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Viewer Preferences

To access the Viewer Preferences, click Options > Preferences, and then select the Viewer tab. This will allow you to alter a number of settings related to how the Viewer displays.

The Appearance region controls the overall visual presentation of the Viewer.

• When the Use large button icons is checked, the toolbuttons along the top of the Viewer will be enlarged.
• The other visual elements of the viewer display may be customized by using the Default background color, Highlighter appearance, Region of interest appearance in the Overview Map and Default Elevation Shader buttons. This will not affect the Viewer displays inside the Georeferencer and Transformation Area tools.

The Behavior region controls whether or not the Viewer will maintain loaded data when it is closed. If the option is disabled, the Viewer will preserve currently loaded data, even if the user closes the Viewer window. If the option is enabled, closing the Viewer will clear out all loaded data. Note that quitting the Geographic Calculator will also clear the currently loaded Viewer data.

The Navigation region allows the user to control the Zoom factor in the Viewer display. For example, with the default of 2, when the user selects the Zoom In toolbutton and clicks on the image, it will be doubled in size (enlarged by a factor of 2). If the user selects the Zoom Out toolbutton and clicks on the image, it will be halved (reduced by a factor of 2).

The Selection Behavior region allows the user to control the behavior of the various Selection tools in the viewer, such as Select with Point, Select with Circle and Select with Rectangle

• The Selection aperture controls how close an object needs to be to the selection tool, in order to be selected. With the default value of 10 pixels, any item within 10 pixels of the Select with Point tool will be selected when the user clicks the mouse. If the aperture was increased, objects even further away from the location of the selection tool would be included.
  
• If the Selection Method is set to Select by intersection, then when the user draws a selection circle or rectangle, all items that intersect it will be selected. If Select by containment is chosen, only items entirely contained within the selection circle or rectangle will be selected.

The Feature Calculations region allows the user to control certain calculations applied to selected features. If this option is enabled, when a user selects a feature (as described above) there will be additional data provided in the Selected Features Window, such as the Area, Perimeter, and/or Length (depending on the type of the feature). If the option is disabled, this data will not display. Setting the Calculation results units determines what unit is used to display the calculated values.

The Metadata region allows the user to set a default style sheet to be used in the display of any metadata associated with the file being viewed. The default style sheet will be listed in the Xsl File field of the MetadataWindow.