Using the Live Ortho Preview window

The Live Ortho Preview window displays a full-resolution preview of the images orthorectified using the active digital elevation model (DEM), in which you can view changes in finer detail. When you apply changes to the DEM, the ortho images are regenerated automatically, and the preview displays an accurate depiction of how the changes affect images orthorectified using the updated DEM.

The following table describes the toolbar buttons in the Live Ortho Preview window.

Button	Label	Description
	Previous	Go to the previous image associated with the DEM.
	Next	Go to the next image associated with the DEM.
	Vector Editing Toolbar	Display the Focus vector-editing toolbar, which you can use to modify polygon masks. For more information, see About the Vector Editing toolbar.
	New Polygon	Draw a new polygon to use as a mask.
	View DEM Editing Polygons	Switch the visibility of existing DEM editing polygons between on and off. You can use the vector-editing tools to modify the polygons in this window.
	Zoom to Overview	Adjust the magnification so that the entire image appears in the viewer.
	Zoom Interactive	Drag a rectangle over the area you want to magnify.
	Zoom In	Increase the magnification incrementally, centered on the cursor. You can also: Rotate the wheel button forward. To increment the zoom by a factor of two, hold down the Ctrl key, and then rotate the wheel button forward. Click a location or feature in the image, and then press Page Up.
	Zoom Out	Decrease the magnification incrementally, centered on the cursor. You can also: Rotate the wheel button backward. To increment the zoom by a factor of two, hold down the Ctrl key, and then rotate the wheel button backward. Click a location or feature in the image, and then press Page Down.
	Zoom 1:1	Adjust the magnification so that one screen pixel displays one image pixel, centered on the cursor.
	Pan	Drag the image to view a specific area. You can also: Pan horizontally to the left and right by, while holding down the Shift key, rotating the wheel button forward and backward, respectively. Pan vertically up and down by, while holding down the Alt key, rotating the wheel button forward and backward, respectively.
	Pan	Drag the image to view a specific area. You can also: Pan horizontally to the left and right by, while holding down the Shift key, rotating the wheel button forward and backward, respectively. Pan vertically up and down by, while holding down the Alt key, rotating the wheel button forward and backward, respectively.
	Contrast	Adjust the difference between the light and dark extremes for all images displayed. Click the arrow for a menu of additional options.
	Brightness	Adjust the overall luminosity (amount of light) for all images displayed. Click the arrow for a menu of additional options.
	Status Bar	Displays system messages, zoom-image pixel, and current position of the cursor. Click the arrow beside the message field to select which fields to display. Click the arrow beside the cursor-position field to specify the coordinate system.