Total Uncertainty, using a natural breaks classification.

How to use: Follow the general instructions, preceding. When prompted, select the field you want to symbolize from the dialog that appears, then click 'OK'.

Load RGB File – enabled when a grid or polygon theme is active.

Description: Reads RGB values from a comma delimited text file and applies them to classifications in the active theme.

How to use: Set the number and type of classifications for a theme. Make the theme active, select the Load RGB File tool and click the display area. Select your RGB file from the file dialog and click 'OK'.

RGB file format: text file with one set of RGB values on each line, separated by commas.

Graduated Colour Tool – enabled when a grid or polygon theme is active.

Description: Applies a graduated colour palette to a theme, one colour for each class value in the specified field.

How to use: Follow the general instructions in the first section. If prompted, select a field containing values to symbolize. Again if prompted, select a field with text to use as legend labels.

Cumulative Area vs. Probablity – enabled when a response theme is active.

Description: Reads the areas and posterior probabilities from the attribute table of a response theme. Creates a new table (default name is freq<#>.dbf) and writes the cumulative areas and corresponding probabilities. Then creates an XY chart of the table values. The table can be opened in software other than ArcView, that reads the dBase file format, to create a more complex chart.

How to use: Follow the general symbolization tool instructions. The chart will displayed when processing is complete.

Shade Confidence – enabled when a response theme is active.

Description: Creates a polygon confidence theme, i.e. a theme symbolizes the posterior probability normalized, or divided, by the total uncertainty. The theme is classified using five natural breaks classifications. Each classification is shaded using a dot stipple and transparent background. The theme is meant to be displayed over the response theme from which it was derived. The lower the confidence, the more grayed out or shaded the underlying probability will appear.

The shaded theme is based on a new shape file named Conf<#>.shp.

How to use: follow the general symbolization tool instructions.

Apply Mask – enabled when a response theme is active.

Description: Makes a copy of an active response theme and symbolizes the copy so that all areas with posterior probability values less than or equal to the prior probability are set to a flat gray, and all areas with posterior probability values greater than the prior are made transparent. The theme is intended to be displayed over the response theme from which it was derived, revealing only areas of interest.

How to use: Follow the general symbolization tool instructions.